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(Document certified by Superintendent of Documents <[email protected]>) Signed by Superintendent of Documents <[email protected]> Time: 2010.12.30 03:10:25 -05'00' Reason: GPO attests that this document has not been altered since it was disseminated by GPO Location: US GPO, Washington, DC 20401
� 83.19 

(e) A new designation of the Secretary 
under this section will take effect 
30 calendar days after the date on 
which the report of the Secretary 
under paragraph (d) of this section is 
submitted to Congress, unless Congress 
takes an action that reverses or expedites 
the designation. Such new designations 
and related congressional actions 
will be further reported by the 
Secretary pursuant to paragraphs (d) 
and (e) of � 83.17. 
[70 FR 75953, Dec. 22, 2005] 

� 83.19 How can the Secretary cancelor modify a final decision to add aclass of employees to the Cohort? 

(a) The Secretary can cancel a final 
decision to add a class to the Cohort, 
or can modify a final decision to reduce 
the scope of a class added by the Secretary, 
if HHS obtains records relevant 
to radiation exposures of members of 
the class that enable NIOSH to estimate 
the radiation doses incurred by 
individual members of the class 
through dose reconstructions conducted 
under the requirements of 42 
CFR part 82. 
(b) Before canceling a final decision 
to add a class or modifying a final decision 
to reduce the scope of a class, the 
Secretary intends to follow evaluation 
procedures that are substantially similar 
to those described in this part for 
adding a class of employees to the Cohort. 
The procedures will include the 
following: 
(1) Publication of a notice in the FEDERAL 
REGISTER informing the public of 
the intent of the Secretary to review 
the final decision on the basis of new 
information and describing procedures 
for this review; 
(2) An analysis by NIOSH of the utility 
of the new information for conducting 
dose reconstructions under 42 
CFR part 82; the analysis will be performed 
consistently with the requirements 
for analysis of a petition by 
NIOSH under �� 83.13(c)(1) and (2), and 
83.13(c)(2) and (3); 
(3) A recommendation by the Board 
to the Secretary as to whether or not 
the Secretary should cancel or modify 
his final decision that added the class 
to the Cohort, based upon a review by 
the Board of the NIOSH analysis under 
paragraph (b)(2) of this section and any 
42 CFR Ch. I (10�1�10 Edition) 

other relevant information considered 
by the Board; 

(4) An opportunity for members of 
the class to contest a proposed decision 
to cancel or modify the prior final decision 
that added the class to the Cohort, 
including a reasonable and timely effort 
by the Secretary to notify members 
of the class of this opportunity; 
and 
(5) Publication in the FEDERAL REGISTER 
of a final decision to cancel or 
modify the prior final decision that 
added the class to the Cohort. 
[69 FR 30780, May 28, 2004. Redesignated at 70 
FR 75953, Dec. 22, 2005] 

PART 84�APPROVAL OF 
RESPIRATORY PROTECTIVE DEVICES 

Subpart A�General Provisions 

Sec. 

84.1 Purpose. 
84.2 Definitions. 
84.3 
Respirators for mine rescue or other 
emergency use in mines. 
Subpart B�Application for Approval 

84.10 Application procedures. 
84.11 Contents of application. 
84.12 
Delivery of respirators and components 
by applicant; requirements. 
Subpart C�Fees 

84.20 
Examination, inspection, and testing 
of complete respirator assemblies; fees. 
84.21 
Examination, inspection, and testing 
of respirator components or subassemblies; 
fees. 
84.22 
Unlisted fees; additional fees; payment 
by applicant prior to approval. 
Subpart D�Approval and Disapproval 

84.30 
Certificates of approval; scope of approval. 
84.31 Certificates of approval; contents. 
84.32 Notice of disapproval. 
84.33 
Approval labels and markings; approval 
of contents; use. 
84.34 Revocation of certificates of approval. 
84.35 
Changes or modifications of approved 
respirators; issuance of modification of 
certificate of approval. 
84.36 
Delivery of changed or modified approved 
respirator. 
Subpart E�Quality Control 

84.40 
Quality control plans; filing requirements. 
84.41 Quality control plans; contents. 
542 




Public Health Service, HHS 

84.42 
Proposed quality control plans; approval 
by the Institute. 
84.43 
Quality control records; review by the 
Institute; revocation of approval. 
Subpart F�Classification of Approved Respirators; 
Scope of Approval; Atmospheric 
Hazards; Service Time 

84.50 
Types of respirators to be approved; 
scope of approval. 
84.51 
Entry and escape, or escape only; classification. 
84.52 Respiratory hazards; classification. 
84.53 Service time; classification. 
Subpart G�General Construction and 
Performance Requirements 


84.60 
Construction and performance requirements; 
general. 
84.61 General construction requirements. 
84.62 
Component parts; minimum requirements. 
84.63 Test requirements; general. 
84.64 
Pretesting by applicant; approval of 
test methods. 
84.65 
Conduct of examinations, inspections, 
and tests by the Institute; assistance by 
applicant; observers; recorded data; public 
demonstrations. 
84.66 
Withdrawal of applications; refund of 
fees. 
Subpart H�Self-Contained Breathing 
Apparatus 


84.70 
Self-contained breathing apparatus; 
description. 
84.71 
Self-contained breathing apparatus; 
required components. 
84.72 
Breathing tubes; minimum requirements. 
84.73 
Harnesses; installation and construction; 
minimum requirements. 
84.74 
Apparatus containers; minimum requirements. 
84.75 
Half-mask facepieces, full facepieces, 
mouthpieces; fit; minimum requirements. 
84.76 
Facepieces; eyepieces; minimum requirements. 
84.77 
Inhalation and exhalation valves; minimum 
requirements. 
84.78 
Head harnesses; minimum requirements. 
84.79 
Breathing gas; minimum requirements. 
84.80 
Interchangeability of oxygen and air 
prohibited. 
84.81 
Compressed breathing gas and liquefied 
breathing gas containers; minimum 
requirements. 
84.82 
Gas pressure gages; minimum requirements. 
Pt. 84 

84.83 
Timers; elapsed time indicators; remaining 
service life indicators; minimum 
requirements. 
84.84 
Hand-operated valves; minimum requirements. 
84.85 
Breathing bags; minimum requirements. 
84.86 
Component parts exposed to oxygen 
pressures; minimum requirements. 
84.87 
Compressed gas filters; minimum requirements. 
84.88 Breathing bag test. 
84.89 Weight requirement. 
84.90 Breathing resistance test; inhalation. 
84.91 Breathing resistance test; exhalation. 
84.92 Exhalation valve leakage test. 
84.93 Gas flow test; open-circuit apparatus. 
84.94 
Gas flow test; closed-circuit apparatus. 
84.95 
Service time test; open-circuit apparatus. 
84.96 
Service time test; closed-circuit apparatus. 
84.97 
Test for carbon dioxide in inspired gas; 
open- and closed-circuit apparatus; maximum 
allowable limits. 
84.98 
Tests during low temperature operation. 
84.99 
Man tests; testing conditions; general 
requirements. 
84.100 Man tests 1, 2, 3, and 4; requirements. 
84.101 Man test 5; requirements. 
84.102 Man test 6; requirements. 
84.103 Man tests; performance requirements. 
84.104 Gas tightness test; minimum requirements. 
TABLES TO SUBPART H OF PART 84 

Subpart I�Gas Masks 

84.110 Gas masks; description. 
84.111 Gas masks; required components. 
84.112 
Canisters and cartridges in parallel; 
resistance requirements. 
84.113 
Canisters and cartridges; color and 
markings; requirements. 
84.114 
Filters used with canisters and cartridges; 
location; replacement. 
84.115 
Breathing tubes; minimum requirements. 
84.116 
Harnesses; installation and construction; 
minimum requirements. 
84.117 
Gas mask containers; minimum requirements. 
84.118 
Half-mask facepieces, full facepieces, 
and mouthpieces; fit; minimum requirements. 
84.119 
Facepieces; eyepieces; minimum requirements. 
84.120 
Inhalation and exhalation valves; 
minimum requirements. 
84.121 
Head harnesses; minimum requirements. 
84.122 
Breathing resistance test; minimum 
requirements. 
84.123 Exhalation valve leakage test. 
543 




Pt. 84 

84.124 
Facepiece tests; minimum requirements. 
84.125 
Particulate tests; canisters containing 
particulate filters; minimum requirements. 
84.126 Canister bench tests; minimum requirements. 
TABLES TO SUBPART I OF PART 84 

Subpart J�Supplied-Air Respirators 

84.130 Supplied-air respirators; description. 
84.131 
Supplied-air respirators; required 
components. 
84.132 
Breathing tubes; minimum requirements. 
84.133 
Harnesses; installation and construction; 
minimum requirements. 
84.134 
Respirator containers; minimum requirements. 
84.135 
Half-mask facepieces, full facepieces, 
hoods, and helmets; fit; minimum requirements. 
84.136 
Facepieces, hoods, and helmets; eyepieces; 
minimum requirements. 
84.137 
Inhalation and exhalation valves; 
check valves; minimum requirements. 
84.138 
Head harnesses; minimum requirements. 
84.139 
Head and neck protection; supplied-
air respirators; minimum requirements. 
84.140 
Air velocity and noise levels; hoods 
and helmets; minimum requirements. 
84.141 
Breathing gas; minimum requirements. 
84.142 
Air supply source; hand-operated or 
motor driven air blowers; Type A sup-
plied-air respirators; minimum requirements. 
84.143 
Terminal fittings or chambers; Type 
B supplied-air respirators; minimum requirements. 
84.144 
Hand-operated blower test; minimum 
requirements. 
84.145 
Motor-operated blower test; minimum 
requirements. 
84.146 
Method of measuring the power and 
torque required to operate blowers. 
84.147 
Type B supplied-air respirator; minimum 
requirements. 
84.148 
Type C supplied-air respirator, con-
tinuous-flow class; minimum requirements. 
84.149 
Type C supplied-air respirator, demand 
and pressure demand class; minimum 
requirements. 
84.150 
Air-supply line tests; minimum requirements. 
84.151 Harness test; minimum requirements. 
84.152 
Breathing tube test; minimum requirements. 
84.153 
Airflow resistance test, Type A and 
Type AE supplied-air respirators; minimum 
requirements. 
84.154 
Airflow resistance test; Type B and 
Type BE supplied-air respirators; minimum 
requirements. 
42 CFR Ch. I (10�1�10 Edition) 

84.155 
Airflow resistance test; Type C sup-
plied-air respirator, continuous flow 
class and Type CE supplied-air respirator; 
minimum requirements. 
84.156 
Airflow resistance test; Type C sup-
plied-air respirator, demand class; minimum 
requirements. 
84.157 
Airflow resistance test; Type C sup-
plied-air respirator, pressure-demand 
class; minimum requirements. 
84.158 Exhalation valve leakage test. 
84.159 
Man tests for gases and vapors; sup-
plied-air respirators; general performance 
requirements. 
84.160 
Man test for gases and vapors; Type A 
and Type AE respirators; test requirements. 
84.161 
Man tests for gases and vapors; Type 
B and Type BE respirators; test requirements. 
84.162 
Man test for gases and vapors; Type C 
respirators, continuous-flow class and 
Type CE supplied-air respirators; test requirements. 
84.163 
Man test for gases and vapors; Type C 
supplied-air respirators, demand and 
pressure-demand classes; test requirements. 
TABLES TO SUBPART J OF PART 84 

Subpart K�Non-Powered Air-Purifying 
Particulate Respirators 


84.170 
Non-powered air-purifying particulate 
respirators; description. 
84.171 
Non-powered air-purifying particulate 
respirators; required components. 
84.172 
Breathing tubes; minimum requirements. 
84.173 
Harnesses; installation and construction; 
minimum requirements. 
84.174 
Respirator containers; minimum requirements. 
84.175 
Half-mask facepieces, full facepieces, 
hoods, helmets, and mouthpieces; fit; 
minimum requirements. 
84.176 
Facepieces, hoods, and helmets; eyepieces; 
minimum requirements. 
84.177 
Inhalation and exhalation valves; 
minimum requirements. 
84.178 
Head harnesses; minimum requirements. 
84.179 
Non-powered air-purifying particulate 
respirators; filter identification. 
84.180 Airflow resistance tests. 
84.181 
Non-powered air-purifying particulate 
filter efficiency level determination. 
84.182 
Exhalation valve leakage test; minimum 
requirements. 
Subpart L�Chemical Cartridge Respirators 

84.190 
Chemical cartridge respirators: description. 
84.191 
Chemical cartridge respirators; required 
components. 
544 




Public Health Service, HHS 

84.192 
Cartridges in parallel; resistance requirements. 
84.193 
Cartridges; color and markings; requirements. 
84.194 
Filters used with chemical cartridges; 
location; replacement. 
84.195 
Breathing tubes; minimum requirements. 
84.196 
Harnesses; installation and construction; 
minimum requirements. 
84.197 
Respirator containers; minimum requirements. 
84.198 
Half-mask facepieces, full facepieces, 
mouthpieces, hoods, and helmets; fit; 
minimum requirements. 
84.199 
Facepieces, hoods, and helmets; eyepieces; 
minimum requirements. 
84.200 
Inhalation and exhalation valves; 
minimum requirements. 
84.201 
Head harnesses; minimum requirements. 
84.202 
Air velocity and noise levels; hoods 
and helmets; minimum requirements. 
84.203 
Breathing resistance test; minimum 
requirements. 
84.204 
Exhalation valve leakage test; minimum 
requirements. 
84.205 
Facepiece test; minimum requirements. 
84.206 
Particulate tests; respirators with filters; 
minimum requirements; general. 
84.207 Bench tests; gas and vapor tests; minimum 
requirements; general. 
TABLES TO SUBPART L OF PART 84 

Subpart M [Reserved] 

Subpart N�Special Use Respirators 

84.250 
Vinyl chloride respirators; description. 
84.251 Required components. 
84.252 Gas masks; requirements and tests. 
84.253 
Chemical-cartridge respirators; requirements 
and tests. 
84.254 
Powered air-purifying respirators; requirements 
and tests. 
84.255 
Requirements for end-of-service-life 
indicator. 
84.256 Quality control requirements. 
84.257 Labeling requirements. 
84.258 Fees. 
Subparts O�JJ [Reserved] 

Subpart KK�Dust, Fume, and Mist; Pesticide; 
Paint Spray; Powered Air-Purifying 
High Efficiency Respirators and 
Combination Gas Masks 

84.1100 Scope and effective dates. 

84.1101 Definitions. 

84.1102 Examination, inspection and testing 
of complete respirator assemblies; fees. 

84.1103 Approval labels and markings; approval 
of contents; use. 

84.1130 Respirators; description. 

Pt. 84 

84.1131 Respirators; required components. 

84.1132 Breathing tubes; minimum requirements. 


84.1133 Harnesses; installation and construction; 
minimum requirements. 

84.1134 Respirator containers; minimum requirements. 


84.1135 Half-mask facepieces, full facepieces, 
hoods, helmets, and mouthpieces; fit; 
minimum requirements. 

84.1136 Facepieces, hoods, and helmets; eyepieces; 
minimum requirements. 

84.1137 Inhalation and exhalation valves; 
minimum requirements. 

84.1138 Head harnesses; minimum requirements. 


84.1139 Air velocity and noise levels; hoods 
and helmets; minimum requirements. 

84.1140 Dust, fume, and mist respirators; 
performance requirements; general. 

84.1141 Isoamyl acetate tightness test; dust, 
fume, and mist respirators designed for 
respiratory protection against fumes of 
various metals having an air contamination 
level not less than 0.05 milligram 
per cubic meter; minimum requirements. 

84.1142 Isoamyl acetate tightness test; respirators 
designed for respiratory protection 
against dusts, fumes, and mists having 
an air contamination level less than 

0.05 milligram per cubic meter, or 
against radionuclides; minimum requirements. 
84.1143 Dust, fume, and mist air-purifying 
filter tests; performance requirements; 
general. 

84.1144 Silica dust test for dust, fume, and 
mist respirators; single-use or reusable 
filters; minimum requirements. 

84.1145 Silica dust test; non-powered single-
use dust respirators; minimum requirements. 


84.1146 Lead fume test for dust, fume, and 
mist respirators; minimum requirements. 


84.1147 Silica mist test for dust, fume, and 
mist respirators; minimum requirements. 


84.1148 Tests for respirators designed for 
respiratory protection against more than 
one type of dispersoid; minimum requirements. 


84.1149 Airflow resistance tests; all dust, 
fume, and mist respirators; minimum requirements. 


84.1150 Exhalation valve leakage test; minimum 
requirements. 

84.1151 DOP filter test; respirators designed 
as respiratory protection against dusts, 
fumes, and mists having an air contamination 
level less than 0.05 milligram per 
cubic meter and against radionuclides; 
minimum requirements. 

84.1152 
Silica dust loading test; respirators 
designed as protection against dusts, 
fumes, and mists having an air contamination 
level less than 0.05 milligram per 

545 




� 84.1 

cubic meter and against radionuclides; 
minimum requirements. 

84.1153 Dust, fume, mist, and smoke tests; 
canister bench tests; gas mask canisters 
containing filters; minimum requirements. 


84.1154 Canister and cartridge requirements. 
84.1155 Filters used with canisters and cartridges; 
location; replacement. 
84.1156 Pesticide respirators; performance 
requirements; general. 

84.1157 Chemical cartridge respirators with 
particulate filters; performance requirements; 
general. 

84.1158 Dust, fume, and mist tests; respirators 
with filters; minimum requirements; 
general. 

TABLES TO SUBPART KK OF PART 84 

AUTHORITY: 29 U.S.C. 577a, 651 et seq., and 
657(g); 30 U.S.C. 3, 5, 7, 811, 842(h), 844. 

SOURCE: 60 FR 30355, June 8, 1995, unless 
otherwise noted. 

EDITORIAL NOTE: Nomenclature changes to 
part 84 appear at 69 FR 18803, Apr. 9, 2004. 

Subpart A�General Provisions 

� 84.1 Purpose. 

The purpose of the regulations contained 
in this part 84 is: 

(a) To establish procedures and prescribe 
requirements which must be met 
in filing applications for approval by 
the National Institute for Occupational 
Safety and Health of respirators or 
changes or modifications of approved 
respirators; 
(b) To establish a schedule of fees to 
be charged each applicant for the inspections, 
examinations, and testing 
conducted by the Institute under the 
provisions of this part; 
(c) To provide for the issuance of certificates 
of approval or modifications 
of certificates of approval for respirators 
which have met the applicable 
construction, performance, and respiratory 
protection requirements set 
forth in this part; and 
(d) To specify minimum requirements 
and to prescribe methods to be 
employed by the Institute and by the 
applicant in conducting inspections, 
examinations, and tests to determine 
the effectiveness of respirators used 
during entry into or escape from hazardous 
atmospheres. 
� 84.2 Definitions. 

As used in this part� 

42 CFR Ch. I (10�1�10 Edition) 

(a) Applicant means an individual, 
partnership, company, corporation, association, 
or other organization that 
designs, manufactures, assembles, or 
controls the assembly of a respirator 
and who seeks to obtain a certificate of 
approval for such respirator. 
(b) Approval means a certificate or 
formal document issued by the Institute 
stating that an individual respirator 
or combination of respirators 
has met the minimum requirements of 
this part, and that the applicant is authorized 
to use and attach an approval 
label to any respirator, respirator container, 
or instruction card for any respirator 
manufactured or assembled in 
conformance with the plans and specifications 
upon which the approval was 
based, as evidence of such approval. 
(c) Approved means conforming to the 
minimum requirements of this part. 
(d) Auxiliary equipment means a self-
contained breathing apparatus, the use 
of which is limited in underground 
mine rescue and recovery operations to 
situations where the wearer has ready 
access to fresh air and at least one 
crew equipped with approved self-contained 
breathing apparatus of 2 hours 
or longer rating, is in reserve at a 
fresh-air base. 
(e) Certification and Quality Assurance 
Branch means the Certification and 
Quality Assurance Branch, Division of 
Safety Research, Appalachian Laboratory 
for Occupational Safety and 
Health, National Institute for Occupational 
Safety and Health, 1095 
Willowdale Road, Morgantown, West 
Virginia 26505�2888. 
(f) Compressed-breathing gas means oxygen 
or air stored in a compressed 
state and supplied to the wearer in gaseous 
form. 
(g) dBA means sound pressure levels 
in decibels, as measured with the A-
weighted network of a standard sound 
level meter using slow response. 
(h) Dust means a solid mechanically 
produced particle with a size ranging 
from submicroscopic to macroscopic. 
(i) Respirators for entry into and escape 
from means respiratory devices providing 
protection during entry into and 
escape from hazardous atmospheres. 
546 




Public Health Service, HHS 

(j) Respirators for escape only means 
respiratory devices providing protection 
only during escape from hazardous 
atmospheres. 
(k) A facepiece or mouthpiece is a respirator 
component designed to provide 
a gas-tight or dust-tight fit with the 
face and may include headbands, 
valves, and connections for canisters, 
cartridges, filters, or respirable gas 
source. 
(l) Final inspection means that activity 
carried out on a product after all 
manufacturing and assembly operations 
are completed to insure completeness 
and adherence to performance 
or other specifications, including 
satisfactory appearance. 
(m) Fume means a solid condensation 
particle, generally less than 1 micrometer 
in diameter. 
(n) Gas means an aeriform fluid 
which is in a gaseous state at ordinary 
temperature and pressure. 
(o) Hazardous atmosphere means: 
(1) Any atmosphere containing a 
toxic or disease producing gas, vapor, 
dust, fume, mist, or pesticide, either 
immediately or not immediately dangerous 
to life or health; or 
(2) Any oxygen-deficient atmosphere. 
(p) A hood or helmet is a respirator 
component which covers the wearer�s 
head and neck, or head, neck, and 
shoulders, and is supplied with incoming 
respirable air for the wearer to 
breathe. It may include a headharness 
and connection for a breathing tube. 
(q) Immediately dangerous to life or 
health means conditions that pose an 
immediate threat to life or health or 
conditions that pose an immediate 
threat of severe exposure to contaminants, 
such as radioactive materials, 
which are likely to have adverse cumulative 
or delayed effects on health. 
(r) Incoming inspection means the activity 
of receiving, examining, and accepting 
only those materials and parts 
whose quality conforms to specification 
requirements. 
(s) In-process inspection means the 
control of products at the source of 
production and at each step of the 
manufacturing process, so that departures 
from specifications can be corrected 
before defective components or 
materials are assembled into the finished 
product. 
� 84.3 

(t) Institute means the National Institute 
for Occupational Safety and 
Health, Department of Health and 
Human Services. 

(u) Liquefied-breathing gas means oxygen 
or air stored in liquid form and 
supplied to the wearer in a gaseous 
form. 
(v) Mist means a liquid condensation 
particle with a size ranging from submicroscopic 
to macroscopic. 
(w) MSHA means the Mine Safety and 
Health Administration, U.S. Department 
of Labor. 
(x) Not immediately dangerous to life or 
health means any hazardous atmosphere 
which may produce physical discomfort 
immediately, chronic poisoning 
after repeated exposure, or 
acute adverse physiological symptoms 
after prolonged exposure. 
(y) Oxygen-deficient atmosphere means 
an atmosphere which contains an oxygen 
partial pressure of less than 148 
millimeters of mercury (19.5 percent by 
volume at sea level). 
(z) Powered air-purifying respirator 
means a device equipped with a face-
piece, hood, or helmet, breathing tube, 
canister, cartridge, filter, canister with 
filter, or cartridge with filter, and a 
blower. 
(aa) Respirator means any device designed 
to provide the wearer with respiratory 
protection against inhalation 
of a hazardous atmosphere. 

(bb) Single-use respirator means a respirator 
that is entirely discarded after 
excessive resistance, sorbent exhaustion, 
or physical damage renders it unsuitable 
for further use. 

(cc) Vapor means the gaseous state of 
a substance that is solid or liquid at ordinary 
temperature and pressure. 
� 84.3 Respirators for mine rescue or 
other emergency use in mines. 

(a)(1) NIOSH and the Mine Safety and 
Health Administration (MSHA), U.S. 
Department of Labor, shall jointly review 
and issue certifications for respirators 
used for mine emergencies and 
mine rescue, including any associated 
service-life plans, users� manuals and 
other supporting documentation. 

(2) Each certification for a respirator 
designed for mine rescue or other 
emergency use in mines shall include, 
547 




� 84.10 

as a condition of approval, any use limitations 
related to mine safety and 
health. 

(b) NIOSH and MSHA shall jointly 
determine appropriate recall and retrofit 
remedies for field complaints or 
identified deficiencies involving any 
respirators used in the mining environment. 
Subpart B�Application for 
Approval 


� 84.10 Application procedures. 

(a) Inspection, examination, and testing 
leading to the approval of the types 
of respirators classified in subpart F of 
this part shall be undertaken by the Institute 
only pursuant to written applications 
which meet the minimum requirements 
set forth in this subpart B. 
(b) Applications shall be submitted to 
the Certification and Quality Assurance 
Branch, and shall be accompanied 
by a check, bank draft, or money order 
in the amount specified in subpart C of 
this part, payable to the order of the 
National Institute for Occupational 
Safety and Health. 
(c) Except as provided in � 84.64, the 
examination, inspection, and testing of 
all respirators shall be conducted by 
the Certification and Quality Assurance 
Branch. 
(d) Applicants, manufacturers, or 
their representatives may visit or communicate 
with the Certification and 
Quality Assurance Branch in order to 
discuss the requirements for approval 
of any respirator or the proposed designs 
thereof. No charge shall be made 
for such consultation and no written 
report shall be issued to applicants, 
manufacturers, or their representatives 
by the Institute as a result of such consultation. 
(e) Respirators having electrical or 
electronic components that are required 
to be permissible under chapter 
I of title 30 shall be tested in accordance 
with 30 CFR part 18. Applications 
for approval of such respirators by 
MSHA shall be submitted in writing to: 
MSHA, Approval and Certification Center, 
Box 251, Industrial Park Road, 
Triadelphia, West Virginia 26059. 
42 CFR Ch. I (10�1�10 Edition) 

� 84.11 Contents of application. 

(a) Each application for approval 
shall contain a complete written description 
of the respirator for which 
approval is requested together with 
drawings and specifications (and lists 
thereof) showing full details of construction 
of the respirator and of the 
materials used. 
(b) Drawings shall be titled, numbered, 
and dated; any revision dates 
shall be shown on the drawings, and 
the purpose of each revision being 
sought shall be shown on the drawing 
or described on an attachment to the 
drawing to which it applies. 
(c) Each application for approval 
shall contain a proposed plan for quality 
control which meets the minimum 
requirements set forth in subpart E of 
this part. 
(d) Each application shall contain a 
statement that the respirator has been 
pretested by the applicant as prescribed 
in � 84.64, and shall include the 
results of such tests. 
(e) Each application for approval 
shall contain a statement that the respirator 
and component parts submitted 
for approval are either prototypes, or 
made on regular production tooling, 
with no operation included which will 
not be incorporated in regular production 
processing. 
(The information collections contained in 
this section are approved under OMB control 
number 0920�0109) 

� 84.12 Delivery of respirators and 
components by applicant; requirements. 


(a) Each applicant shall, when an application 
is filed pursuant to � 84.10, be 
advised by the Institute of the total 
number of respirators and component 
parts required for testing. 
(b) The applicant shall deliver, at his 
own expense, the number of completely 
assembled respirators and component 
parts required for testing, to the Certification 
and Quality Assurance 
Branch. 
(c) Respirators and component parts 
submitted for approval must be made 
from materials specified in the application. 
(d) One completely assembled respirator 
approved under the provisions 
548 




Public Health Service, HHS 

of this part may be retained by the Institute 
as a laboratory exhibit, the remaining 
respirators may be returned to 
the applicant at his own expense, upon 
written request within 30 days after notice 
of approval. If no such request is 
made, the respirators will be disposed 
of by the Institute in such manner as it 
deems appropriate. 

(e) Where a respirator fails to meet 
the requirements for approval set forth 
in this part, all respirators and components 
delivered in accordance with this 
section may be returned to the applicant 
at his own expense, upon written 
request within 30 days after notice of 
disapproval. If no such request is made, 
the respirators will be disposed of by 
the Institute in such manner as it 
deems appropriate. 
Subpart C�Fees 

� 84.20 Examination, inspection, and 

testing of complete respirator as


semblies; fees. 

Except as provided in � 84.22, the following 
fees shall be charged by the Institute 
for the examination, inspection 
and testing of complete respirator assemblies: 


Self-contained breathing apparatus: 

Entry and escape, 1 hour or more ... $3,500 

Entry and escape, less than 1 hour 2,750 

Escape only .................................... 2,000 
Gas masks: 

Single hazard .................................. 1,100 


Type N ............................................ 4,100 
Supplied-air respirators .................... 750 
Particulate respirators ..................... 1,250 
Chemical cartridge respirators ......... 1,150 


� 84.21 Examination, inspection, and 

testing of respirator components or 

subassemblies; fees. 

Except as provided in � 84.22, the following 
fees shall be charged by the Institute 
for the examination, inspection 
and testing of the individual respirator 
components or subassemblies: 

Facepieces ............................................ $450 
Canisters .............................................. 900 
Cartridges ............................................. 600 
Filters .................................................. 650 
Hoses .................................................... 250 
Blowers ................................................. 250 
Harnesses ............................................. 100 


� 84.22 

� 84.22 Unlisted fees; additional fees; 
payment by applicant prior to approval. 


(a) Applications for the examination, 
inspection and testing of complete respirator 
assemblies which are not listed 
in � 84.20, or for the examination, inspection, 
and testing of respirator components 
or subassemblies which are not 
listed in � 84.21, shall be accompanied 
by the following deposits: 
Complete respirator assembly ........... $1,500 
Each individual component or subassembly 
......................................... 500 

(b) The Institute reserves the right to 
conduct any examination, inspection, 
or test it deems necessary to determine 
the quality and effectiveness of any 
listed or unlisted respirator assembly 
or respirator component or subassembly, 
and to assess the cost of 
such examinations, inspections, or 
tests against the applicant prior to the 
issuance of any approval for such assembly, 
component, or subassembly. 
(c) The fees charged for the examination, 
inspection, and testing of unlisted 
respirator assemblies, unlisted individual 
respirator components or subassemblies, 
and for the additional examination, 
inspection, and testing of 
listed respirator assemblies and components 
or subassemblies shall be at the 
rate of $100 per day for each man-day 
required to be expended by the Institute. 
(d) Upon completion of all examinations, 
inspections, and tests of unlisted 
respirator assemblies or components, 
or following the completion of any additional 
examination, inspections, or 
tests of listed assemblies, or components 
or subassemblies, including retesting 
subsequent to disapproval, the 
Institute shall advise the applicant in 
writing of the total cost assessed and 
the additional amount, if any, which 
must be paid to the Institute as a condition 
of approval. 
(e) In the event the amount assessed 
by the Institute for unlisted assemblies, 
or components or subassemblies 
is less than the amount of the deposit 
submitted in accordance with paragraph 
(a) of this section, the Institute 
shall refund the overpayment upon the 
issuance of any approval or notice of 
disapproval. 
549 




� 84.30 

Subpart D�Approval and
Disapproval 


� 84.30 Certificates of approval; scope 
of approval. 

(a) The Institute shall issue certificates 
of approval pursuant to the provisions 
of this subpart only for individual, 
completely assembled respirators 
which have been examined, inspected, 
and tested, and which meet 
the minimum requirements set forth in 
subparts H through L of this part, as 
applicable. 
(b) The Institute will not issue certificates 
of approval for any respirator 
component or for any respirator subassembly. 
(c) The Institute shall not issue an 
informal notification of approval. However, 
if the application for approval, 
submitted in accordance with � 84.11, 
states that the submitted respirator 
and component parts are only prototypes, 
the Institute will examine, inspect, 
and test such respirator and 
component parts in accordance with 
the provisions of this part. If, upon 
completion of such examinations, inspections 
and tests, it is found that the 
prototype meets the minimum requirements 
set forth in this part, the Institute 
may inform the applicant, in writing, 
of the results of the examinations, 
inspections, and tests, and may require 
him to resubmit respirators and component 
parts made on regular production 
tooling, with no operations included 
which will not be incorporated 
in regular production processing, for 
further examination, inspection, and 
testing, prior to issuance of the certificate 
of approval. 
(d) Applicants required to resubmit 
respirators and component parts made 
on regular production tooling, with no 
operation included which will not be 
incorporated in regular production 
processing, shall be charged fees in accordance 
with subpart C of this part. 
� 84.31 Certificates of approval; contents. 


(a) The certificate of approval shall 
contain a classification and a description 
of the respirator or combination of 
respirators for which it is issued, as 
provided in this part. 
42 CFR Ch. I (10�1�10 Edition) 

(b) The certificate of approval shall 
specifically set forth any restrictions 
or limitations on the respirator�s use 
in hazardous atmospheres. 
(c) Each certificate of approval shall 
be accompanied by the drawings and 
specifications (and lists thereof) submitted 
by the applicant in accordance 
with � 84.11. These drawings and specifications 
shall be referenced in the certificate 
of approval, and shall be maintained 
by the applicant. The drawings 
and specifications listed in each certificate 
of approval shall set forth in detail 
the design and construction requirements 
which shall be met by the 
applicant during commercial production 
of the respirator. 
(d) Each certificate of approval shall 
be accompanied by a reproduction of 
the approval label design to be employed 
by the applicant with each approved 
respirator, as provided in � 84.33. 
(e) No test data or specific laboratory 
findings will accompany any certificate 
of approval, however, the Institute 
will release pertinent test data and 
specific findings upon written request 
by the applicant, or as required by 
statute or regulation. 
(f) Each certificate of approval shall 
also contain the approved quality control 
plan as specified in � 84.42. 
� 84.32 Notice of disapproval. 

(a) If, upon the completion of the examinations, 
inspections, and tests required 
to be conducted in accordance 
with the provisions of this part, it is 
found that the respirator does not meet 
the minimum requirements set forth in 
this part, the Institute shall issue a 
written notice of disapproval to the applicant. 
(b) Each notice of disapproval shall 
be accompanied by all pertinent data 
or findings with respect to the defects 
of the respirator for which approval 
was sought with a view to the possible 
correction of any such defects. 
(c) The Institute shall not disclose, 
except to the applicant or as required 
by statute or regulation, any data, 
findings, or other information with respect 
to any respirator for which a notice 
of disapproval is issued. 
550 




Public Health Service, HHS 

� 84.33 Approval labels and markings;
approval of contents; use. 

(a) Full-scale reproductions of approval 
labels and markings, and a 
sketch or description of the method of 
application and position on the harness, 
container, canister, cartridge, filter, 
or other component, together with 
instructions for the use and maintenance 
of the respirator shall be submitted 
to the Institute for approval. 
(b) Approval labels shall bear the emblem 
of the National Institute for Occupational 
Safety and Health and the 
seal of the Department of Health and 
Human Services, the applicant�s name 
and address, an approval number assigned 
by the Institute and, where ap� 
84.35 

propriate, restrictions or limitations 
placed upon the use of the respirator 
by the Institute. The approval number 
assigned by the Institute shall be designated 
by the prefix TC and a serial 
number. 

(c) The Institute shall, where necessary, 
notify the applicant when additional 
labels, markings, or instructions 
will be required. 
(d) Approval labels and markings 
shall only be used by the applicant to 
whom they were issued. 
(e) Legible reproductions or abbreviated 
forms of the label approved by 
the Institute for use on each respirator 
shall be attached to or printed at the 
following locations: 
Respirator type Label type Location 
Self-contained breathing apparatus. 
Gas mask ................................. 
Supplied air respirator .............. 
Particulate respirator ................ 
Chemical-cartridge respirator ... 
Entire ....................................... 
Entire ....................................... 
......do ...................................... 
......do ...................................... 
Abbreviated ............................. 
Entire ....................................... 
Abbreviated ............................. 
Harness assembly and canister (where applicable). 
Mask container and canister. 
Respirator container or instruction card. 
Respirator container and filter container. 
Filters. 
Respirator container, cartridge container, and filter containers 
(where applicable). 
Cartridges and filters and filter containers. 

(f) The use of any Institute approval 
label obligates the applicant to whom 
it is issued to maintain or cause to be 
maintained the approved quality control 
sampling schedule and the acceptable 
quality level for each characteristic 
tested, and to assure that it 
is manufactured according to the drawings 
and specifications upon which the 
certificate of approval is based. 
(g) Each respirator, respirator component, 
and respirator container shall, 
as required by the Institute to assure 
quality control and proper use of the 
respirator, be labeled distinctly to 
show the name of the applicant, and 
the name and letters or numbers by 
which the respirator or respirator component 
is designated for trade purposes, 
and the lot number, serial number, 
or approximate date of manufacture. 
� 84.34 Revocation of certificates of approval. 


The Institute reserves the right to 
revoke, for cause, any certificate of approval 
issued pursuant to the provisions 
of this part. Such causes include, 

but are not limited to, misuse of approval 
labels and markings, misleading 
advertising, and failure to maintain or 
cause to be maintained the quality 
control requirements of the certificate 
of approval. 

� 84.35 Changes or modifications of approved 
respirators; issuance of 
modification of certificate of approval. 


(a) Each applicant may, if he desires 
to change any feature of an approved 
respirator, request a modification of 
the original certificate of approval 
issued by the Institute for such respirator 
by filing an application for 
such modification in accordance with 
the provisions of this section. 
(b) Applications shall be submitted as 
for an original certificate of approval, 
with a request for a modification of the 
existing certificate to cover any proposed 
change. 
(c) The application shall be accompanied 
by appropriate drawings and 
specifications, and by a proposed quality 
control plan which meets the requirements 
of subpart E of this part. 
551 




� 84.36 

(d) The application for modification, 
together with the accompanying material, 
shall be examined by the Institute 
to determine whether testing will be 
required. 
(e) The Institute shall inform the applicant 
of the fee required for any additional 
testing and the applicant will be 
charged for the actual cost of any examination, 
inspection, or test required, 
and such fees shall be submitted in accordance 
with the provisions of subpart 
C of this part. 
(f) If the proposed change or modification 
meets the requirements of this 
part, a formal certificate of modification 
will be issued, accompanied, where 
necessary, by a list of new and revised 
drawings and specifications covering 
the change(s) and reproductions of revised 
approval labels. 
(The information collections contained in 
this section are approved under OMB control 
number 0920�0109) 

� 84.36 Delivery of changed or modified 
approved respirator. 

An approved respirator for which a 
formal certificate of modification has 
been issued shall be delivered, with 
proper markings and containers, by the 
applicant to the Certification and 
Quality Assurance Branch, as soon as 
it is commercially produced. 

Subpart E�Quality Control 

� 84.40 Quality control plans; filing requirements. 


As a part of each application for approval 
or modification of approval submitted 
pursuant to this part, each applicant 
shall file with the Institute a 
proposed quality control plan which 
shall be designed to assure the quality 
of respiratory protection provided by 
the respirator for which approval is 
sought. 

� 84.41 Quality control plans; contents. 

(a) Each quality control plan shall 
contain provisions for the management 
of quality, including: 
(1) Requirements for the production 
of quality data and the use of quality 
control records; 
(2) Control of engineering drawings, 
documentations, and changes; 
42 CFR Ch. I (10�1�10 Edition) 

(3) Control and calibration of measuring 
and test equipment; 
(4) Control of purchased material to 
include incoming inspection; 
(5) Lot identification, control of 
processes, manufacturing, fabrication, 
and assembly work conducted in the 
applicant�s plant; 
(6) Audit of final inspection of the 
completed product; and 
(7) The organizational structure necessary 
to carry out these provisions. 
(b) Each provision for incoming and 
final inspection in the quality control 
plan shall include a procedure for the 
selection of a sample of respirators and 
the components thereof for testing, in 
accordance with procedures set forth in 
Military Standard MIL-STD-414, 11 
June 1957, including Change Notice No. 
1, ��Sampling Procedures and Tables for 
Inspection by Variables for Percent Defective,�� 
or an approved equivalent 
sampling procedure, or an approved 
combination of sampling procedures. 
The procedure of Military Standard 
MIL-STD-105D, 29 April 1963, ��Sampling 
Procedures and Tables for Inspection 
by Attributes,�� is an example of 
an equivalent sampling procedure. 
MIL-STD-414 is incorporated by reference 
and has been approved by the 
Director of the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR 
part 51. Copies may be obtained from 
DODSSP, Standardization Document 
Order Desk, 700 Robbins Avenue, Bldg. 
4D, Philadelphia, PA 19111�5094. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. Copies of MIL-STD-
105D may be inspected or obtained from 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888. Incoming 
bulk raw material inspection 
or verification of specification, and in-
process inspection shall be sufficient to 
ensure control of product quality 
through the manufacturing cycle. 
552 




Public Health Service, HHS 

(c) The sampling procedure shall include 
a list of the characteristics to be 
tested by the applicant or his agent. 
(d) The characteristics listed in accordance 
with paragraph (c) of this section 
shall be classified according to the 
potential effect of such defect and 
grouped into the following classes: 
(1) Critical. A defect that judgment 
and experience indicate is likely to result 
in a condition immediately hazardous 
to life or health for individuals 
using or depending upon the respirator; 
(2) Major A. A defect, other than critical, 
that is likely to result in failure 
to the degree that the respirator does 
not provide any respiratory protection, 
or a defect that reduces protection and 
is not detectable by the user; 
(3) Major B. A defect, other than 
Major A or critical, that is likely to result 
in reduced respiratory protection, 
and is detectable by the user; and 
(4) Minor. A defect that is not likely 
to materially reduce the usability of 
the respirator for its intended purpose, 
or a defect that is a departure from established 
standards and has little bearing 
on the effective use or operation of 
the respirator. 
(e) The quality control inspection 
test method to be used by the applicant 
or his agent for each characteristic required 
to be tested shall be described in 
detail. 
(f) Each item manufactured shall be 
100 percent inspected for defects in all 
critical characteristics and all defective 
items shall be rejected. 
(g) The Acceptable Quality Level 
(AQL) for each major or minor defect 
so classified by the applicant shall be: 
(1) Major A. 1.0 percent; 
(2) Major B. 2.5 percent; and 
(3) Minor. 4.0 percent. 
(h) Except as provided in paragraph 
(i) of this section, inspection level IV 
as described in MIL-STD-414, 11 June 
1957, including Change Notice No.1, 
��Sampling Procedures and Tables for 
Inspection by Variables for Percent Defective,�� 
or an equivalent procedure, 
shall be used for major and minor characteristics 
and 100 percent inspection 
for critical characteristics. Inspection 
level II as described in MIL-STD-105D, 
29 April 1963, ��Sampling Procedures 
and Tables for Inspection by At� 
84.43 

tributes,�� is an example of an equivalent 
procedure. 

(i) Subject to the approval of the Institute, 
where the quality control plan 
provisions for raw material, processes, 
manufacturing, and fabrication, inspections 
are adequate to ensure control 
of finished article quality, destructive 
testing of finished articles may be 
conducted at a lower level of inspection 
than that specified in paragraph 
(h) of this section. 
(The information collections contained in 
this section are approved under OMB control 
number 0920�0109) 

� 84.42 Proposed quality control plans; 
approval by the Institute. 

(a) Each proposed quality control 
plan submitted in accordance with this 
subpart shall be reviewed by the Institute 
to determine its effectiveness in 
ensuring the quality of respiratory protection 
provided by the respirator for 
which an approval is sought. 
(b) If the Institute determines that 
the proposed quality control plan submitted 
by the applicant will not ensure 
adequate quality control, the Institute 
shall require the applicant to modify 
the procedures and testing requirements 
of the plan prior to approval of 
the plan and issuance of any certificate 
of approval. 
(c) Approved quality control plans 
shall constitute a part of and be incorporated 
into any certificate of approval 
issued by the Institute, and compliance 
with such plans by the applicant shall 
be a condition of approval. 
� 84.43 Quality control records; reviewby the Institute; revocation of approval. 


(a) The applicant shall keep quality 
control inspection records sufficient to 
carry out the procedures required in 
MIL-STD-414, 11 June 1957, including 
Change Notice No. 1, ��Sampling Procedures 
and Tables for Inspection by 
Variables for Percent Defective,�� or an 
approved equivalent sampling procedure. 
MIL-STD-105D, 29 April 1963, 
��Sampling Procedures and Tables for 
Inspection by Attributes,�� is an example 
of an approved equivalent sampling 
procedure. MIL-STD-414 is incorporated 
by reference and has been approved 
by the Director of the Federal 
553 




� 84.50 

Register in accordance with 5 U.S.C. 
552(a) and 1 CFR part 51. Copies may be 
obtained from DODSSP, Standardization 
Document Order Desk, 700 Robbins 
Avenue, Bldg. 4D, Philadelphia, Pa. 
19111�5094. Copies may be inspected at 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888, or 
at the National Archives and Records 
Administration (NARA). For information 
on the availability of this material 
at NARA, call 202�741�6030, or go 
to: http://www.archives.gov/ 
federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. Copies of MIL-STD-
105D may be inspected or obtained from 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888. 

(b) The Institute reserves the right to 
have its representatives inspect the applicant�s 
quality control test methods, 
equipment, and records, and to interview 
any employee or agent of the applicant 
in regard to quality control 
test methods, equipment, and records. 
(c) The Institute reserves the right to 
revoke, for cause, any certificate of approval 
where it is found that the applicant�s 
quality control test methods, 
equipment, or records do not ensure effective 
quality control over the respirator 
for which the approval was 
issued. 
(The information collections contained in 
this section are approved under OMB control 
number 0920�0109) 

Subpart F�Classification of Approved 
Respirators; Scope ofApproval; Atmospheric Hazards; 
Service Time 

� 84.50 Types of respirators to be approved; 
scope of approval. 

Approvals shall be issued for the 
types of respirators which have been 
classified pursuant to this subpart F, 
have been inspected, examined and 
tested by the Institute, in accordance 
with the provisions of subparts G 
through L of this part, and have been 
found to provide respiratory protection 
for fixed periods of time against the 
hazards specified in such approval. 

42 CFR Ch. I (10�1�10 Edition) 

� 84.51 Entry and escape, or escapeonly; classification. 

Respirators described in subparts H 
through L of this part shall be classified 
for use as follows: 

(a) Entry and escape. Respirators designed 
and approved for use during 
entry into a hazardous atmosphere, 
and for escape from a hazardous atmosphere; 
or 
(b) Escape only. Respirators designed 
and approved for use only during escape 
from a hazardous atmosphere. 
� 84.52 Respiratory hazards; classification. 


Respirators described in subparts H 
through L of this part shall be classified 
as approved for use against any or 
all of the following respiratory hazards: 


(a) Oxygen deficiency; 
(b) Gases and vapors; and 
(c) Particles, including dusts, fumes 
and mists. 
� 84.53 Service time; classification. 

(a) Respirators described in subparts 
H through L of this part shall be classified, 
where applicable, as approved for 
use during the following prescribed 
service times: 
(1) Four hours; 
(2) Three hours; 
(3) Two hours; 
(4) One hour; 
(5) Forty-five minutes; 
(6) Thirty minutes; 
(7) Fifteen minutes; 
(8) Ten minutes; 
(9) Five minutes; or 
(10) Three minutes. 
(b) Other service times may be prescribed 
by the Institute. 
Subpart G�General Constructionand Performance Requirements 

� 84.60 Construction and performance 
requirements; general. 

(a) The Institute shall issue approvals 
for the types of respirators described 
in subparts H through L of this 
part which have met the minimum requirements 
set forth for such respirators 
in this part. 
(b) In addition to the types of respirators 
specified in subparts H 
through L of this part, the Institute 
554 




Public Health Service, HHS 

shall issue approvals for other respiratory 
protective devices not specifically 
described in this part subject to 
such additional requirements as may 
be imposed in accordance with 
� 84.63(c). 

� 84.61 General construction requirements. 


(a) Respirators will not be accepted 
by the Institute for examination, inspection 
and testing unless they are designed 
on sound engineering and scientific 
principles, constructed of suitable 
materials and evidence good workmanship. 
(b) Respirator components which 
come into contact with the wearer�s 
skin shall be made of nonirritating materials. 
(c) Components replaced during or 
after use shall be constructed of materials 
which will not be damaged by normal 
handling. 
(d) Mouthpieces, hoods, helmets, and 
facepieces, except those employed in 
single-use respirators, shall be constructed 
of materials which will withstand 
repeated disinfection as recommended 
by the applicant in his instructions 
for use of the device. 
� 84.62 Component parts; minimum requirements. 


(a) The component parts of each respirator 
shall be: 
(1) Designed, constructed, and fitted 
to insure against creation of any hazard 
to the wearer; 
(2) Assembled to permit easy access 
for inspection and repair of functional 
parts; and 
(3) Assembled to permit easy access 
to parts which require periodic cleaning 
and disinfecting. 
(b) Replacement parts shall be designed 
and constructed to permit easy 
installation and to maintain the effectiveness 
of the respirator. 
� 84.63 Test requirements; general. 

(a) Each respirator and respirator 
component shall when tested by the applicant 
and by the Institute, and meet 
the applicable requirements set forth 
in subparts H through L of this part. 
(b) Where a combination respirator is 
assembled from two or more types of 
respirators, as described in this part, 
� 84.64 

each of the individual respirator types 
which have been combined shall, as applicable, 
meet the minimum requirements 
for such respirators set forth in 
subparts H through L of this part, and 
such combination respirators, except 
as specified in � 84.70(b)(2), will be classified 
by the type of respirator in the 
combination which provides the least 
protection to the user. 

(c) In addition to the minimum requirements 
set forth in subparts H 
through L of this part, the Institute reserves 
the right to require, as a further 
condition of approval, any additional 
requirements deemed necessary to establish 
the quality, effectiveness, and 
safety of any respirator used as protection 
against hazardous atmospheres. 
(d) Where it is determined after receipt 
of an application that additional 
requirements will be required for approval, 
the Institute will notify the applicant 
in writing of these additional 
requirements, and necessary examinations, 
inspections, or tests, stating 
generally the reasons for such requirements, 
examinations, inspections, or 
tests. 
� 84.64 Pretesting by applicant; approval 
of test methods. 

(a) Prior to making or filing any application 
for approval or modification 
of approval, the applicant shall conduct, 
or cause to be conducted, examinations, 
inspections, and tests of respirator 
performance which are equal to 
or exceed the severity of those prescribed 
in this part. 
(b) With the application, the applicant 
shall provide a statement to the 
Institute showing the types and results 
of the examinations, inspections, and 
tests required under paragraph (a) of 
this section and state that the respirator 
meets the minimum requirements 
of subparts H through L of this 
part, as applicable. Complete examination, 
inspection, and test data shall be 
retained on file by the applicant and be 
submitted, upon request, to the Institute. 
(c) The Institute may, upon written 
request by the applicant, provide drawings 
and descriptions of its test equipment 
and otherwise assist the applicant 
in establishing a test laboratory 
555 




� 84.65 

or securing the services of a testing 
agency. 

(d) No approval will be issued until 
the Institute has validated the applicant�s 
test results. 
� 84.65 Conduct of examinations, inspections, 
and tests by the Institute;
assistance by applicant; observers;
recorded data; public demonstrations. 


(a) All examinations, inspections, 
and tests conducted pursuant to subparts 
H through L of this part will be 
under the sole direction and control of 
the Institute. 
(b) The Institute may, as a condition 
of approval, require the assistance of 
the applicant or agents of the applicant 
during the assembly, disassembly, or 
preparation of any respirator or respirator 
component prior to testing or 
in the operation of such equipment 
during testing. 
(c) Only Institute personnel, persons 
assisting the Institute pursuant to 
paragraph (b) of this section, and such 
other persons as are requested by the 
Institute or the applicant to be observers, 
shall be present during any examination, 
inspection, or test conducted 
prior to the issuance of an approval by 
the Institute for the equipment under 
consideration. 
(d) The Institute shall hold as confidential 
any analyses, drawings, specifications, 
or materials submitted by 
the applicant and shall not disclose 
any principles or patentable features of 
such equipment, except as required by 
statute or regulation. 
(e) As a condition of each approval 
issued for any respirator, the Institute 
reserves the right, following the 
issuance of such approval, to conduct 
such public tests and demonstrations 
of the approved respiratory equipment 
as is deemed appropriate. 
� 84.66 Withdrawal of applications; refund 
of fees. 

(a) Any applicant may, upon a written 
request submitted to the Institute, 
withdraw any application for approval 
of any respirator. 
(b) Upon receipt of a written request 
for the withdrawal of an application, 
the Institute shall determine the total 
man-days expended and the amount 
due for services already performed dur42 
CFR Ch. I (10�1�10 Edition) 

ing the course of any examinations, inspections, 
or tests conducted pursuant 
to such application. The total amount 
due shall be determined in accordance 
with the provisions of � 84.22 and assessed 
against the fees submitted by 
the applicant. If the total amount assessed 
is less than the fees submitted, 
the Institute shall refund the balance 
together with a statement of the 
charges made for services rendered. 

Subpart H�Self-Contained
Breathing Apparatus 


� 84.70 Self-contained breathing apparatus; 
description. 

(a) Self-contained breathing apparatus, 
including all completely assembled, 
portable, self-contained devices 
designed for use as respiratory protection 
during entry into and escape from 
or escape only from hazardous 
atmospheres, are described as follows: 
(1) Closed-circuit apparatus. An apparatus 
of the type in which the exhalation 
is rebreathed by the wearer after 
the carbon dioxide has been effectively 
removed and a suitable oxygen concentration 
restored from sources composed 
of: 
(i) Compressed oxygen; or 
(ii) Chemical oxygen; or 
(iii) Liquid-oxygen. 
(2) Open-circuit apparatus. An apparatus 
of the following types from which 
exhalation is vented to the atmosphere 
and not rebreathed: 
(i) Demand-type apparatus. An apparatus 
in which the pressure inside the 
facepiece in relation to the immediate 
environment is positive during exhalation 
and negative during inhalation; or 
(ii) Pressure-demand-type apparatus. 
An apparatus in which the pressure inside 
the facepiece in relation to the immediate 
environment is positive during 
both inhalation and exhalation. 
(b) The following respirators may be 
classified as designed and approved for 
use during emergency entry into a hazardous 
atmosphere: 
(1) A combination respirator which 
includes a self-contained breathing apparatus; 
and 
(2) A Type ��C�� or Type ��CE�� supplied 
air respirator, where� 
(i) The self-contained breathing apparatus 
is classified for 3-, 5-, or 10-
556 




Public Health Service, HHS 

minute service time and the air line 
supply is used during entry; or 

(ii) The self-contained breathing apparatus 
is classified for 15 minutes or 
longer service time and not more than 
20 percent of the rated capacity of the 
air supply is used during entry. 
(c) Self-contained breathing apparatus 
classified for less than 1 hour 
service time will not be approved for 
use during underground mine rescue 
and recovery operations except as auxiliary 
equipment. 
(d) Self-contained breathing apparatus 
classified for less than 30 minutes� 
service time will not be approved 
for use as auxiliary equipment during 
underground mine rescue and recovery 
operations. 
� 84.71 Self-contained breathing apparatus; 
required components. 

(a) Each self-contained breathing apparatus 
described in � 84.70 shall, where 
its design requires, contain the following 
component parts: 
(1) Facepiece or mouthpiece, and 
noseclip; 
(2) Respirable breathing gas container; 
(3) Supply of respirable breathing 
gas; 
(4) Gas pressure or liquid level gages; 
(5) Timer; 
(6) Remaining service life indicator 
or warning device; 
(7) Hand-operated valves; 
(8) Breathing bag; 
(9) Safety relief valve or safety relief 
system; and 
(10) Harness. 
(b) The components of each self-contained 
breathing apparatus shall meet 
the minimum construction requirements 
set forth in subpart G of this 
part. 
� 84.72 Breathing tubes; minimum requirements. 


Flexible breathing tubes used in conjunction 
with breathing apparatus 
shall be designed and constructed to 
prevent: 

(a) Restriction of free head movement; 
(b) Disturbance of the fit of 
facepieces and mouthpieces; 
(c) Interference with the wearer�s activities; 
and 
� 84.75 

(d) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.73 Harnesses; installation and construction; 
minimum requirements. 

(a) Each apparatus shall, where necessary, 
be equipped with a suitable harness 
designed and constructed to hold 
the components of the apparatus in position 
against the wearer�s body. 
(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of apparatus parts 
and, where applicable, provide for holding 
a full facepiece in the ready position 
when not in use. 
� 84.74 Apparatus containers; minimum 
requirements. 

(a) Apparatus may be equipped with a 
substantial, durable container bearing 
markings which show the applicant�s 
name, the type and commercial designation 
of the respirator it contains, 
and all appropriate approval labels. 
(b) Containers supplied by the applicant 
for carrying or storing self-contained 
breathing apparatus will be inspected, 
examined, and tested as components 
of the respirator for which approval 
is sought. 
(c) Containers for self-contained 
breathing apparatus shall be designed 
and constructed to permit easy removal 
of the apparatus. 
� 84.75 Half-mask facepieces, full 
facepieces, mouthpieces; fit; minimum 
requirements. 

(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes, either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Full facepieces shall provide for 
the optional use of corrective spectacles 
or lenses which shall not reduce 
the respiratory protective qualities of 
the apparatus. 
(c) Apparatus with mouthpieces shall 
be equipped with noseclips which are 
securely attached to the mouthpiece or 
apparatus and provide an airtight seal. 
557 




� 84.76 

(d) Facepieces shall be designed to 
prevent eyepiece, spectacle, and lens 
fogging. 
� 84.76 Facepieces; eyepieces; minimum 
requirements. 

(a) Facepieces shall be designed and 
constructed to provide adequate vision 
which is not distorted by the eyepiece. 
(b) All eyepieces shall be designed 
and constructed to be impact and penetration 
resistant. Federal Specification, 
Mask, Air Line: and Respirator, 
Air Filtering, Industrial, GGG-M-125d, 
October 11, 1965 with interim amendment-
1, July 30, 1969, is an example of 
an appropriate standard for determining 
impact and penetration resistance. 
Copies of GGG-M-125d may be obtained 
from the NIOSH, Certification 
and Quality Assurance Branch, 1095 
Willowdale Road, Morgantown, WV 
26505�2888. 
� 84.77 Inhalation and exhalation 
valves; minimum requirements. 

(a) Inhalation and exhalation valves 
shall be provided where necessary and 
protected against damage and distortion. 
(b) Exhalation valves shall be� 
(1) Protected against external influence; 
and 
(2) Designed and constructed to prevent 
inward leakage of contaminated 
air. 
� 84.78 Head harnesses; minimum requirements. 


(a) Facepieces shall be equipped with 
adjustable and replaceable head harnesses 
designed and constructed to provide 
adequate tension during suspension 
and an even distribution of pressure 
over the entire area in contact 
with the face. 
(b) Mouthpieces shall be equipped, 
where applicable, with adjustable and 
replaceable harnesses designed and 
constructed to hold the mouthpiece in 
place. 
� 84.79 Breathing gas; minimum requirements. 


(a) Breathing gas used to supply apparatus 
shall be respirable and contain 
no less than 19.5 (dry atmosphere) volume 
percent of oxygen. 
42 CFR Ch. I (10�1�10 Edition) 

(b) Oxygen, including liquid oxygen, 
shall contain not less than 99.0 percent, 
by volume, of pure O2, not more than 
0.03%, by volume, carbon dioxide, and 
not more than 0.001%, by volume, carbon 
monoxide. Methods for making 
these determinations can be found in 
the U.S. Pharmacopeia National Formulary. 
Containers used for oxygen 
must not be treated with any toxic, 
sleep-inducing, narcosis-producing, or 
respiratory tract irritating compounds. 
(c) Compressed, gaseous breathing air 
shall meet the applicable minimum 
grade requirements for Type I gaseous 
air set forth in the Compressed Gas Association 
Commodity Specification for 
Air, G�7.1, 1966 (Grade D or higher quality). 
G�7.1 is incorporated by reference 
and has been approved by the Director 
of the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from American 
National Standards Institute, Inc., 1430 
Broadway, New York, NY 10018. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 
(d) Compressed, liquefied breathing 
air shall meet the applicable minimum 
grade requirements for Type II liquid 
air set forth in the Compressed Gas Association 
Commodity Specification for 
Air, G�7.1, 1966 (Grade B or higher quality). 
G�7.1 is incorporated by reference 
and has been approved by the Director 
of the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from American 
National Standards Institute, Inc., 1430 
Broadway, New York, NY 10018. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 
558 




Public Health Service, HHS 

codeloflfederallregulations/ 
ibrllocations.html. 

� 84.80 Interchangeability of oxygen 
and air prohibited. 

Approvals shall not be issued by the 
Institute for any apparatus, combination 
of respirator assemblies, or any 
apparatus or respirator component 
which is designed or constructed to 
permit the interchangeable use of oxygen 
and air. 

� 84.81 Compressed breathing gas and

liquefied breathing gas containers; 

minimum requirements. 

(a) Compressed breathing gas and liquefied 
breathing gas containers shall 
meet the minimum requirements of the 
Department of Transportation for 
interstate shipment of such containers 
when fully charged. 
(b) Such containers shall be permanently 
and legibly marked to identify 
their contents, e.g., compressed breathing 
air, compressed breathing oxygen, 
liquefied breathing air, or liquefied 
breathing oxygen. 
(c) Containers normally removed 
from apparatus for refilling shall be 
equipped with a dial indicating gage 
which shows the pressure in the container. 
(d) Compressed breathing gas contained 
valves or a separate charging 
system or adapter provided with each 
apparatus shall be equipped with outlet 
threads specified for the service by the 
American Standards Association, Compressed 
Gas Cylinder Valve Outlet and 
Inlet Connections, B57.1�1965. B57.1�1965 
is incorporated by reference and has 
been approved by the Director of the 
Federal Register in accordance with 5 
U.S.C. 552(a) and 1 CFR part 51. Copies 
may be obtained from American National 
Standards Institute, Inc., 1430 
Broadway, New York, NY Copies may 
be inspected at the NIOSH, Certification 
and Quality Assurance Branch, 
1095 Willowdale Road, Morgantown, WV 
26505�2888, or at the National Archives 
and Records Administration (NARA). 
For information on the availability of 
this material at NARA, call 202�741� 
6030, or go to: http://www.archives.gov/ 
federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 
� 84.82 

� 84.82 Gas pressure gages; minimumrequirements. 

(a) Gas pressure gages employed on 
compressed breathing gas containers 
shall be calibrated in pounds per square 
inch. 
(b) Liquid-level gages shall be calibrated 
in fractions of total container 
capacity, or in units of liquid volume. 
(c) Gas pressure gages other than 
those specified in paragraphs (a) and 
(b) of this section shall be calibrated 
in: 
(1) Pounds per square inch; or 
(2) In fractions of total container capacity; 
or 
(3) Both in pounds per square inch 
and fractions of total container capacity. 
(d)(1) Dial-indicating gages shall be 
reliable to within �5 percent of full 
scale when tested both up and down the 
scale at each of 5 equal intervals. 

(2) The full-scale graduation of dial-
indicating gages shall not exceed 150 
percent of the maximum rated cylinder 
pressures specified for the container in 
applicable Department of Transportation 
specifications or permits. 
(e)(1) Stem-type gages shall be readable 
by sight and by touch and shall 
have a stem travel distance of not less 
than one-fourth inch between each 
graduation. 

(2) A minimum of five graduations 
shall be engraved on the stem of each 
gage and these graduations shall include 
readings for empty, one-quarter, 
one-half, three-quarters, and full. 
(3) Stem gage readings shall not vary 
from true readings by more than one-
sixteenth inch per inch of stem travel. 
(f) The loss of gas through a broken 
gage or severed gage connection shall 
not exceed 70 liters per minute when 
the cylinder pressure is 6,900 kN/m.2 
(1,000 pounds per square inch gage) or 
when the liquid level is at one-half. 
(g) Where gages are connected to the 
apparatus through a gage line, the gage 
and line shall be capable of being isolated 
from the apparatus except where 
the failure of the gage or line would 
not impair the performance or service 
life of the apparatus. 
(h) Oxygen pressure gages shall have 
the words ��Oxygen�� and ��Use No Oil�� 
marked prominently on the gage. 
559 




� 84.83 

(i)(1) Apparatus using compressed 
breathing gas, except apparatus classified 
for escape only, shall be equipped 
with gages visible to the wearer which 
indicate the remaining gas content in 
the container. 

(2) Apparatus using liquefied breathing 
gas, except apparatus classified for 
escape only, shall be equipped with 
gages visible to the wearer which indicate 
the remaining liquid content in 
the container; however, where the liquid 
content cannot be rapidly vented, 
and the service time of the device begins 
immediately after filling, a timer 
shall be provided in place of a visible 
gage. 
� 84.83 Timers; elapsed time indica


tors; remaining service life indica


tors; minimum requirements. 

(a) Elapsed time indicators shall be 
provided for apparatus with a chemical 
oxygen source, except: 
(1) Apparatus used for escape only; or 
(2) Liquefied breathing gas apparatus 
equipped with gages visible to the 
wearer which indicate the remaining 
liquid content in the container. 
(b) The timer or other indicator shall 
be accurately calibrated in minutes of 
remaining service life. 
(c) Timers shall be readable by sight 
and by touch during use by the wearer. 
(d) Timers shall be equipped with 
automatically preset alarms which will 
warn the wearer for a period of 7 seconds 
or more after the preset time has 
elapsed. 
(e) Remaining service-life indicators 
or warning devices shall be provided in 
addition to a pressure gage on compressed 
gas self-contained breathing 
apparatus, except apparatus used for 
escape only, and shall operate automatically 
without preadjustment by 
the wearer. 
(f) Each remaining service-life indicator 
or warning device shall give an 
alarm when the remaining service life 
of the apparatus is reduced within a 
range of 20 to 25 percent of its rated 
service time. 
� 84.84 Hand-operated valves; minimum 
requirements. 

(a) Hand-operated valves shall be designed 
and constructed to prevent removal 
of the stem from the valve body 
42 CFR Ch. I (10�1�10 Edition) 

during normal usage to insure against 
a sudden release of the full pressure of 
the container when the valve is opened. 

(b) Valves shall be designed or positioned 
to prevent accidental opening 
and closing, and damage from external 
forces. 
(c) Valves operated during use of the 
apparatus shall be installed in locations 
where they can be readily adjusted 
by the wearer. 
(d) Main-line valves, designed and 
constructed to conserve gas in the 
event of a regulator or demand valve 
failure, shall be provided in addition to 
gas container valves, except when such 
failure will not affect performance. 
(e) Hand-operated bypass systems designed 
and constructed to permit the 
wearer to breathe and to conserve his 
gas supply in the event of a regulator 
or demand valve failure, shall be provided 
where necessary. 
(f) Valves installed on apparatus 
shall be clearly distinguishable from 
one another by sight and touch. 
(g) The bypass system valve control 
shall be colored red. 
(h) A main-line or bypass valve or 
system will not be required on apparatus 
for escape only. 
(i) Safety relief valves or systems, 
designed and constructed to release excess 
pressure in the breathing circuit, 
shall be provided on closed-circuit apparatus, 
and shall meet the following 
requirements: 
(1) The relief valve or system shall 
operate automatically when the pressure 
in the breathing circuit on the inhalation 
side of the breathing bag 
reaches 13 mm. (one-half inch) water-
column height of pressure above the 
minimum pressure required to fill the 
breathing bag, within the breathing resistance 
requirements for the apparatus. 
(2) The relief valve or system shall be 
designed to prevent external 
atmospheres from entering the breathing 
circuit. 
(3) The relief valve or system shall be 
designed to permit manual overriding 
for test purposes and in the event of a 
failure in the valve or system. 
560 




Public Health Service, HHS 

� 84.85 Breathing bags; minimum requirements. 


(a) Breathing bags shall have sufficient 
volume to prevent gas waste during 
exhalation and to provide an adequate 
reserve for inhalation. 
(b) Breathing bags shall be constructed 
of materials which are flexible 
and resistant to gasoline vapors. 
(c) Breathing bags shall be installed 
in a location which will protect them 
from damage or collapse by external 
forces, except on apparatus classified 
for escape only. 
� 84.86 Component parts exposed to 

oxygen pressures; minimum re


quirements. 

Each applicant shall certify that the 
materials employed in the construction 
of component parts exposed to oxygen 
pressures above atmospheric pressure 
are safe and compatible for their 
intended use. 

� 84.87 Compressed gas filters; minimum 
requirements. 

All self-contained breathing apparatus 
using compressed gas shall have 
a filter downstream of the gas source 
to effectively remove particles from 
the gas stream. 

� 84.88 Breathing bag test. 

(a) Breathing bags will be tested in 
an air atmosphere saturated with gasoline 
vapor at room temperature (24�30 
�C./75�85 �F.) for a continuous period of 
twice the rated time of the apparatus 
(except for apparatus for escape only 
where the test period shall be the rated 
time of the apparatus). 
(b) The bag will be operated during 
this test by a breathing machine with 
24 respirations per minute and a 
minute-volume of 40 liters. 
(c) A breathing machine cam with a 
work rate of 622 kp.-m./min. will be 
used. The dimensions of a suitable 
breathing machine cam are available 
from the Institute upon request. 
(d) The air within the bag(s) shall not 
contain more than 100 parts per million 
of gasoline vapor at the end of the test. 
� 84.89 Weight requirement. 

(a) The completely assembled and 
fully charged apparatus shall not weigh 
more than 16 kg. (35 pounds); however, 
� 84.91 

where the weight decreases by more 
than 25 percent of its initial charge 
weight during its rated service life, the 
maximum allowable weight of a completely 
assembled and fully charged apparatus 
shall be 18 kg. (40 pounds). 

(b) Where an apparatus employs 
equipment which contributes materially 
to the wearer�s comfort, e.g., a 
cooling system, the completely assembled 
and fully charged apparatus shall 
not weigh more than 18 kg. (40 pounds) 
regardless of the decrease in weight 
during use. 
� 84.90 Breathing resistance test; inhalation. 


(a) Resistance to inhalation airflow 
will be measured in the facepiece or 
mouthpiece while the apparatus is operated 
by a breathing machine as described 
in � 84.88. 
(b) The inhalation resistance of open-
circuit apparatus shall not exceed 32 
mm. (1.25 inch) water-column height 
(at a flow rate of 120 liters per minute). 
(c) The inhalation resistance of 
closed-circuit apparatus shall not exceed 
the difference between exhalation 
resistance (� 84.91(e)) and 10 cm. (4 
inches) water-column height. 
� 84.91 Breathing resistance test; exhalation. 


(a) Resistance to exhalation airflow 
will be measured in the facepiece or 
mouthpiece of open-circuit apparatus 
with air flowing at a continuous rate of 
85 liters per minute. 
(b) The exhalation resistance of demand 
apparatus shall not exceed 25 
mm. (1 inch) water-column height. 
(c) The exhalation resistance of pressure-
demand apparatus shall not exceed 
the static pressure in the face-
piece by more than 51 mm. (2 inches) 
water-column height. 
(d) The static pressure (at zero flow) 
in the facepiece shall not exceed 38 
mm. (1.5 inches) water-column height. 
(e) Resistance to exhalation airflow 
will be measured in the facepiece or 
mouthpiece of closed-circuit apparatus 
with a breathing machine as described 
in � 84.88, and the exhalation resistance 
shall not exceed 51 mm. (2 inches) 
water-column height. 
561 




� 84.92 

� 84.92 Exhalation valve leakage test. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. (1 inch) water-column height 
while in a normal operating position. 
(b) Leakage between the valve and 
the valve seat shall not exceed 30 milliliters 
per minute. 
� 84.93 Gas flow test; open-circuit apparatus. 


(a) A static-flow test will be performed 
on all open-circuit apparatus. 
(b) The flow from the apparatus shall 
be greater than 200 liters per minute 
when the pressure in the facepiece of 
demand-apparatus is lowered by 51 mm. 
(2 inches) water-column height when 
full container pressure is applied. 
(c) Where pressure demand apparatus 
are tested, the flow will be measured at 
zero gage pressure in the facepiece. 
(d) Where apparatus with compressed-
breathing-gas containers are 
tested, the flow test shall also be made 
with 3,450 kN/m.2 (500 p.s.i.g.) container 
pressure applied. 
� 84.94 Gas flow test; closed-circuit apparatus. 


(a) Where oxygen is supplied by a 
constant-flow device only, the rate of 
flow shall be at least 3 liters per 
minute for the entire rated service 
time of the apparatus. 
(b) Where constant flow is used in 
conjunction with demand flow, the constant 
flow shall be greater than 1.5 liters 
per minute for the entire rated 
service time. 
(c) All demand-flow devices shall provide 
at least 30 liters of oxygen per 
minute when in the fully open position. 
� 84.95 Service time test; open-circuit 
apparatus. 

(a) Service time will be measured 
with a breathing machine as described 
in � 84.88. 
(b) The open-circuit apparatus will be 
classified according to the length of 
time it supplies air or oxygen to the 
breathing machine. 
(c) The service time obtained on this 
test will be used to classify the open-
circuit apparatus in accordance with 
� 84.53. 
42 CFR Ch. I (10�1�10 Edition) 

� 84.96 Service time test; closed-circuit 
apparatus. 

(a) The closed-circuit apparatus will 
be classified according to the length of 
time it supplies adequate breathing gas 
to the wearer during man test No. 4 described 
in Table 4 of this subpart. 
(b) The service time obtained on man 
test No. 4 will be used to classify the 
closed-circuit apparatus in accordance 
with � 84.53. 
� 84.97 Test for carbon dioxide in inspired 
gas; open- and closed-circuit 
apparatus; maximum allowable limits. 


(a) Open-circuit apparatus. (1) The 
concentration of carbon dioxide in inspired 
gas in open-circuit apparatus 
will be measured at the mouth while 
the apparatus mounted on a dummy 
head is operated by a breathing machine. 
An acceptable method for measuring 
the concentration of carbon dioxide 
is described in Bureau of Mines Report 
of Investigations 6865, A Machine-
Test Method for Measuring Carbon Dioxide 
in the Inspired Air of Self-Contained 
Breathing Apparatus, 1966. Copies 
of Report of Investigations 6865 may 
be inspected or obtained from the 
NIOSH, Certification and Quality Assurance 
Branch, 1095 Willowdale Road, 
Morgantown, WV. 26505�2888. 
(2) The breathing rate will be 14.5 respirations 
per minute with a minute-
volume of 10.5 liters. 
(3) A sedentary breathing machine 
cam will be used. 
(4) The apparatus will be tested at a 
temperature of 27 �2 �C. (80 �5 �F.). 
(5) A concentration of 5 percent carbon 
dioxide in air will be exhaled into 
the facepiece. 
(b) Closed-circuit apparatus. The concentration 
of carbon dioxide in inspired 
gas in closed-circuit apparatus will be 
measured at the mouth while the parts 
of the apparatus contributing to dead-
air space are mounted on a dummy 
head and operated by the breathing 
machine as in paragraphs (a) (1) 
through (5) of this section. 
(c) During the testing required by 
paragraphs (a) and (b) of this section, 
the concentration of carbon dioxide in 
inspired gas at the mouth will be continuously 
recorded, and the maximum 
562 




Public Health Service, HHS 

average concentration during the inhalation 
portion of the breathing cycle 
shall not exceed the following limits: 

Maximum allowable average 
concentration of 
Where the service time is 

carbon dioxide in inspired 
air percent by volume 


Not more than 30 minutes ............. 


2.5 
1 hour ............................................ 
2.0 
2 hours ........................................... 
1.5 
3 hours ........................................... 
1.0 
4 hours ........................................... 
1.0 

(d) In addition to the test requirements 
for closed-circuit apparatus set 
forth in paragraph (b) of this section, 
gas samples will be taken during the 
course of the man tests described in 
Tables 1, 2, 3, and 4 of this subpart. 
These gas samples will be taken from 
the closed-circuit apparatus at a point 
downstream of the carbon dioxide sorbent, 
and they shall not contain more 
than 0.5 percent carbon dioxide at any 
time, except on apparatus for escape 
only, using a mouthpiece only, the 
sample shall not contain more than 1.5 
percent carbon dioxide at any time. 
� 84.98 Tests during low temperature 
operation. 

(a) The applicant shall specify the 
minimum temperature for safe operation 
and two persons will perform the 
tests described in paragraphs (c) and 
(d) of this section, wearing the apparatus 
according to applicant�s directions. 
At the specified temperature, the 
apparatus shall meet all the requirements 
described in paragraph (e) of this 
section. 
(b) The apparatus will be precooled at 
the specified minimum temperature for 
4 hours. 
(c) The apparatus will be worn in the 
low temperature chamber for 30 minutes, 
or for the service time of the apparatus, 
whichever is less. 
(d) During the test period, alternate 
1-minute periods of exercise and rest 
will be required with the exercise periods 
consisting of stepping onto and off 
a box 21.5 cm. (81/2 inches) high at a 
rate of 30 cycles per minute. 
(e)(1) The apparatus shall function 
satisfactorily at the specified minimum 
temperature on duplicate tests. 

(2) The wearer shall have sufficient 
unobscured vision to perform the work. 
� 84.100 

(3) The wearer shall not experience 
undue discomfort because of airflow restriction 
or other physical or chemical 
changes in the operation of the apparatus. 
(f) Auxiliary low-temperature parts 
which are commercially available to 
the user may be used on the apparatus 
to meet the requirements described in 
paragraph (e) of this section. 
� 84.99 Man tests; testing conditions;
general requirements. 

(a) The man tests described in Tables 
1, 2, 3, and 4 of this subpart represent 
the workload performed in the mining, 
mineral, or allied industries by a person 
wearing the apparatus tested. 
(b) The apparatus tested will be worn 
by Institute personnel trained in the 
use of self-contained breathing apparatus, 
and the wearer will, before participating 
in these tests, pass a physical 
examination conducted by a qualified 
physician. 
(c) All man tests will be conducted by 
the Institute. 
(d) The apparatus will be examined 
before each man test to ensure that it 
is in proper working order. 
(e) Breathing resistance will be measured 
within the facepiece or mouthpiece 
and the wearer�s pulse and respiration 
rate will be recorded during 
each 2 minute sample period prescribed 
in tests 1, 2, 3, and 4. 
(f) Man tests 1, 2, 3, 4, 5, and 6 will be 
conducted in duplicate. 
(g) If man tests are not completed 
through no fault of the apparatus, the 
test will be repeated. 
� 84.100 Man tests 1, 2, 3, and 4; requirements. 


Man tests 1, 2, 3, and 4, set forth in 
Tables 1, 2, 3, and 4 of this subpart, respectively, 
prescribe the duration and 
sequence of specific activities. These 
tests will be conducted to� 

(a) Familiarize the wearer with the 
apparatus during use; 
(b) Provide for a gradual increase in 
activity; 
(c) Evaluate the apparatus under different 
types of work and physical orientation; 
and 
(d) Provide information on the operating 
and breathing characteristics of 
the apparatus during actual use. 
563 




� 84.101 

� 84.101 Man test 5; requirements. 

(a) Test 5 will be conducted to determine 
the maximum length of time the 
apparatus will supply the respiratory 
needs of the wearer while he is sitting 
at rest. 
(b) The wearer will manipulate the 
devices controlling the supply of 
breathing gas to the advantage of the 
apparatus. 
(c) Samples of inspiration from within 
the apparatus facepiece or mouthpiece 
shall be taken once every 15 minutes, 
and shall meet the minimum requirement 
for oxygen specified in 
� 84.79(a), and the maximum allowable 
average concentration of carbon dioxide 
specified in � 84.97(c). 
(d) One sample of inspiration will be 
taken in the case of 3-, 5-, and 10-
minute apparatus. 
� 84.102 Man test 6; requirements. 

(a) Man test 6 will be conducted with 
respect to liquefied breathing gas apparatus 
only. 
(b) This test will be conducted to 
evaluate operation of the apparatus in 
other than vertical positions. 
42 CFR Ch. I (10�1�10 Edition) 

(c) The wearer will lie face downward 
for one-fourth the service life of the apparatus 
with a full charge of liquefied 
breathing gas, and then a one-quarter 
full charge of liquefied breathing gas. 
(d) The test will be repeated with the 
wearer lying on each side and on his 
back. 
(e) The oxygen content of the gas 
supplied to the wearer by the apparatus 
will be continuously measured. 
� 84.103 Man tests; performance requirements. 


(a) The apparatus shall satisfy the 
respiratory requirements of the wearer 
for the classified service time. 
(b) Fogging of the eyepiece shall not 
obscure the wearer�s vision, and the 
wearer shall not experience undue discomfort 
because of fit or other characteristics 
of the apparatus. 
(c) When the ambient temperature 
during testing is 24 �6 �C. (75 �10 �F.), 
the maximum temperature of inspired 
air recorded during man tests shall not 
exceed the following, after correction 
for deviation from 24 �C. (75 �F.): 
Maximum permissible

Where percent 

temperature of inspired air

relative humid-

Where service life of apparatus is� ity of inspired shall not exceed� 
air is� �F. �C. 
1/4 hour or less .......................................................................................................... 0�100 135 57 
1/4 hour to 3/4 hour ..................................................................................................... 0�50 125 52 
50�100 1 110 1 43 
1 to 2 hours ............................................................................................................... 0�50 115 46 
50�100 1105 141 
3 hours ...................................................................................................................... 0�50 110 43 
50�100 1100 1 38 
4 hours ...................................................................................................................... 0�50 105 41 
50�100 1 95 1 35 

1 Where percent relative humidity is 50�100 and apparatus is designed for escape only, these maximum permissible temperatures 
will be increased by 5 �C (10 �F). 

� 84.104 Gas tightness test; minimum (b) Six persons will each wear the ap


requirements. paratus in the test concentrations 

specified in paragraph (a) of this sec


(a) Each apparatus will be tested for 
tightness by persons wearing it in an 
tion for 2 minutes and none shall de-
atmosphere of 1,000 p.p.m. isoamyl ace


tect the odor or taste of the test vapor. 
tate. 

564 




Public Health Service, HHS Pt. 84, Subpt. H, Tables 

TABLES TO SUBPART H OF PART 84 

TABLE 1�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 1, IN MINUTES 

[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 2, 3, and 4 hours 
Sampling and readings ......... .............. .............. .............. 2 2 2 2 Perform 1 hour 
test 2, 3, or 4 
times respectively. 
Walks at 4.8 km. (3 miles) 
per hour. 
3 5 3 4 8 12 18 
Sampling and readings ......... .............. .............. 2 2 2 2 2 
Walks at 4.8 km. (3 miles) 
per hour. 
.............. .............. 3 5 8 12 18 
Sampling and readings ......... .............. .............. 2 2 2 2 2 
Walks at 4.8 km. (3 miles) 
per hour. 
.............. .............. .............. .............. 6 13 16 
Sampling and readings ......... .............. .............. .............. .............. 2 2 2 

TABLE 2�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 2, IN MINUTES 

[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 2, 3 and 
4 hours 1 
Sampling and readings ................. 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Carries 23 kg. (50 pound) weight 
over overcast ............................. 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Climbs vertical treadmill 2 (or 
equivalent) ................................. 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Climbs vertical treadmill (or equivalent) 
.......................................... 
Sampling and readings ................. 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Climbs vertical treadmill (or equivalent) 
.......................................... 
Carries 23 kg. (50 pound) weight 
over overcast ............................. 
Sampling and readings ................. 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Climbs vertical treadmill (or equivalent) 
.......................................... 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
Climbs vertical treadmill (or equivalent) 
.......................................... 
Carries 20 kg. (45 pound) weight 
and walks at 4.8 km. (3 miles) 
per hour ..................................... 
Walks at 4.8 km. (3 miles) per 
hour ........................................... 
............ 
............ 
............ 
............ 
1 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
1 
1 
............ 
............ 
............ 
............ 
1 
1 
1 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
............ 
2 
................ 
1 
1 time in 
2 minutes 
................ 
1 
1 
................ 
................ 
................ 
................ 
................ 
2 
................ 
1 
2 
................ 
................ 
................ 
2 
1 
1 time in 
2 minutes 
1 
1 
................ 
................ 
................ 
2 
1 
1 time in 
2 minutes 
................ 
1 
1 
................ 
................ 
................ 
................ 
2 
3 
2 times in 
4 minutes 
3 
1 
................ 
................ 
2 
2 
1 
3 times in 
6 minutes 
................ 
3 
1 
................ 
................ 
................ 
................ 
2 
4 
3 times in 
6 minutes 
3 
1 
2 
1 
2 
3 
1 
4 times in 
8 minutes 
2 
3 
1 
2 
1 
................ 
1 
2 
6 
4 times in 
8 minutes 
3 
1 
3 
1 
2 
5 
1 
5 times in 
10 
minutes 
2 
3 
1 
3 
1 
2 
4 
2 
10. 
5 times in 
10 
minutes. 
5. 
1. 
5 
1. 
2. 
11. 
1. 
5 times in 
10 
minutes. 
2. 
................ 
Then 
repeat 
above 
activities 
once. 
................ 
................ 
................ 

565 




Pt. 84, Subpt. H, Tables 42 CFR Ch. I (10�1�10 Edition) 

TABLE 2�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 2, IN MINUTES�Continued 
[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 2, 3 and 
4 hours 1 
Sampling and readings ................. ............ ............ ................ 2 2 2 2 ................ 

1 Total test time for Test 2 for 2-hour, 3-hour, and 4-hour apparatus is 2 hours. 
2 Treadmill shall be inclined 15� from vertical and operated at a speed of 1 foot per second. 


TABLE 3�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 3, IN MINUTES 
[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 
2, 3 and 
4 
hours 1 
Sampling and readings ......................... .............. .............. .............. 2 2 2 2 (2) 
Walks at 4.8 km. (3 miles) per hour ..... .............. .............. 1 1 2 2 3 .............. 
Runs at 9.7 km. (6 miles) per hour ...... 1 1 1 1 1 1 1 .............. 
Pulls 20 kg. (45 pound) weight to 5 
feet ..................................................... .............. 15 times 
in 1 
minute 
.............. 30 times 
in 2 
minutes 
30 times 
in 2 
minutes 
30 times 
in 2 
minutes 
60 times 
in 6 
minutes 
.............. 
Lies on side ........................................... 1/2 1 1 2 3 4 5 .............. 
Lies on back .......................................... 1/2 1 1 2 2 3 3 .............. 
Crawls on hands and knees ................. 1 1 1 2 2 2 2 .............. 
Sampling and readings ......................... .............. .............. 2 .............. 2 2 2 .............. 
Runs at 9.7 km. (6 miles) per hour ...... .............. .............. .............. 1 1 1 1 .............. 
Walks at 4.8 km. (3 miles) per hour ..... .............. .............. .............. .............. 2 8 10 .............. 
Pulls 20 kg. (45 pound) weight to 5 
feet ..................................................... .............. .............. 30 times 
in 2 
minutes 
.............. 60 times 
in 6 
minutes 
60 times 
in 6 
minutes 
60 times 
in 6 
minutes 
.............. 
Sampling and readings ......................... .............. .............. .............. 2 .............. 2 2 .............. 
Walks at 4.8 km. (3 miles) per hour ..... .............. .............. 1 .............. 3 4 10 .............. 
Lies on side ........................................... .............. .............. .............. .............. .............. 2 4 .............. 
Lies on back .......................................... .............. .............. .............. .............. .............. 2 1 .............. 
Sampling and readings ......................... .............. .............. .............. .............. 2 2 2 .............. 

1 Total test time for Test 3 for 2-hour, 3-hour, and 4-hour apparatus is 2 hours. 
2 Perform test No. 3 for 1 hr. apparatus; then perform test No. 1 for 1 hour apparatus. 

TABLE 4�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 4, IN MINUTES 
[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 2 hours 3 hours 4 hours 
Sampling and 
readings ......... .............. .............. .............. 2 2 2 2 (2) (3) (4) 
Walks at 4.8 km. 
(3 miles) per 
hour ............... .............. .............. .............. 1 2 2 2 .............. .............. .............. 
Climbs vertical 
treadmill 1 (or 
equivalent) ..... 1 1 1 1 1 1 1 .............. .............. .............. 
Walks at 4.8 km. 
(3 miles) per 
hour ............... .............. 1 1 1 2 2 2 .............. .............. .............. 
Pulls 20 kg. (45 
pound) weight 
to 5 feet ......... .............. 30 times 
in 2 
minutes 
30 times 
in 2 
minutes 
30 times 
in 2 
minutes 
60 times 
in 5 
minutes 
60 times 
in 5 
minutes 
60 times 
in 5 
minutes 
.............. .............. .............. 
Walks at 4.8 km. 
(3 miles) per 
hour ............... .............. .............. 1 1 1 2 3 .............. .............. .............. 

566 




Public Health Service, HHS � 84.110 

TABLE 4�DURATION AND SEQUENCE OF SPECIFIC ACTIVITIES FOR TEST 4, IN MINUTES�Continued 
[42 CFR part 84, subpart H] 

Activity 
Service time� 
3 minutes 
5 minutes 
10 minutes 
15 minutes 
30 minutes 
45 minutes 
1 hour 2 hours 3 hours 4 hours 
Carries 23 kg. 
(50 pound) 
weight over 
overcast ......... 
Sampling and 
readings ......... 
Walks at 4.8 km. 
(3 miles) per 
hour ............... 
Runs at 9.7 km. 
(6 miles) per 
hour ............... 
Carries 23 kg. 
(50 pound) 
weight over 
overcast ......... 
Pulls 20 kg (45 
pound) weight 
to 5 feet ......... 
Sampling and 
readings ......... 
Walks at 4.8 km. 
(3 miles) per 
hour ............... 
Pulls 20 kg. (45 
pound) weight 
to 5 feet ......... 
Carries 20 kg. 
(45 pound) 
weight and 
walks at 4.8 
km. (3 miles) 
per hour ......... 
Sampling and 
readings ......... 
.............. 
.............. 
.............. 
.............. 
.............. 
15 times 
in 1 
minute 
.............. 
1 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
1 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
2 
.............. 
1 
1 time in 
1 minute 
.............. 
.............. 
1 
.............. 
.............. 
.............. 
1 time in 
1 minute 
.............. 
1 
1 
1 time in 
1 minute 
15 times 
in 1 
minute 
2 
.............. 
.............. 
.............. 
.............. 
1 time in 
1 minute 
2 
3 
1 
2 times 
in 3 
minutes 
60 times 
in 5 
minutes 
2 
.............. 
.............. 
.............. 
.............. 
2 times 
in 3 
minutes 
2 
3 
1 
4 times 
in 6 
minutes 
30 times 
in 2 
minutes 
2 
2 
60 times 
in 5 
minutes 
3 
2 
4 times 
in 8 
minutes 
2 
4 
1 
6 times 
in 9 
minutes 
36 times 
in 3 
minutes 
2 
6 
60 times 
in 5 
minutes 
3 
2 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 
.............. 

1 Treadmill shall be inclined 15� from vertical and operated at a speed of 30 cm. (1 foot) per second. 

2 Perform test No. 1 for 30-minute apparatus; then perform test No. 4 for 1-hour apparatus; then perform test No. 1 for 30-
minute apparatus. 

3 Perform test No. 1 for 1-hour apparatus; then perform test No. 4 for 1-hour apparatus; then perform test No. 1 for 1-hour apparatus. 


4 Perform test No. 1 for 1-hour apparatus; then perform test No. 4 for 1-hour apparatus; then perform test No. 1 for 1-hour apparatus 
twice (i.e., two one-hour tests). 

Subpart I�Gas Masks 

� 84.110 Gas masks; description. 

(a) Gas masks including all completely 
assembled air purifying masks 
designed for use as respiratory protection 
during entry into atmospheres not 
immediately dangerous to life or 
health or escape only from hazardous 
atmospheres containing adequate oxygen 
to support life are described as follows: 


(1) Front-mounted or back-mounted gas 
mask. A gas mask which consists of a 
full facepiece, a breathing tube, a canister 
at the front or back, a canister 
harness, and associated connections. 
(2) Chin-style gas mask. A gas mask 
which consists of a full facepiece, a 
canister which is usually attached to 
the facepiece, and associated connections. 


567 




� 84.111 

(3) Escape gas mask. A gas mask designed 
for use during escape only from 
hazardous atmospheres which consists 
of a facepiece or mouthpiece, a canister, 
and associated connections. 
(b) Gas masks shall be further described 
according to the types of gases 
or vapors against which they are designed 
to provide respiratory protection, 
as follows: 
Type of front-mounted or back-mounted gas mask: 

Acid gas 1,2,3 

Ammonia 

Carbon monoxide 

Organic Vapor 1,2,3 

Other gas(es) and vapor(s) 1,2,3 

Combination of two or more of the above gases 

and vapors. 1,2,3 

Combination of acid gas, ammonia, carbon mon


oxide, and organic vapors. 1,2,3 
Type of chin-style gas mask: 
Acid gas 1,2,3 
Ammonia 
Carbon monoxide 
Organic vapor 1,2,3 
Other gas(es) and vapor 1,2,3 
Combination of two or more of the above gases 

and vapors. 1,2,3 
Type of escape gas mask: 

Acid gas 1,2,3,4 

Ammonia 4 

Carbon monoxide 

Organic vapor 1,2,3,4 

Other gas(s) and vapor(s) 1,2,3,4 

Combination of two or more of the above gases 

and vapors. 1,2,3,4 

1 Approval may be for acid gases or organic vapors as a 
class or for specific acid gases or organic vapors. 

2 Not for use against gases or vapors with poor warning 
properties (except where MSHA or Occupational Safety and 
Health Administration standards permit such use for a specific 
gas or vapor), or those which generate high heats or reaction 
with sorbent materials in the canister. 

3 Use of the gas mask may be limited by factors such as 
lower explosive limit, toxicological effects, and facepiece fit. 
Limitations on gas mask service life and sorbent capacity 
limitations shall be specified by the applicant in instructions 
for selection, use and maintenance of the gas mask. 

4 Eye protection may be required in certain concentrations 
of gases and vapors. 

(c) Gas masks for respiratory protection 
against gases and vapors other 
than those specified in paragraph (b) of 
this section, may be approved upon 
submittal of an application in writing 
for approval to the Certification and 
Quality Assurance Branch listing the 
gas or vapor and suggested maximum 
use concentration for the specific type 
of gas mask. The Institute will consider 
the application and accept or reject 
it on the basis of effect on the 
wearer�s health and safety and any 
field experience in use of gas masks for 
such exposures. If the application is ac42 
CFR Ch. I (10�1�10 Edition) 

cepted, the Institute will test such 
masks in accordance with the requirements 
of this subpart. 

� 84.111 Gas masks; required components. 


(a) Each gas mask described in 
� 84.110 shall, where its design requires, 
contain the following component parts: 
(1) Facepiece or mouthpiece and 
noseclip; 
(2) Canister or cartridge; 
(3) Canister harness; 
(4) External check valve; and 
(5) Breathing tube. 
(b) The components of each gas mask 
shall meet the minimum construction 
requirements set forth in subpart G of 
this part. 
� 84.112 Canisters and cartridges in 
parallel; resistance requirements. 

Where two or more canisters or cartridges 
are used in parallel, their resistance 
to airflow shall be essentially 
equal. 

� 84.113 Canisters and cartridges; 
color and markings; requirements. 

The color and markings of all canisters 
and cartridges or labels shall 
conform with the requirements of the 
American National Standards Institute, 
American National Standard for 
Identification of Air-Purifying Respirator 
Canisters and Cartridges, ANSI 
K13.1�1973. ANSI K13.1 is incorporated 
by reference and has been approved by 
the Director of the Federal Register in 
accordance with 5 U.S.C. 552(a) and 1 
CFR part 51. Copies may be obtained 
from American National Standards Institute, 
Inc., 1430 Broadway, New York, 
NY 10018. Copies may be inspected at 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888, or 
at the National Archives and Records 
Administration (NARA). For information 
on the availability of this material 
at NARA, call 202�741�6030, or go 
to: http://www.archives.gov/ 
federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 

568 




Public Health Service, HHS 

� 84.114 Filters used with canisters 
and cartridges; location; replacement. 


(a) Particulate matter filters used in 
conjunction with a canister or cartridge 
shall be located on the inlet side 
of the canister or cartridge. 
(b) Filters shall be incorporated in or 
firmly attached to the canister or cartridge 
and each filter assembly shall, 
where applicable, be designed to permit 
its easy removal from and replacement 
in the canister or cartridge. 
� 84.115 Breathing tubes; minimum requirements. 


Flexible breathing tubes used in conjunction 
with gas masks shall be designed 
and constructed to prevent: 

(a) Restriction of free head movement; 
(b) Disturbance of the fit of 
facepieces or mouthpieces; 
(c) Interference with the wearer�s activities; 
and 
(d) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.116 Harnesses; installation and 
construction; minimum requirements. 


(a) Each gas mask shall, where necessary, 
be equipped with a suitable harness 
designed and constructed to hold 
the components of the gas mask in position 
against the wearer�s body. 
(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of gas mask parts, and 
where applicable, provide for holding a 
full facepiece in the ready position 
when not in use. 
� 84.117 Gas mask containers; minimum 
requirements. 

(a) Gas masks shall be equipped with 
a substantial, durable container bearing 
markings which show the applicant�s 
name, the type and commercial 
designation of mask it contains and all 
appropriate approval labels. 
(b) Containers for gas masks shall be 
designed and constructed to permit 
easy removal of the mask. 
� 84.120 

� 84.118 Half-mask facepieces, full 
facepieces, and mouthpieces; fit; 
minimum requirements. 

(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Full facepieces shall provide for 
optional use of corrective spectacles or 
lenses, which shall not reduce the respiratory 
protective qualities of the gas 
mask. 
(c) Half-mask facepieces shall not 
interfere with the fit of common industrial 
safety spectacles, as determined 
by the Institute�s facepiece tests in 
� 84.124. 
(d) Gas masks with mouthpieces shall 
be equipped with noseclips which are 
securely attached to the mouthpiece or 
gas mask and provide an airtight seal. 
(e) Facepieces shall be designed to 
prevent eyepiece fogging. 
� 84.119 Facepieces; eyepieces; minimum 
requirements. 

(a) Full facepieces shall be designed 
and constructed to provide adequate vision 
which is not distorted by the eye. 
(b) All eyepieces shall be designed 
and constructed to be impact and penetration 
resistant. Federal Specification, 
Mask, Air Line: and Respirator, 
Air Filtering, Industrial, GGG-M-125d, 
October 11, 1965 with interim amendment-
1, July 30, 1969, is an example of 
an appropriate standard for determining 
impact and penetration resistance. 
Copies of GGG-M-125d may be obtained 
from the NIOSH, Certification 
and Quality Assurance Branch, 1095 
Willowdale Road, Morgantown, WV 
26505�2888. 
� 84.120 Inhalation and exhalation 
valves; minimum requirements. 

(a) Inhalation and exhalation valves 
shall be provided where necessary and 
protected against damage and distortion. 
569 




� 84.121 

(b) Inhalation valves shall be designed 
and constructed to prevent excessive 
exhaled air from adversely affecting 
cartridges, canisters, and filters. 
(c) Exhalation valves shall be protected 
against external influence, and 
designed and constructed to prevent inward 
leakage of contaminated air. 
� 84.121 Head harnesses; minimum requirements. 


(a) Facepieces shall be equipped with 
adjustable and replaceable head harnesses, 
designed and constructed to 
provide adequate tension during use 
and an even distribution of pressure 
over the entire area in contact with 
the face. 
42 CFR Ch. I (10�1�10 Edition) 

(b) Mouthpieces shall be equipped, 
where applicable, with adjustable and 
replaceable harnesses designed and 
constructed to hold the mouthpiece in 
place. 
� 84.122 Breathing resistance test; minimum 
requirements. 

(a) Resistance to airflow will be 
measured in the facepiece or mouthpiece 
of a gas mask mounted on a 
breathing machine both before and 
after each test conducted in accordance 
with �� 84.124, 84.125, and 84.126, with air 
flowing at a continuous rate of 85 liters 
per minute. 
(b) The maximum allowable resistance 
requirements for gas masks are as 
follows: 
MAXIMUM RESISTANCE 

[mm. water-column height] 

Type of gas mask 
Inhalation 
Exhalation 
Initial Final 1 
Front-mounted or back-mounted (without particulate filter) .......................................... 
Front-mounted or back-mounted (with approved particulate filter) ............................... 
Chin-style (without particulate filter) .............................................................................. 
Chin-style (with approved particulate filter) ................................................................... 
Escape (without particulate filter) .................................................................................. 
Escape (with approved particulate filter) ....................................................................... 
60 
70 
40 
65 
60 
70 
75 
85 
55 
80 
75 
85 
20 
20 
20 
20 
20 
20 

1 Measured at end of the service life specified in Tables 5, 6, and 7 of this subpart. 

� 84.123 Exhalation valve leakage test. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. water-column height while in a 
normal operating position. 
(b) Leakage between the valve and 
valve seat shall not exceed 30 milliliters 
per minute. 
� 84.124 Facepiece tests; minimum requirements. 


(a) The complete gas mask will be 
fitted to the faces of persons having 
varying facial shapes and sizes. 
(b) Where the applicant specifies a 
facepiece size or sizes for the gas mask, 
together with the approximate measurements 
of faces they are designed to 
fit, the Institute will insure that test 
subjects suit such facial measurements. 
(c) Any gas mask parts which must 
be removed to perform the facepiece or 
mouthpiece fit test shall be replaceable 
without special tools and without disturbing 
the facepiece or mouthpiece 
fit. 

(d) The facepiece or mouthpiece fit 
test, using positive or negative pressure 
recommended by the applicant 
and described in his instructions will 
be used before each test specified in 
paragraph (e) of this section, and in 
� 84.125. 
(e)(1) Each wearer will enter a chamber 
containing 100 p.p.m. isoamyl acetate 
vapor for a half-mask facepiece 
and 1,000 p.p.m. isoamyl acetate vapor 
for a full facepiece or mouthpiece. 

(2) The facepiece or mouthpiece may 
be adjusted, if necessary, in the test 
chamber before starting the tests. 
(3) Each wearer will remain in the 
chamber for 8 minutes while performing 
the following activities: 
(i) Two minutes, nodding and turning 
head; 
(ii) Two minutes, calisthenic arm 
movements; 
(iii) Two minutes, running in place; 
and 
570 




Public Health Service, HHS 

(iv) Two minutes, pumping with a 
tire pump into a 28 liter (1 cubic foot) 
container. 
(4) Each wearer shall not detect the 
odor of isoamyl acetate during the 
test. 
� 84.125 Particulate tests; canisters 

containing particulate filters; min


imum requirements. 

Gas mask canisters containing filters 
for protection against particulates (e.g. 
dusts, fumes, mists, and smokes) in 
combination with gases, vapors, or 
gases and vapors, shall also comply 
with the requirements as prescribed in 
�� 84.170 through 84.183, except for the 
airflow resistance test of � 84.181. 

� 84.126 Canister bench tests; minimum 
requirements. 

(a)(1) Bench tests, except for carbon 
monoxide tests, will be made on an apparatus 
that allows the test atmosphere 
at 50 �5 percent relative humidity 
and room temperature (25 �2.5 �C.) 
to enter the canister continuously at 
concentrations and rates of flow specified 
in Tables 5, 6, and 7 of this subpart. 

(2) Three canisters will be removed 
from containers and tested as received 
from the applicant. 
(3) Two canisters, other than those 
described in paragraph (a)(2) of this 
section, will be equilibrated at room 
temperature by passing 25 percent relative 
humidity air through them at 64 
liters per minute for 6 hours. 
(4) Two canisters, other than those 
described in paragraphs (a) (2) and (3) 
Pt. 84, Subpt. I, Tables 

of this section, will be equilibrated at 
room temperature by passing 85 percent 
relative humidity air through 
them at 64 liters per minute for 6 
hours. 

(5) The equilibrated canisters will be 
resealed, kept in an upright position at 
room temperature, and tested within 18 
hours. 
(b) Front-mounted and back-mounted 
gas mask canisters will be tested and 
shall meet the minimum requirements 
set forth in Table 5 of this subpart. 
(c)(1) Front-mounted, and back-
mounted, and chin-style canisters designated 
as providing respiratory protection 
against gases, ammonia, organic 
vapors, carbon monoxide and particulate 
contaminants shall have a 
window or other indicator to warn the 
gas mask wearer when the canister will 
no longer satisfactorily remove carbon 
monoxide from the inhaled air. 

(2) Other types of front- and back-
mounted canisters may also be 
equipped with a window or other indicator 
to warn of imminent leakage of 
other gases or vapors. 
(3) The window indicator canisters 
will be tested as regular canisters, but 
shall show a satisfactory indicator 
change or other warning before the allowable 
canister penetration has occurred. 
(d) Chin-style gas mask canisters 
shall meet the minimum requirements 
set forth in Table 6 of this subpart. 
(e) Escape gas mask canisters shall 
meet the minimum requirements set 
forth in Table 7 of this subpart. 
TABLES TO SUBPART I OF PART 84 

TABLE 5�CANISTER BENCH TESTS AND REQUIREMENTS FOR FRONT-MOUNTED AND BACK-MOUNTED 
GAS MASK CANISTERS 
[42 CFR part 84, subpart I] 


Canister type Test condition 
Test atmosphere 
Number 
of tests 
Maximum 
allowable 
penetratin 
(parts per 
million) 
Minimum 
service 
life (minutes) 
1Gas or vapor 
Concentration 
(parts 
per million) 
Flow rate 
(liters per 
minute) 
Acid gas ..................................... As received SO2 20,000 64 3 5 12 
Equilibrated Cl2 20,000 64 3 5 12 
SO2 20,000 32 4 5 12 
Organic vapor ............................ As received 
Cl2 
CCl4 
20,000 
20,000 
32 
64 
4 
3 
5 
5 
12 
12 
Equilibrated CCl4 20,000 32 4 5 12 
Ammonia .................................... As received NH3 30,000 64 3 50 12 
Equilibrated NH3 30,000 32 4 50 12 
Carbon monoxide ...................... As received CO 20,000 4 64 2 (3) 60 

571 




Pt. 84, Subpt. I, Tables 42 CFR Ch. I (10�1�10 Edition) 

TABLE 5�CANISTER BENCH TESTS AND REQUIREMENTS FOR FRONT-MOUNTED AND BACK-MOUNTED 
GAS MASK CANISTERS�Continued 
[42 CFR part 84, subpart I] 


Canister type Test condition 
Test atmosphere 
Number 
of tests 
Maximum 
allowable 
penetratin 
(parts per 
million) 
Minimum 
service 
life (minutes) 
1Gas or vapor 
Concentration 
(parts 
per million) 
Flow rate 
(liters per 
minute) 
Equilibrated CO 5,000 2 32 3 (3) 60 
CO 3,000 2 32 3 (3) 60 
Combination of 2 or 3 of above 
types 5 
Combination of all above types 6 

1 Minimum life will be determined at the indicated penetration. 
2 Relative humidity of test atmosphere will be 95 �3pct; temperature of test atmosphere will be 25 �2.5 �C. 
3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m dur


ing this time. 
4 Relative humidity of test atmosphere will be 95 �3pct; temperature of test atmosphere entering the test fixture will be 0 �2.5 

�C�0 �C. 
5 Test conditions and requirements will be applicable as shown in this table. 
6 Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, or


ganic vapor, and ammonia will be 6 min instead of 12 min. 

TABLE 6�CANISTER BENCH TESTS AND REQUIREMENTS FOR CHIN-STYLE GAS MASK CANISTERS 
[42 CFR part 84, subpart I] 

Canister type Test condition 
Test atmosphere 
Number 
of tests 
Maximum 
allowable 
penetration 
(parts 
per million) 
Minimum 
service 
life (minutes) 
1Gas or vapor 
Concentration 
(parts 
per million) 
Flow rate 
(liters per 
minute) 
Acid gas ....................... As received Equilibrated 
SO2 50,000 64 3 5 12 
Cl2 5,000 64 3 5 12 
SO2 5,000 32 4 5 12 
Cl2 5,000 32 4 5 12 
Organic vapor .............. As received Equilibrated 
CCl4 5,000 64 3 5 12 
CCl4 5,000 32 4 5 12 
Ammonia ..................... As received Equilibrated 
NH3 5,000 64 3 50 12 
As received Equilibrated 
NH3 5,000 32 4 50 12 
Carbon monoxide ........ As received CO 20,000 2 64 2 (3) 60 
CO 5,000 4 32 3 (3) 60 
Combination of 2 or 3 
of above types 5 
Combination of all 
above types 6 
CO 3,000 2 32 3 (3) 60 

1 Minimum life will be determined at the indicated penetration. 
2 Relative humidity of test atmosphere will be 95 �3pct; temperature of test atmosphere will be 25 �2.5 �C. 
3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m dur


ing this time. 
4 Relative humidity of test atmosphere will be 95 �3pct; temperature of test atmosphere entering the test fixture will be 0 �2.5 

�C�0 �C. 
5 Test conditions and requirements will be applicable as shown in this table. 
6 Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, or


ganic vapor, and ammonia will be 6 min instead of 12 min. 

TABLE 7�CANISTER BENCH TESTS AND REQUIREMENTS FOR ESCAPE GAS MASK CANISTERS 
[42 CFR part 84, subpart I] 

Test atmosphere Maximum 
allowable Minimum 
Canister type Test condition 
Gas or vapor 
Concentration 
(parts 
per million) 
Flow rate 
(liters per 
minute) 
Number 
of tests 
penetration 
(parts 
per million) 
service 
life (minutes) 
1 
Acid gas ....................... As received ................ SO2 5,000 64 3 5 12 
Equilibrated ................ Cl2 
SO2 
5,000 
5,000 
64 
32 
3 
4 
5 
5 
12 
12 
Cl2 5,000 32 4 5 12 

572 




Public Health Service, HHS � 84.130 

TABLE 7�CANISTER BENCH TESTS AND REQUIREMENTS FOR ESCAPE GAS MASK CANISTERS� 
Continued 
[42 CFR part 84, subpart I] 


Test atmosphere Maximum 
allowable Minimum 
Canister type Test condition 
Gas or vapor 
Concentration 
(parts 
per million) 
Flow rate 
(liters per 
minute) 
Number 
of tests 
penetration 
(parts 
per million) 
service 
life (minutes) 
1 
Organic vapor .............. 
Ammonia ..................... 
As received ................ 
Equilibrated ................ 
As received ................ 
CCl4 
CCl4 
NH3 
5,000 
5,000 
5,000 
64 
32 
64 
3 
4 
3 
5 
5 
50 
12 
12 
12 
Carbon monoxide ........ 
Equilibrated ................ 
As received ................ 
NH3 
CO 
CO 
CO 
5,000 
10,000 
5,000 
3,000 
32 
2 32 
5 32 
2 32 
4 
2 
3 
3 
50 
(3) 
(3) 
(3) 
12 
4 60 
60 
60 

1 Minimum life will be determined at the indicated penetration. 

2 Relative humidity of test atmosphere will be 95 �3 pct; temperature of test atmosphere will be 25 �2.5 �C. 

3 Maximum allowable CO penetration will be 385 cm 3 during the minimum life. The penetration shall not exceed 500 p/m during 
this time. 

4 If effluent temperature exceeds 100 �C during this test, the escape gas mask shall be equipped with an effective heat exchanger. 


5 Relative humidity of test atmosphere will be 95 �3 pct; temperature of test atmosphere entering the test fixture will be 0 �2.5 
�C�0 �C. 

Subpart J�Supplied-Air
Respirators 


� 84.130 Supplied-air respirators; description. 


Supplied-air respirators, including 
all completely assembled respirators 
designed for use as respiratory protection 
during entry into and escape from 
atmospheres not immediately dangerous 
to life or health are described as 
follows: 

(a) Type ��A�� supplied-air respirators. A 
hose mask respirator, for entry into 
and escape from atmospheres not immediately 
dangerous to life or health, 
which consists of a motor-driven or 
hand-operated blower that permits the 
free entrance of air when the blower is 
not operating, a strong large-diameter 
hose having a low resistance to airflow, 
a harness to which the hose and the 
life-line are attached and a tight-fitting 
facepiece. 
(b) Type ��AE�� supplied-air respirators. 
A Type ��A�� supplied-air respirator 
equipped with additional devices designed 
to protect the wearer�s head and 
neck against impact and abrasion from 
rebounding abrasive material, and with 
shielding material such as plastic, 
glass, woven wire, sheet metal, or 
other suitable material to protect the 
window(s) of facepieces, hoods, and helmets 
which do not unduly interfere 
with the wearer�s vision and permit 
easy access to the external surface of 
such window(s) for cleaning. 

(c) Type ��B�� supplied-air respirators. A 
hose mask respirator, for entry into 
and escape from atmospheres not immediately 
dangerous to life or health, 
which consists of a strong large-diameter 
hose with low resistance to airflow 
through which the user draws inspired 
air by means of his lungs alone, a harness 
to which the hose is attached, and 
a tight-fitting facepiece. 
(d) Type ��BE�� supplied-air respirators. 
A type ��B�� supplied-air respirator 
equipped with additional devices designed 
to protect the wearer�s head and 
neck against impact and abrasion from 
rebounding abrasive material, and with 
shielding material such as plastic, 
glass, woven wire, sheet metal, or 
other suitable material to protect the 
window(s) of facepieces, hoods, and helmets 
which do not unduly interfere 
with the wearer�s vision and permit 
easy access to the external surface of 
such window(s) for cleaning. 
(e) Type ��C�� supplied-air respirators. 
An airline respirator, for entry into 
and escape from atmospheres not immediately 
dangerous to life or health, 
which consists of a source of respirable 
breathing air, a hose, a detachable coupling, 
a control valve, orifice, a demand 
valve or pressure demand valve, 
an arrangement for attaching the hose 
to the wearer, and a facepiece, hood, or 
helmet. 
573 




� 84.131 

(f) Type ��CE�� supplied-air respirators. 
A type ��C�� supplied-air respirator 
equipped with additional devices designed 
to protect the wearer�s head and 
neck against impact and abrasion from 
rebounding abrasive material, and with 
shielding material such as plastic, 
glass, woven wire, sheet metal, or 
other suitable material to protect the 
window(s) of facepieces, hoods, and helmets 
which do not unduly interfere 
with the wearer�s vision and permit 
easy access to the external surface of 
such window(s) for cleaning. 
� 84.131 Supplied-air respirators; required 
components. 

(a) Each supplied-air respirator described 
in � 84.130 shall, where its design 
requires, contain the following 
component parts: 
(1) Facepiece, hood, or helmet; 
(2) Air supply valve, orifice, or demand 
or pressure-demand regulator; 
(3) Hand operated or motor driven air 
blower; 
(4) Air supply hose; 
(5) Detachable couplings; 
(6) Flexible breathing tube; and 
(7) Respirator harness. 
(b) The component parts of each sup-
plied-air respirator shall meet the minimum 
construction requirements set 
forth in subpart G of this part. 
� 84.132 Breathing tubes; minimum requirements. 


Flexible breathing tubes used in conjunction 
with supplied-air respirators 
shall be designed and constructed to 
prevent: 

(a) Restriction of free head movement; 
(b) Disturbance of the fit of 
facepieces, mouthpieces, hoods, or helmets; 
(c) Interference with the wearer�s activities; 
and 
(d) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.133 Harnesses; installation and 
construction; minimum requirements. 


(a) Each supplied-air respirator shall, 
where necessary, be equipped with a 
suitable harness designed and constructed 
to hold the components of the 
42 CFR Ch. I (10�1�10 Edition) 

respirator in position against the wearer�s 
body. 

(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of respirator parts, 
and where applicable, provide for holding 
a full facepiece in the ready position 
when not in use. 
� 84.134 Respirator containers; minimum 
requirements. 

Supplied-air respirators shall be 
equipped with a substantial, durable 
container bearing markings which 
show the applicant�s name, the type 
and commercial designation of the respirator 
it contains, and all appropriate 
approval labels. 

� 84.135 Half-mask facepieces, full 
facepieces, hoods, and helmets; fit; 
minimum requirements. 

(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Full facepieces shall provide for 
optional use of corrective spectacles or 
lenses, which shall not reduce the respiratory 
protective qualities of the respirator. 
(c) Hoods and helmets shall be designed 
and constructed to fit persons 
with various head sizes, provide for the 
optional use of corrective spectacles or 
lenses, and insure against any restriction 
of movement by the wearer. 
(d) Facepieces, hoods, and helmets 
shall be designed to prevent eyepiece 
fogging. 
� 84.136 Facepieces, hoods, and helmets; 
eyepieces; minimum requirements. 


(a) Facepieces, hoods, and helmets 
shall be designed and constructed to 
provide adequate vision which is not 
distorted by the eyepiece. 
(b) All eyepieces except those on 
Types B, BE, C, and CE supplied-air 
respirators shall be designed and constructed 
to be impact and penetration 
resistant. Federal Specification, Mask, 
Air Line: and Respirator, Air Filtering, 
574 




Public Health Service, HHS 

Industrial, GGG-M-125d, October 11, 
1965 with interim amendment-1, July 
30, 1969, is an example of an appropriate 
standard for determining impact and 
penetration resistance. Copies of GGG-
M-125d may be obtained from the 
NIOSH, Certification and Quality Assurance 
Branch, 1095 Willowdale Road, 
Morgantown, WV 26505�2888. 

(c)(1) The eyepieces of AE, BE, and 
CE type supplied-air respirators shall 
be shielded by plastic, glass, woven 
wire, sheet metal, or other suitable 
material which does not interfere with 
the vision of the wearer. 

(2) Shields shall be mounted and attached 
to the facepiece to provide easy 
access to the external surface of the 
eyepiece for cleaning. 
� 84.137 Inhalation and exhalation 

valves; check valves; minimum re


quirements. 

(a) Inhalation and exhalation valves 
shall be provided where necessary and 
protected against distortion. 
(b) Exhalation valves shall be: 
(1) Protected against damage and external 
influence; and 
(2) Designed and constructed to prevent 
inward leakage of contaminated 
air. 
(c) Check valves designed and constructed 
to allow airflow toward the 
facepiece only shall be provided in the 
connections to the facepiece or in the 
hose fitting near the facepiece of all 
Type A, AE, B, and BE supplied-air respirators. 
� 84.138 Head harnesses; minimum requirements. 


Facepieces shall be equipped with adjustable 
and replaceable head harnesses 
which are designed and constructed 
to provide adequate tension 
during use, and an even distribution of 
pressure over the entire area in contact 
with the face. 

� 84.139 Head and neck protection; 

supplied-air respirators; minimum

requirements. 

Type AE, BE, and CE supplied-air 
respirators shall be designed and constructed 
to provide protection against 
impact and abrasion from rebounding 
abrasive materials to the wearer�s head 
and neck. 

� 84.141 

� 84.140 Air velocity and noise levels; 

hoods and helmets; minimum re


quirements. 

Noise levels generated by the respirator 
will be measured inside the 
hood or helmet at maximum airflow 
obtainable within pressure and hose 
length requirements and shall not exceed 
80 dBA. 

� 84.141 Breathing gas; minimum requirements. 


(a) Breathing gas used to supply sup-
plied-air respirators shall be respirable 
breathing air and contain no less than 
19.5 volume-percent of oxygen. 
(b) Compressed, gaseous breathing air 
shall meet the applicable minimum 
grade requirements for Type I gaseous 
air set forth in the Compressed Gas Association 
Commodity Specification for 
Air, G�7.1, 1966 (Grade D or higher quality). 
G�7.1 is incorporated by reference 
and has been approved by the Director 
of the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from American 
National Standards Institute, Inc., 1430 
Broadway, New York, NY 10018. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 
(c) Compressed, liquefied breathing 
air shall meet the applicable minimum 
grade requirements for Type II liquid 
air set forth in the Compressed Gas Association 
Commodity Specification for 
Air, G�7.1, 1966 (Grade B or higher quality). 
G�7.1 is incorporated by reference 
and has been approved by the Director 
of the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from American 
National Standards Institute, Inc., 1430 
Broadway, New York, NY 10018. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
575 




� 84.142 

(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 

� 84.142 Air supply source; hand-operated 
or motor driven air blowers; 
Type A supplied-air respirators;
minimum requirements. 

(a) Blowers shall be designed and constructed 
to deliver an adequate amount 
of air to the wearer with either direction 
of rotation, unless constructed to 
permit rotation in one direction only, 
and to permit the free entrance of air 
to the hose when the blower is not operated. 
(b) No multiple systems, whereby 
more than one user is supplied by one 
blower, will be approved, unless each 
hose line is connected directly to a 
manifold at the blower. 
� 84.143 Terminal fittings or chambers;
Type B supplied-air respirators;
minimum requirements. 

(a) Blowers or connections to air supplies 
providing positive pressures shall 
not be approved for use on Type B sup-
plied-air respirators. 
(b) Terminal fittings or chambers 
employed in Type B supplied-air respirators, 
shall be: 
(1) Installed in the inlet of the hose. 
(2) Designed and constructed to provide 
for the drawing of air through corrosion 
resistant material arranged so 
as to be capable of removing material 
larger than 0.149 mm. in diameter (149 
micrometers, 100-mesh, U.S. Standard 
sieve). 
(3) Installed to provide a means for 
fastening or anchoring the fitting or 
chamber in a fixed position in a zone of 
respirable air. 
� 84.144 Hand-operated blower test; 
minimum requirements. 

(a) Hand-operated blowers shall be 
tested by attaching them to a mechanical 
drive and operating them 6 to 8 
hours daily for a period of 100 hours at 
a speed necessary to deliver 50 liters of 
air per minute through each completely 
assembled respirator. Each respirator 
shall be equipped with the maximum 
length of hose with which the device 
is to be approved and the hose 
42 CFR Ch. I (10�1�10 Edition) 

shall be connected to each blower or 
manifold outlet designed for hose connections. 


(b) The crank speed of the hand-operated 
blower shall not exceed 50 revolutions 
per minute in order to deliver the 
required 50 liters of air per minute to 
each facepiece. 
(c) The power required to deliver 50 
liters of air per minute to each wearer 
through the maximum length of hose 
shall not exceed one-fiftieth horsepower, 
and the torque shall not exceed 
a force of 2.3 kg. (5 pounds) on a 20 cm. 
(8-inch) crank, as defined in � 84.146. 
(d) The blower shall operate throughout 
the period without failure or indication 
of excessive wear of bearings or 
other working parts. 
� 84.145 Motor-operated blower test; 
minimum requirements. 

(a) Motor-operated blowers shall be 
tested by operating them at their specified 
running speed 6 to 8 hours daily 
for a period of 100 hours when assembled 
with the kind and maximum 
length of hose for which the device is 
to be approved and when connected to 
each blower or manifold outlet designed 
for hose connections. 
(b) The connection between the 
motor and the blower shall be so constructed 
that the motor may be disengaged 
from the blower when the 
blower is operated by hand. 
(c) The blower shall operate throughout 
the period without failure or indication 
of excessive wear of bearings or 
other working parts. 
(d) Where a blower, which is ordinarily 
motor driven, is operated by 
hand, the power required to deliver 50 
liters of air per minute to each wearer 
through the maximum length of hose 
shall not exceed one-fiftieth horsepower, 
and the torque shall not exceed 
a force of 2.3 kg. (5 pounds) on a 20 cm. 
(8-inch) crank, as defined in � 84.146. 
(e) Where the respirator is assembled 
with the facepiece and 15 m. (50 feet) of 
the hose for which it is to be approved, 
and when connected to one outlet with 
all other outlets closed and operated at 
a speed not exceeding 50 revolutions of 
the crank per minute, the amount of 
air delivered into the respiratory-inlet 
covering shall not exceed 150 liters per 
minute. 
576 




Public Health Service, HHS 

� 84.146 Method of measuring the 

power and torque required to oper


ate blowers. 

As shown in Figure 1 of this section, 
the blower crank is replaced by a wooden 
drum, a (13 cm. (5 inches) in diameter 
is convenient). This drum is wound 
with about 12 m. (40 feet) of No. 2 picture 
cord, b. A weight, c, of sufficient 
mass to rotate the blower at the desired 
speed is suspended from this wire 
cord. A mark is made on the cord about 
3 to 4.5 m. (10 to 15 feet) from the 
weight, c. Another mark is placed at a 
measured distance (6�9 m./20�30 feet is 

� 84.148 

convenient) from the first. These are 
used to facilitate timing. To determine 
the torque or horsepower required to 
operate the blower, the drum is started 
in rotation manually at or slightly 
above the speed at which the power 
measurement is to be made. The blower 
is then permitted to assume constant 
speed, and then as the first mark on 
the wire leaves the drum, a stopwatch 
is started. The watch is stopped when 
the second mark leaves the drum. 
From these data the foot-pounds per 
minute and the torque may be calculated. 


FIGURE 1�APPARATUS FOR MEASURING POWER REQUIRED TO OPERATE 
BLOWER. (42 CFR PART 84, SUBPART J, � 84.146) 



� 84.147 Type B supplied-air respirator; 
minimum requirements. 

No Type B supplied-air respirator 
shall be approved for use with a blower 
or with connection to an air supply device 
at positive pressures. 

� 84.148 Type C supplied-air respirator, 
continuous flow class; minimum 
requirements. 

(a) Respirators tested under this section 
shall be approved only when they 
577 




� 84.149 

supply respirable air at the pressures 
and quantities required. 

(b) The pressure at the inlet of the 
hose connection shall not exceed 863 
kN/m.2 (125 pounds per square inch 
gage). 
(c) Where the pressure at any point 
in the supply system exceeds 863 kN/ 
m.2 (125 pounds per square inch gage), 
the respirator shall be equipped with a 
pressure-release mechanism that will 
prevent the pressure at the hose connection 
from exceeding 863 kN/m.2 (125 
pounds per square inch gage) under any 
conditions. 
� 84.149 Type C supplied-air respirator, 
demand and pressure demand 
class; minimum requirements. 


(a) Respirators tested under this section 
shall be approved only when used 
to supply respirable air at the pressures 
and quantities required. 
(b) The manufacturer shall specify 
the range of air pressure at the point of 
attachment of the air-supply hose to 
the air-supply system, and the range of 
hose length for the respirator. For example, 
he might specify that the respirator 
be used with compressed air at 
pressures ranging from 280�550 kN/m.2 
(40 to 80 pounds per square inch) with 
from 6 to 76 m. (15 to 250 feet) of air-
supply hose. 
(c) The specified air pressure at the 
point of attachment of the hose to the 
air-supply system shall not exceed 863 
kN/m.2 (125 pounds per square inch 
gage). 
(d)(1) Where the pressure in the air-
supply system exceeds 863 kN/m.2 (125 
pounds per square inch gage), the respirator 
shall be equipped with a pressure-
release mechanism that will prevent 
the pressure at the point of attachment 
of the hose to the air-supply 
system from exceeding 863 kN/m.2 (125 
pounds per square inch gage). 

(2) The pressure-release mechanism 
shall be set to operate at a pressure not 
more than 20 percent above the manufacturer�s 
highest specified pressure. 
For example, if the highest specified 
pressure is 863 kN/m.2 (125 pounds per 
square inch), the pressure-release 
mechanism would be set to operate at 
a maximum of 1,035 kN/m.2 (150 pounds 
per square inch). 
42 CFR Ch. I (10�1�10 Edition) 

� 84.150 Air-supply line tests; minimumrequirements. 

Air supply lines employed on Type A, 
Type B, and Type C supplied-air respirators 
shall meet the minimum test 
requirements set forth in Table 8 of 
this subpart. 

� 84.151 Harness test; minimum requirements. 


(a)(1) Shoulder straps employed on 
Type A supplied-air respirators shall be 
tested for strength of material, joints, 
and seams and must separately withstand 
a pull of 113 kg. (250 pounds) for 
30 minutes without failure. 

(2) Belts, rings, and attachments for 
life lines must withstand a pull of 136 
kg. (300 pounds) for 30 minutes without 
failure. 
(3) The hose shall be firmly attached 
to the harness so as to withstand a pull 
of 113 kg. (250 pounds) for 30 minutes 
without separating, and the hose attachments 
shall be arranged so that 
the pull or drag of the hose behind an 
advancing wearer does not disarrange 
the harness or exert pull upon the face-
piece. 
(4) The arrangement and suitability 
of all harness accessories and fittings 
will be considered. 
(b)(1) The harness employed on Type 
B supplied-air respirators shall not be 
uncomfortable, disturbing, or interfere 
with the movements of the wearer. 

(2) The harness shall be easily adjustable 
to various sizes. 
(3) The hose shall be attached to the 
harness in a manner that will withstand 
a pull of 45 kg. (100 pounds) for 30 
minutes without separating or showing 
signs of failure. 
(4) The design of the harness and attachment 
of the line shall permit dragging 
the maximum length of hose considered 
for approval over a concrete 
floor without disarranging the harness 
or exerting a pull on the facepiece. 
(5) The arrangement and suitability 
of all harness accessories and fittings 
will be considered. 
(c) The harness employed on Type C 
respirators shall be similar to that required 
on the Type B respirator, or, it 
may consist of a simple arrangement 
for attaching the hose to a part of the 
wearer�s clothing in a practical manner 
578 




Public Health Service, HHS 

that prevents a pull equivalent to dragging 
the maximum length of the hose 
over a concrete floor from exerting pull 
upon the respiratory-inlet covering. 

(d) Where supplied-air respirators 
have a rigid or partly rigid head covering, 
a suitable harness shall be required 
to assist in holding this covering 
in place. 
� 84.152 Breathing tube test; minimum 
requirements. 

(a)(1) Type A and Type B supplied-air 
respirators shall employ one or two 
flexible breathing tubes of the 
nonkinking type which extend from 
the facepiece to a connecting hose coupling 
attached to the belt or harness. 

(2) The breathing tubes employed 
shall permit free head movement, insure 
against closing off by kinking or 
by chin or arm pressure, and they shall 
not create a pull that will loosen the 
facepiece or disturb the wearer. 
(b) Breathing tubes employed on 
Type C supplied-air respirators of the 
continuous flow class shall meet the 
minimum requirements set forth in 
paragraph (a) of this section, however, 
an extension of the connecting hose 
may be employed in lieu of the breathing 
tubes required. 
(c)(1) A flexible, nonkinking type 
breathing tube shall: 

(i) Be employed on Type C supplied-
air respirators of the demand and pressure-
demand class; and 
(ii) Extend from the facepiece to the 
demand or pressure-demand valve, except 
where the valve is attached directly 
to the facepiece. 
(2) The breathing tube shall permit 
free head movement, insure against 
closing off by kinking or by chin or 
arm pressure, and shall not create a 
pull that will loosen the facepiece or 
disturb the wearer. 
� 84.153 Airflow resistance test, Type A 

and Type AE supplied-air res


pirators; minimum requirements. 

(a) Airflow resistance will be determined 
when the respirator is completely 
assembled with the respiratory-
inlet covering, the air-supply device, 
and the maximum length of air-supply 
hose coiled for one-half its length in 
loops 1.5 to 2.1 m. (5 to 7 feet) in diameter. 
� 84.156 

(b) The inhalation resistance, drawn 
at the rate of 85 liters (3 cubic feet) per 
minute when the blower is not operating 
or under any practical condition 
of blower operation shall not exceed 
the following amounts: 
Maximum length of hose for 

Maximum resistance, water 

which respirator is approved 

column height 

Feet 

Meters 

Inches 

Millimeters 

75 

23 

1.5 

38 

150 

46 

2.5 

64 

250 

76 

3.5 

89 

300 

91 

4.0 

102 

(c) The exhalation resistance shall 
not exceed 25 mm. (1 inch) of water-column 
height at a flow rate of 85 liters (3 
cubic feet) per minute when the blower 
is not operating or under any practical 
condition of blower operation. 
� 84.154 Airflow resistance test; Type Band Type BE supplied-air respirators; 
minimum requirements. 

(a) Airflow resistance shall be determined 
when the respirator is completely 
assembled with the respiratory-
inlet covering and the hose in the maximum 
length to be considered for approval, 
coiled in loops 1.5 to 2.1 m. (5 to 
7 feet) in diameter. 
(b) Airflow resistance shall not exceed 
38 mm. (1.5 inches) of water-column 
height to air drawn at the flow 
rate of 85 liters (3 cubic feet) per 
minute. 
(c) The exhalation resistance shall 
not exceed 25 mm. (1 inch) of water-column 
height at this flow rate. 
� 84.155 Airflow resistance test; Type Csupplied-air respirator, continuous 
flow class and Type CE supplied-air 
respirator; minimum requirements. 

The resistance to air flowing from 
the respirator shall not exceed 25 mm. 
(1 inch) of water-column height when 
the air flow into the respiratory-inlet 
covering is 115 liters (4 cubic feet) per 
minute. 

� 84.156 Airflow resistance test; Type Csupplied-air respirator, demand 
class; minimum requirements. 

(a) Inhalation resistance shall not exceed 
50 millimeters (2 inches) of water 
at an air flow of 115 liters (4 cubic feet) 
per minute. 
579 




� 84.157 

(b) The exhalation resistance to a 
flow of air at a rate of 85 liters (3 cubic 
feet) per minute shall not exceed 25 
millimeters (1 inch) of water. 
� 84.157 Airflow resistance test; Type C 
supplied-air respirator, pressure-
demand class; minimum requirements. 


(a) The static pressure in the face-
piece shall not exceed 38 mm. (1.5 
inches) of water-column height. 
(b) The pressure in the facepiece 
shall not fall below atmospheric at inhalation 
airflows less than 115 liters (4 
cubic feet) per minute. 
(c) The exhalation resistance to a 
flow of air at a rate of 85 liters (3 cubic 
feet) per minute shall not exceed the 
static pressure in the facepiece by 
more than 51 mm. (2 inches) of water-
column height. 
� 84.158 Exhalation valve leakage test. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. water-column height while in a 
normal operating position. 
(b) Leakage between the valve and 
valve seat shall not exceed 30 milliliters 
per minute. 
� 84.159 Man tests for gases and vapors; 
supplied-air respirators; general 
performance requirements. 

(a) Wearers will enter a chamber containing 
a gas or vapor as prescribed in 
�� 84.160, 84.161, 84.162, and 84.163. 
(b) Each wearer will spend 10 minutes 
in work to provide observations on 
freedom of the device from leakage. 
The freedom and comfort allowed the 
wearer will also be considered. 
(c) Time during the test period will 
be divided as follows: 
(1) Five minutes. Walking, turning 
head, dipping chin; and 
(2) Five minutes. Pumping air with a 
tire pump into a 28-liter (1 cubic foot) 
container, or equivalent work. 
(d) No odor of the test gas or vapor 
shall be detected by the wearer in the 
air breathed during any such test, and 
the wearer shall not be subjected to 
any undue discomfort or encumbrance 
because of the fit, air delivery, or other 
features of the respirator during the 
testing period. 
42 CFR Ch. I (10�1�10 Edition) 

� 84.160 Man test for gases and vapors; 
Type A and Type AE respirators; 
test requirements. 

(a) The completely assembled respirator 
will be worn in a chamber containing 
0.1 �0.025 percent isoamyl acetate 
vapor, and the blower, the intake 
of the hose, and not more than 25 percent 
of the hose length will be located 
in isoamyl acetate-free air. 
(b) The man in the isoamyl acetate 
atmosphere will draw his inspired air 
through the hose, connections, and all 
parts of the air device by means of his 
lungs alone (blower not operating). 
(c) The 10-minute work test will be 
repeated with the blower in operation 
at any practical speed up to 50 revolutions 
of the crank per minute. 
� 84.161 Man test for gases and vapors; 
Type B and Type BE respirators; 
test requirements. 

(a) The completely assembled respirator 
will be worn in a chamber containing 
0.1 �0.025 percent isoamyl acetate 
vapor, and the intake of the hose, 
and not more than 25 percent of the 
hose length will be located in isoamyl 
acetate-free air. 
(b) The man in the isoamyl acetate 
atmosphere will draw his inspired air 
through the hose and connections by 
means of his lungs alone. 
� 84.162 Man test for gases and vapors; 
Type C respirators, continuous-flow 
class and Type CE supplied-air respirators; 
test requirements. 

(a) The completely assembled respirator 
will be worn in a chamber containing 
0.1 �0.025 percent isoamyl acetate 
vapor, the intake of the hose will 
be connected to a suitable source of 
respirable air, and not more than 25 
percent of the hose length will be located 
in isoamyl acetate-free air. 
(b) The minimum flow of air required 
to maintain a positive pressure in the 
respiratory-inlet covering throughout 
the entire breathing cycle will be supplied 
to the wearer, provided however, 
that airflow shall not be less than 115 
liters per minute for tight-fitting and 
not less than 170 liters per minute for 
loose-fitting respiratory inlet-coverings. 
580 




Public Health Service, HHS 

(c) The test will be repeated with the 
maximum rate of flow attainable within 
specified operating pressures. 
� 84.163 Man test for gases and vapors; 
Type C supplied-air respirators, demand 
and pressure-demand classes; 
test requirements. 

(a) The completely assembled respirator 
will be worn in a chamber containing 
0.1 �0.025 percent isoamyl ace-
Pt. 84, Subpt. J, Table 

tate vapor, the intake of the hose will 
be connected to a suitable source of 
respirable air, and not more than 25 
percent of the hose length will be located 
in isoamyl acetate-free air. 

(b) The test will be conducted at the 
minimum pressure with the maximum 
hose length and will be repeated at the 
maximum pressure with the minimum 
hose length. 
TABLE TO SUBPART J OF PART 84 

TABLE 8�AIR-SUPPLY-LINE REQUIREMENTS AND TESTS 

[42 CFR part 84, subpart J] 

Specific requirements 
Requirements for the air-supply lines of the indicated type of supplied-air respirators 
Type A Type B Type C 
Length of hose .............. Maximum of 91 m. (300 
feet), in multiples of 
7.6 m. (25 feet). 
Maximum of 23 m. (75 
feet) in multiples of 
7.6 m. (25 feet). 
Maximum of 91 m. (300 feet) in multiples of 7.6 
m. (25 feet). It will be permissible for the applicant 
to supply hose of the approved type of 
shorter length than 7.6 m. (25 feet) provided it 
meets the requirements of the part. 
Air flow ........................... None ............................. None ............................. The air-supply hose with air regulating valve or 
orifice shall permit a flow of not less than 115 
liters (4 cubic feet) per minute to tight-fitting 
and 170 liters (6 cubic feet) per minute to 
loose-fitting respiratory-inlet coverings through 
the maximum length of hose for which approval 
is granted and at the minimum specified 
air-supply pressure. The maximum flow 
shall not exceed 425 liters (15 cubic feet) per 
minute at the maximum specified air-supply 
pressure with the minimum length of hose for 
which approval is granted. 
Air flow ........................... ......do ............................ ......do ............................ The air-supply hose, detachable coupling, and 
demand valve of the demand class or pressure-
demand valve of the pressure-demand 
class for Type C supplied-air respirators, demand 
and pressure-demand classes, shall be 
capable of delivering respirable air at a rate of 
not less than 115 liters (4 cubic feet) per 
minute to the respiratory-inlet covering at an 
inhalation resistance not exceeding 50 millimeters 
(2 inches) of water-column height 
measured in the respiratory-inlet covering with 
any combination of air-supply pressure and 
length of hose within the applicant�s specified 
range of pressure and hose length. The air-
flow rate and resistance to inhalation shall be 
measured while the demand or pressure-demand 
valve is actuated 20 times per minute 
by a source of intermittent suction. The maximum 
rate of flow to the respiratory-inlet covering 
shall not exceed 425 liters (15 cubic 
feet) per minute under the specified operating 
conditions. 

581 




Pt. 84, Subpt. J, Table 42 CFR Ch. I (10�1�10 Edition) 

TABLE 8�AIR-SUPPLY-LINE REQUIREMENTS AND TESTS�Continued 
[42 CFR part 84, subpart J] 

Specific requirements 
Requirements for the air-supply lines of the indicated type of supplied-air respirators 
Type A Type B Type C 
Air-regulating valve ........ 
Noncollapsibility ............. 
Nonkinkability ................ 
Strength of hose and 
couplings. 
......do ............................ 
The hose shall not collapse 
or exhibit permanent 
deformation 
when a force of 90 
kg. (200 pounds) is 
applied for 5 minutes 
between 2 planes 7.6 
cm. (3 inches) wide 
on opposite sides of 
the hose. 
None ............................. 
Hose and couplings 
shall not separate or 
fail when tested with 
a pull of 113 kg. (250 
pounds) for 5 minutes. 
......do ............................ 
Same as Type A .......... 
None ............................. 
Same as Type A .......... 
If an air-regulating valve is provided, it shall be 
so designed that it will remain at a specific 
adjustment, which will not be affected by the 
ordinary movement of the wearer. The valve 
must be so constructed that the air supply 
with the maximum length of hose and at the 
minimum specified air-supply pressure will not 
be less than 115 liters (4 cubic feet) of air per 
minute to tight-fitting and 170 liters (6 cubic 
feet) of air per minute of loose-fitting respiratory 
inlet coverings for any adjustment of 
the valve. If a demand or pressure-demand 
valve replaces the air-regulating valve, it shall 
be connected to the air-supply at the maximum 
air pressure for which approval is 
sought by means of the minimum length of 
air-supply hose for which approval is sought. 
The outlet of the demand or pressure-demand 
valve shall be connected to a source of intermittent 
suction so that the demand or pressure-
demand valve is actuated approximately 
20 times per minute for a total of 100,000 
inhalations. To expedite this test, the rate of 
actuation may be increased if mutually agreeable 
to the applicant and NIOSH. During this 
test the valve shall function without failure 
and without excessive wear of the moving 
parts. The demand or pressure-demand valve 
shall not be damaged in any way when subjected 
at the outlet to a pressure or suction of 
25 cm. (10 inches) of water gage for 2 minutes. 
None. 
A 7.6 m. (25 foot) section of the hose will be 
placed on a horizontal-plane surface and 
shaped into a one-loop coil with one end of 
the hose connected to an airflow meter and 
the other end of the hose supplied with air at 
the minimum specified supply pressure. The 
connection shall be in the plane of the loop. 
The other end of the hose will be pulled tangentially 
to the loop and in the plane of the 
loop until the hose straightens. To meet the 
requirements of this test the loop shall maintain 
a uniform near-circular shape and ultimately 
unfold as a spiral, without any localized 
deformation that decreases the flow of 
air to less than 90 percent of the flow when 
the hose is tested while remaining in a 
straight line. 
Hose and couplings shall not exhibit any separation 
or failure when tested with a pull of 45 
kg. (100 pounds) for 5 minutes and when 
tested by subjecting them to an internal air 
pressure of 2 times the maximum respirator-
supply pressure that is specified by the applicant 
or at 173 kN/m. 2 (25 pounds per square 
inch) gage, whichever is higher. 

582 




Public Health Service, HHS � 84.171 

TABLE 8�AIR-SUPPLY-LINE REQUIREMENTS AND TESTS�Continued 
[42 CFR part 84, subpart J] 

Specific requirements 
Requirements for the air-supply lines of the indicated type of supplied-air respirators 
Type A Type B Type C 
Tightness ....................... 
Permeation of hose by 
gasoline. 
Detachable coupling ...... 
No air leakage shall 
occur when the hose 
and couplings are 
joined and the joint(s) 
are immersed in 
water and subjected 
to an internal air 
pressure of 35 kN/m. 
2 (5 pounds per 
square inch) gage. 
The permeation of the 
hose by gasoline will 
be tested by immersing 
7.6 m. (25 feet) of 
hose and one coupling 
in gasoline, with 
air flowing through 
the hose at the rate 
of 8 liters per minute 
for 6 hours. The air 
from the hose shall 
not contain more than 
0.01 percent by volume 
of gasoline 
vapor at the end of 
the test. 
None ............................. 
None ............................. 
Same as for Type A ..... 
None ............................. 
Leakage of air exceeding 50 cc. per minute at 
each coupling shall not be permitted when the 
hose and couplings are joined and are immersed 
in water, with air flowing through the 
respirator under a pressure of 173 kN/m. 2 
(25 pounds per square inch) gage applied to 
the inlet end of the air-supply hose, or at 
twice the maximum respirator-supply pressure 
that is specified by the applicant, whichever is 
higher. 
Same as for Type A, except the test period 
shall be 1 hour. 
A hand-operated detachable coupling by which 
the wearer can readily attach or detach the 
connecting hose shall be provided at a convenient 
location. This coupling shall be durable, 
remain connected under all conditions of 
normal respirator use, and meet the prescribed 
tests for strength and tightness of 
hose and couplings. 

Subpart K�Non-Powered Air-
Purifying Particulate Respirators 


� 84.170 Non-powered air-purifying 
particulate respirators; description. 

(a) Non-powered air-purifying particulate 
respirators utilize the wearer�s 
negative inhalation pressure to draw 
the ambient air through the air-purifying 
filter elements (filters) to remove 
particulates from the ambient air. 
They are designed for use as respiratory 
protection against 
atmospheres with particulate contaminants 
(e.g., dusts, fumes, mists) that 
are not immediately dangerous to life 
or health and that contain adequate 
oxygen to support life. 
(b) Non-powered air-purifying particulate 
respirators are classified into 
three series, N-, R-, and P-series. The 
N-series filters are restricted to use in 
those workplaces free of oil aerosols. 
The R- and P-series filters are intended 
for removal of any particulate that includes 
oil-based liquid particulates. 

(c) Non-powered air-purifying particulate 
respirators are classified according 
to the efficiency level of the filter(
s) as tested according to the requirements 
of this part. 
(1) N100, R100, and P100 filters shall 
demonstrate a minimum efficiency 
level of 99.97 percent. 
(2) N99, R99, and P99 filters shall 
demonstrate a minimum efficiency 
level of 99 percent. 
(3) N95, R95, and P95 filters shall 
demonstrate a minimum efficiency 
level of 95 percent. 
� 84.171 Non-powered air-purifying 
particulate respirators; required 
components. 

(a) Each non-powered air-purifying 
particulate respirator described in 
� 84.170 shall, where its design requires, 
contain the following component parts: 
583 




� 84.172 

(1) Facepiece, mouthpiece with nose-
clip, hood, or helmet; 
(2) Filter unit; 
(3) Harness; 
(4) Attached blower; and 
(5) Breathing tube. 
(b) The components of each non-powered 
air-purifying particulate respirator 
shall meet the minimum construction 
requirements set forth in 
subpart G of this part. 
� 84.172 Breathing tubes; minimum requirements. 


Flexible breathing tubes used in conjunction 
with respirators shall be designed 
and constructed to prevent: 

(a) Restriction of free head movement; 
(b) Disturbance of the fit of 
facepieces, mouthpieces, hoods, or helmets; 
(c) Interference with the wearer�s activities; 
and 
(d) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.173 Harnesses; installation and 
construction; minimum requirements. 


(a) Each respirator shall, where necessary, 
be equipped with a suitable harness 
designed and constructed to hold 
the components of the respirator in position 
against the wearer�s body. 
(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of respirator parts, 
and, where applicable, provide for holding 
a full facepiece in the ready position 
when not in use. 
� 84.174 Respirator containers; minimum 
requirements. 

(a) Except as provided in paragraph 
(b) of this section each respirator shall 
be equipped with a substantial, durable 
container bearing markings which 
show the applicant�s name, the type of 
respirator it contains, and all appropriate 
approval labels. 
(b) Containers for single-use respirators 
may provide for storage of 
more than one respirator, however, 
such containers shall be designed and 
constructed to prevent contamination 
of respirators which are not removed, 
and to prevent damage to respirators 
during transit. 
42 CFR Ch. I (10�1�10 Edition) 

� 84.175 Half-mask facepieces, full 
facepieces, hoods, helmets, and 
mouthpieces; fit; minimum requirements. 


(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Full facepieces shall provide for 
optional use of corrective spectacles or 
lenses, which shall not reduce the respiratory 
protective qualities of the respirator. 
(c) Hoods and helmets shall be designed 
and constructed to fit persons 
with various head sizes, provide for the 
optional use of corrective spectacles or 
lenses, and insure against any restriction 
of movement by the wearer. 
(d) Mouthpieces shall be equipped 
with noseclips which are securely attached 
to the mouthpiece or respirator 
and provide an airtight seal. 
(e) Facepieces, hoods, and helmets 
shall be designed to prevent eyepiece 
fogging. 
(f) Half-mask facepieces shall not 
interfere with the fit of common industrial 
safety corrective spectacles. 
� 84.176 Facepieces, hoods, and helmets; 
eyepieces; minimum requirements. 


Facepieces, hoods, and helmets shall 
be designed and constructed to provide 
adequate vision which is not distorted 
by the eyepieces. 

� 84.177 Inhalation and exhalation 
valves; minimum requirements. 

(a) Inhalation and exhalation valves 
shall be protected against distortion. 
(b) Inhalation valves shall be designed 
and constructed and provided 
where necessary to prevent excessive 
exhaled air from adversely affecting 
filters, except where filters are specifically 
designed to resist moisture. 
(c) Exhalation valves shall be: 
(1) Provided where necessary; 
(2) Protected against damage and external 
influence; and 
584 




Public Health Service, HHS 

(3) Designed and constructed to prevent 
inward leakage of contaminated 
air. 
� 84.178 Head harnesses; minimum requirements. 


(a) All facepieces shall be equipped 
with head harnesses designed and constructed 
to provide adequate tension 
during use and an even distribution of 
pressure over the entire area in contact 
with the face. 
(b) Facepiece head harnesses, except 
those employed on single-use respirators, 
shall be adjustable and replaceable. 
(c) Mouthpieces shall be equipped, 
where applicable, with adjustable and 
replaceable harnesses, designed and 
constructed to hold the mouthpiece in 
place. 
� 84.179 Non-powered air-purifying 
particulate respirators; filter identification. 


(a) The respirator manufacturer, as 
part of the application for certification, 
shall specify the filter series 
and the filter efficiency level (i.e., 
��N95��, ��R95, ��P95��, ��N99, ��R99��, 
��P99��, ��N100��, ��R100��, or ��P100��) for 
which certification is being sought. 
(b) Filters shall be prominently labeled 
as follows: 
(1) N100 filters shall be labeled ��N100 
Particulate Filter (99.97% filter efficiency 
level)�� and shall be a color 
other than magenta. 
(2) R100 filters shall be labeled ��R100 
Particulate Filter (99.97% filter efficiency 
level)�� and shall be a color 
other than magenta. 
(3) P100 filters shall be labeled ��P100 
Particulate Filter (99.97% filter efficiency 
level)�� and shall be color coded 
magenta. 
(4) N99 filters shall be labeled ��N99 
Particulate Filter (99% filter efficiency 
level)�� and shall be a color other than 
magenta. 
(5) R99 filters shall be labeled ��R99 
Particulate Filter (99% filter efficiency 
level)�� and shall be a color other than 
magenta. 
(6) P99 filters shall be labeled ��P99 
Particulate Filter (99% filter efficiency 
level)�� and shall be a color other than 
magenta. 
� 84.181 

(7) N95 filters shall be labeled as ��N95 
Particulate Filter (95% filter efficiency 
level)�� and shall be a color other than 
magenta. 
(8) R95 filters shall be labeled as ��R95 
Particulate Filter (95% filter efficiency 
level)�� and shall be a color other than 
magenta. 
(9) P95 filters shall be labeled as ��P95 
Particulate Filter (95% filter efficiency 
level)�� and shall be a color other than 
magenta. 
� 84.180 Airflow resistance tests. 

(a) Resistance to airflow will be 
measured in the facepiece, mouthpiece, 
hood, or helmet of a particulate respirator 
(complete respirator) mounted 
on a test fixture with air flowing at 
continuous rate of 85 �2 liters per 
minute, before each test conducted in 
accordance with � 84.182. 
(b) The resistances for particulate 
respirators upon initial inhalation 
shall not exceed 35 mm water column 
height pressure and upon initial exhalation 
shall not exceed 25 mm water 
column height pressure. 
� 84.181 Non-powered air-purifyingparticulate filter efficiency level determination. 


(a) Twenty filters of each non-powered 
air-purifying particulate respirator 
model shall be tested for filter 
efficiency against: 
(1) A solid sodium chloride particulate 
aerosol as per this section, if N-series 
certification is requested by the 
applicant. 
(2) A dioctyl phthalate or equivalent 
liquid particulate aerosol as per this 
section, if R-series or P-series certification 
is requested by the applicant. 
(b) Filters including holders and gaskets; 
when separable, shall be tested 
for filter efficiency level, as mounted 
on a test fixture in the manner as used 
on the respirator. 
(c) Prior to filter efficiency testing of 
20 N-series filters, the 20 to be tested 
shall be taken out of their packaging 
and placed in an environment of 85 �5 
percent relative humidity at 38 �2.5 �C 
for 25 �1 hours. Following the pre-conditioning, 
filters shall be sealed in a 
gas-tight container and tested within 
10 hours. 
585 




� 84.182 

(d) When the filters do not have separable 
holders and gaskets, the exhalation 
valves shall be blocked so as to ensure 
that leakage, if present, is not included 
in the filter efficiency level 
evaluation. 
(e) For non-powered air-purifying 
particulate respirators with a single 
filter, filters shall be tested at a continuous 
airflow rate of 85 �4 liters per 
minute. Where filters are to be used in 
pairs, the test-aerosol airflow rate 
shall be 42.5 �2 liters per minute 
through each filter. 
(f) Filter efficiency test aerosols. (1) 
When testing N-series filters, a sodium 
chloride or equivalent solid aerosol at 
25 �5 �C and relative humidity of 30 �10 
percent that has been neutralized to 
the Boltzmann equilibrium state shall 
be used. Each filter shall be challenged 
with a concentration not exceeding 200 
mg/m3. 
(2) When testing R-series and P-series 
filters, a neat cold-nebulized dioctyl 
phthalate (DOP) or equivalent aerosol 
at 25 �5 �C that has been neutralized to 
the Boltzmann equilibrium state shall 
be used. Each filter shall be challenged 
with a concentration not exceeding 200 
mg/m3. 
(3) The test shall continue until minimum 
efficiency is achieved or until an 
aerosol mass of at least 200 �5 mg has 
contacted the filter. For P-series filters, 
if the filter efficiency is decreasing 
when the 200 �5 mg challenge point 
is reached, the test shall be continued 
until there is no further decrease in efficiency. 
(g) The sodium chloride test aerosol 
shall have a particle size distribution 
with count median diameter of 0.075 
�0.020 micrometer and a standard geometric 
deviation not exceeding 1.86 at 
the specified test conditions as determined 
with a scanning mobility particle 
sizer or equivalent. The DOP aerosol 
shall have a particle size distribution 
with count median diameter of 
0.185 �0.020 micrometer and a standard 
geometric deviation not exceeding 1.60 
at the specified test conditions as determined 
with a scanning mobility particle 
sizer or equivalent. 
(h) The efficiency of the filter shall 
be monitored and recorded throughout 
the test period by a suitable forward-
42 CFR Ch. I (10�1�10 Edition) 

light-scattering photometer or equivalent 
instrumentation. 

(i) The minimum efficiency for each 
of the 20 filters shall be determined and 
recorded and be equal to or greater 
than the filter efficiency criterion listed 
for each level as follows: 
P100, R100 and N100: Efficiency =99.97% 
P99, R99 and N99: Efficiency =99% 
P95, R95 and N95: Efficiency =95% 


� 84.182 Exhalation valve leakage test; 
minimum requirements. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. water-column height while in a 
normal operating position. 
(b) Leakage between the valve and 
valve seat shall not exceed 30 milliliters 
per minute. 
Subpart L�Chemical CartridgeRespirators 

� 84.190 Chemical cartridge respirators: 
description. 

(a) Chemical cartridge respirators including 
all completely assembled respirators 
which are designed for use as 
respiratory protection during entry 
into or escape from atmospheres not 
immediately dangerous to life and 
health, are described according to the 
specific gases or vapors against which 
they are designed to provide respiratory 
protection, as follows: 
Maximum 
use con-
Type of chemical cartridge respirator 1 

centration, 
parts per 
million 

Ammonia ............................................................ 


300 
Chlorine ............................................................. 

10 
Hydrogen chloride ............................................. 

50 
Methyl amine ..................................................... 

100 
Organic vapor .................................................... 

2 1,000 
Sulfur dioxide ..................................................... 

50 
Vinyl chloride ..................................................... 

10 

1 Not for use against gases or vapors with poor warning 
properties (except where MSHA or Occupational Safety and 
Health Administration standards may permit such use for a 
specific gas or vapor) or those which generate high heats of 
reaction with sorbent material in the cartridge. 

2 Maximum use concentrations are lower for organic vapors 
which produce atmospheres immediately hazardous to life or 
health at concentrations equal to or lower than this 
concentration. 

(b) Chemical cartridge respirators for 
respiratory protection against gases or 
vapors, which are not specifically listed 
with their maximum use concentration, 
may be approved if the applicant 
586 




Public Health Service, HHS 

submits a request for such approval, in 
writing, to the Institute. The Institute 
shall consider each such application 
and accept or reject the application 
after a review of the effects on the 
wearer�s health and safety and in the 
light of any field experience in use of 
chemical cartridge respirators as protection 
against such hazards. 

� 84.191 Chemical cartridge respirators; 
required components. 

(a) Each chemical cartridge respirator 
described in � 84.190 shall, where 
its design requires, contain the following 
component parts: 
(1) Facepiece, mouthpiece, and nose-
clip, hood, or helmet; 
(2) Cartridge; 
(3) Cartridge with filter; 
(4) Harness; 
(5) Breathing tube; and 
(6) Attached blower. 
(b) The components of each chemical 
cartridge respirator shall meet the 
minimum construction requirements 
set forth in subpart G of this part. 
� 84.192 Cartridges in parallel; resistance 
requirements. 

Where two or more cartridges are 
used in parallel, their resistance to airflow 
shall be essentially equal. 

� 84.193 Cartridges; color and markings; 
requirements. 

The color and markings of all cartridges 
or labels shall conform with the 
requirements of the American National 
Standards Institute, American National 
Standard for Identification of 
Air-Purifying Respirator Canisters and 
Cartridges, ANSI K13.1�1973. ANSI 
K13.1 is incorporated by reference and 
has been approved by the Director of 
the Federal Register in accordance 
with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from American 
National Standards Institute, Inc., 1430 
Broadway, New York, NY 10018. Copies 
may be inspected at the NIOSH, Certification 
and Quality Assurance 
Branch, 1095 Willowdale Road, Morgan-
town, WV 26505�2888, or at the National 
Archives and Records Administration 
(NARA). For information on the availability 
of this material at NARA, call 
202�741�6030, or go to: http:// 
www.archives.gov/federallregister/ 

� 84.197 

codeloflfederallregulations/ 
ibrllocations.html. 

� 84.194 Filters used with chemical 
cartridges; location; replacement. 

(a) Particulate matter filters used in 
conjunction with a chemical cartridge 
shall be located on the inlet side of the 
cartridge. 
(b) Filters shall be incorporated in or 
firmly attached to the cartridge and 
each filter assembly shall, where applicable, 
be designed to permit its easy removal 
from and replacement on the 
cartridge. 
� 84.195 Breathing tubes; minimum requirements. 


Flexible breathing tubes used in conjunction 
with respirators shall be designed 
and constructed to prevent: 

(a) Restriction of free head movement; 
(b) Disturbance of the fit of 
facepieces, mouthpieces, hoods, or helmets; 
(c) Interference with the wearer�s activities; 
and 
(d) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.196 Harnesses; installation and 

construction; minimum require


ments. 

(a) Each respirator shall, where necessary, 
be equipped with a suitable harness 
designed and constructed to hold 
the components of the respirator in position 
against the wearer�s body. 
(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of respirator parts 
and, where applicable, provide for holding 
a full facepiece in the ready position 
when not in use. 
� 84.197 Respirator containers; minimum 
requirements. 

Respirators shall be equipped with a 
substantial, durable container bearing 
markings which show the applicant�s 
name, the type and commercial designation 
of the respirator it contains 
and all appropriate approval labels. 

587 




� 84.198 

� 84.198 Half-mask facepieces, full 
facepieces, mouthpieces, hoods, and 
helmets; fit; minimum requirements. 


(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Hoods and helmets shall be designed 
and constructed to fit persons 
with various head sizes, provide for the 
optional use of corrective spectacles or 
lenses, and insure against any restriction 
of movement by the wearer. 
(c) Mouthpieces shall be equipped 
with noseclips which are securely attached 
to the mouthpiece or respirator 
and provide an airtight fit. 
(d) Full facepieces shall provide for 
optional use of corrective spectacles or 
lenses which shall not reduce the respiratory 
protective qualities of the respirator. 
(e) Facepieces, hoods, and helmets 
shall be designed to prevent eyepiece 
fogging. 
� 84.199 Facepieces, hoods, and helmets; 
eyepieces; minimum requirements. 


Facepieces, hoods, and helmets shall 
be designed and constructed to provide 
adequate vision which is not distorted 
by the eyepieces. 

� 84.200 Inhalation and exhalation 
valves; minimum requirements. 

(a) Inhalation and exhalation valves 
shall be provided where necessary and 
protected against distortion. 
(b) Inhalation valves shall be designed 
and constructed to prevent excessive 
exhaled air from entering cartridges 
or adversely affecting canisters. 
(c) Exhalation valves shall be� 
42 CFR Ch. I (10�1�10 Edition) 

(1) Protected against damage and external 
influence; and 
(2) Designed and constructed to prevent 
inward leakage of contaminated 
air. 
� 84.201 Head harnesses; minimum requirements. 


(a)(1) Facepieces for chemical cartridge 
respirators other than single-use 
vinyl chloride shall be equipped with 
adjustable and replaceable head harnesses 
designed and constructed to provide 
adequate tension during use and 
an even distribution of pressure over 
the entire area in contact with the 
face. 

(2) Facepieces for single-use vinyl 
chloride respirators shall be equipped 
with adjustable head harnesses designed 
and constructed to provide adequate 
tension during use and an even 
distribution of pressure over the entire 
area in contact with the face. 
(b) Mouthpieces shall be equipped 
where applicable, with an adjustable 
and replaceable harness designed and 
constructed to hold the mouthpiece in 
place. 
� 84.202 Air velocity and noise levels;

hoods and helmets; minimum re


quirements. 

Noise levels generated by the respirator 
will be measured inside the 
hood or helmet at maximum airflow 
obtainable and shall not exceed 80 dBA. 

� 84.203 Breathing resistance test; minimum 
requirements. 

(a) Resistance to airflow will be 
measured in the facepiece, mouthpiece, 
hood, or helmet of a chemical cartridge 
respirator mounted on a test fixture 
with air flowing at a continuous rate of 
85 liters per minute, both before and 
after each test conducted in accordance 
with �� 84.206 through 84.207. 
(b) The maximum allowable resistance 
requirements for chemical cartridge 
respirators are as follows: 
MAXIMUM RESISTANCE 

[Millimeter water column height] 

Type of chemical-cartridge respirator 
Inhalation 
Exhalation 
Initial Final 1 
Other than single-use vinyl chloride respirators: 
For gases, vapors, or gases and vapors ........................................................ 40 45 20 

588 




Public Health Service, HHS � 84.207 

MAXIMUM RESISTANCE�Continued 
[Millimeter water column height] 

Type of chemical-cartridge respirator 
Inhalation 
Exhalation 
Initial Final 1 
For gases, vapors, or gases and vapors, and particulates ............................ 
Single-use respirator with valves: 
For vinyl chloride ............................................................................................. 
For vinyl chloride and particulates .................................................................. 
Single-use respirator without valves: 
For vinyl chloride ............................................................................................. 
For vinyl chloride and particulates .................................................................. 
50 
20 
30 
15 
25 
70 
25 
45 
20 
40 
20 
20 
2 
(2) 
(2) 

1 Measured at end of service life specified in Table 11 of this subpart. 
2 Same as inhalation. 

� 84.204 Exhalation valve leakage test;
minimum requirements. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. water-column height while in a 
normal operating position. 
(b) Leakage between the valve and 
valve seat shall not exceed 30 milliliters 
per minute. 
� 84.205 Facepiece test; minimum requirements. 


(a) The complete chemical cartridge 
respirator will be fitted to the faces of 
persons having varying facial shapes 
and sizes. 
(b) Where the applicant specifies a 
facepiece size or sizes for the respirator 
together with the approximate measurement 
of faces they are designed to 
fit, the Institute will provide test subjects 
to suit such facial measurements. 
(c) Any chemical cartridge respirator 
part which must be removed to perform 
the facepiece or mouthpiece fit test 
shall be replaceable without special 
tools and without disturbing facepiece 
or mouthpiece fit. 
(d) The facepiece or mouthpiece fit 
test using the positive or negative 
pressure recommended by the applicant 
and described in his instructions will 
be used before each test. 
(e)(1) Each wearer will enter a chamber 
containing 100 p.p.m. isoamyl acetate 
vapor for half-mask facepieces, 
and 1,000 p.p.m. for full facepieces, 
mouthpieces, hoods, and helmets. 

(2) The facepiece or mouthpiece may 
be adjusted, if necessary, in the test 
chamber before starting the test. 
(3) Each wearer will remain in the 
chamber for 8 minutes while performing 
the following activities: 
(i) Two minutes, nodding and turning 
head; 
(ii) Two minutes, calisthenic arm 
movements; 
(iii) Two minutes, running in place; 
and 
(iv) Two minutes, pumping with a 
tire pump into a 28-liter (1 cubic-foot) 
container. 
(4) Each wearer shall not detect the 
odor of isoamyl-acetate vapor during 
the test. 
� 84.206 Particulate tests; respirators 
with filters; minimum requirements; 
general. 

(a) Three respirators with cartridges 
containing, or having attached to 
them, filters for protection against 
particulates will be tested in accordance 
with the provisions of � 84.207. 
(b) In addition to the test requirements 
set forth in paragraph (a) of this 
section, three such respirators will be 
tested, as appropriate, in accordance 
with the provisions of �� 84.179 through 
84.183; however, the maximum allowable 
resistance of complete particulate, 
and gas, vapor, or gas and vapor chemical 
cartridge respirators shall not exceed 
the maximum allowable limits set 
forth in � 84.203. 
� 84.207 Bench tests; gas and vapor 
tests; minimum requirements; general. 


(a) Bench tests will be made on an 
apparatus that allows the test atmosphere 
at 50 �5 percent relative humidity 
and room temperature, approximately 
25 �C, to enter the cartridges 
continuously at predetermined concentrations 
and rates of flow, and that 
589 




Pt. 84, Subpt. L, Tables 

has means for determining the test life 
of the cartridges. 

(b) Where two cartridges are used in 
parallel on a chemical cartridge respirator, 
the bench test will be performed 
with the cartridges arranged in 
parallel, and the test requirements will 
apply to the combination rather than 
to the individual cartridges. 
(c) Three cartridges or pairs of cartridges 
will be removed from containers 
and tested as received from the 
applicant. 
(d) Two air purifying cartridges or 
pairs of cartridges will be equilibrated 
at room temperature by passing 25 per42 
CFR Ch. I (10�1�10 Edition) 

cent relative humidity air through 
them at the flow rate of 25 liters per 
minute (l.p.m.) for 6 hours. 

(e) Two air purifying cartridges or 
pairs of cartridges will be equilibrated 
by passing 85 percent relative humidity 
air through them at the flow rate of 25 
l.p.m. 
(f) All cartridges will be resealed, 
kept in an upright position, at room 
temperatures, and tested within 18 
hours. 
(g) Cartridges will be tested and shall 
meet the minimum requirements set 
forth in Table 11 of this subpart. 
TABLES TO SUBPART L OF PART 84 

TABLES 9�10 [RESERVED] 
TABLE 11�CARTRIDGE BENCH TESTS AND REQUIREMENTS 
[42 CFR part 84, subpart L] 


Cartridge Test condition 
Test atmosphere 
Flowrate 
(l.p.m.) 
Number of 
tests 
Penetration 
1 
(p.p.m.) 
Minimum 
life 2 (min.)Gas or vapor Concentration 
(p.p.m.) 
Ammonia ........... As received ....... NH3 1000 64 3 50 50 
Ammonia ........... Equilibrated ....... NH3 1000 32 4 50 50 
Chlorine ............. As received ....... Cl2 500 64 3 5 35 
Chlorine ............. Equilibrated ....... Cl2 500 32 4 5 35 
Hydrogen chlo-As received ....... HCl 500 64 3 5 50 
ride. 
Hydrogen chlo-Equilibrated ....... HCl 500 32 4 5 50 
ride. 
Methylamine ...... As received ....... CH3 NH2 1000 64 3 10 25 
Methylamine ...... Equilibrated ....... CH3 NH2 1000 32 4 10 25 
Organic vapors .. As received ....... CCl4 1000 64 3 5 50 
Organic vapors .. Equilibrated ....... CCl4 1000 32 4 5 50 
Sulfur dioxide ..... As received ....... SO2 500 64 3 5 30 
Sulfur dioxide ..... Equilibrated ....... SO2 500 32 4 5 30 

1 Minimum life will be determined at the indicated penetration. 

2 Where a respirator is designed for respiratory protection against more than one type of gas or vapor, as for use in ammonia 
and in chlorine, the minimum life shall be one-half that shown for each type of gas or vapor. Where a respirator is designed for 
respiratory protection against more than one gas of a type, as for use in chlorine and sulfur dioxide, the stated minimal life shall 

apply. 

Subpart M [Reserved] 


Subpart N�Special Use 
Respirators 


� 84.250 Vinyl chloride respirators; description. 


Vinyl chloride respirators, including 
all completely assembled respirators 
which are designed for use as respiratory 
protection during entry into 
and escape from vinyl chloride 
atmospheres containing adequate oxygen 
to support life, are described ac


cording to their construction as follows: 


(a) Front-mounted or back-mounted 
gas masks; 
(b) Chin-style gas masks; 
(c) Chemical-cartridge respirators; 
(d) Powered air-purifying respirators; 
and 
(e) Other devices, including combination 
respirators. 
590 




Public Health Service, HHS 

� 84.251 Required components. 

(a) Each vinyl chloride respirator described 
in � 84.250 shall, where its design 
requires, contain the following 
component parts: 
(1) Facepiece; 
(2) Canister with end-of-service-life 
indicator; 
(3) Cartridge with end-of-service-life 
indicator; 
(4) Harness; 
(5) Attached blower; and 
(6) Breathing tube. 
(b) The components of each vinyl 
chloride respirator shall meet the minimum 
construction requirements set 
forth in Subpart G of this part. 
� 84.252 Gas masks; requirements and 
tests. 

(a) Except for the tests prescribed in 
� 84.126, the minimum requirements and 
performance tests for gas masks, prescribed 
in Subpart I of this part, are 
applicable to vinyl chloride gas masks. 
(b) The following bench tests are applicable 
to canisters designed for use 
with gas masks for entry into and escape 
from vinyl chloride atmospheres 
containing adequate oxygen to support 
life: 
(1) Four canisters will be equilibrated 
at 25 �5 �C by passing 85 �5 percent relative 
humidity air through them at 64 
liters per minute for six hours. 
(2) The equilibrated canisters will be 
resealed, kept in an upright position at 
room temperature, and tested according 
to paragraph (b)(3) of this section 
within 18 hours. 
(3) The canisters equilibrated and 
stored as described in paragraphs (b) (1) 
and (2) of this section will be tested on 
an apparatus that allows the test atmosphere 
at 85 �5 percent relative humidity 
and 25 �5 �C to enter the canister 
continuously at a concentration 
of 25 ppm vinyl chloride monomer at a 
total flow rate of 64 liters per minute. 
(4) The maximum allowable penetration 
after six hours of testing according 
to paragraph (b)(3) of this section 
shall not exceed 1 ppm vinyl chloride. 
(c) Where canisters are submitted for 
testing and approval with a service life 
of more than four hours, the period of 
time for testing for vinyl chloride penetration 
will be performed at 150% of 
the service life specified in the manu� 
84.253 

facturer�s application. (Example: If a 
manufacturer requests approval of a 
respirator for six hours use against exposure 
to vinyl chloride, the maximum 
allowable penetration after nine hours 
of testing shall not exceed 1 ppm vinyl 
chloride.) 

� 84.253 Chemical-cartridge respirators; 
requirements and tests. 

(a) Except for the tests prescribed in 
�� 84.206 and 84.207, the minimum requirements 
and performance tests for 
chemical-cartridge respirators prescribed 
in Subpart L of this part are 
applicable to replaceable-cartridge and 
single-use vinyl chloride chemical-cartridge 
respirators. 
(b) The following bench tests are applicable 
to cartridges designed for use 
with chemical-cartridge respirators for 
entry into and escape from vinyl chloride 
atmospheres containing adequate 
oxygen to support life: 
(1) Where two cartridges are used in 
parallel on a chemical-cartridge respirator, 
the bench test requirements 
will apply to the combination rather 
than the individual cartridges. 
(2) Four cartridges or pairs of cartridges 
will be equilibrated at 25 �5 �C 
by passing 85 �5 percent relative humidity 
air through them at 25 liters 
per minute for six hours. 
(3) The equilibrated cartridges will be 
resealed, kept in an upright position, 
at room temperature, and tested according 
to paragraphs (b)(4) and (b)(5) 
of this section for other than single-use 
respirators or according to paragraphs 
(b)(6) and (b)(7) of this section for sin-
gle-use respirators within 18 hours. 
(4) The cartridges or pairs of cartridges 
for other than single-use respirators, 
equilibrated and stored as described 
in paragraphs (b)(1), (b)(2), and 
(b)(3) of this section, will be tested on 
an apparatus that allows the test atmosphere 
at 85 �5 percent relative humidity 
and 25 �5 �C, to enter the cartridges 
or pairs of cartridges continuously 
at a concentration of 10 ppm 
vinyl chloride monomer at a total 
flowrate of 64 liters per minute. 
(5) The maximum allowable penetration 
after 90 minutes testing of cartridges 
or pairs of cartridges for other 
than single-use respirators, according 
591 




� 84.254 

to paragraph (b)(4) of this section shall 
not exceed 1 ppm vinyl chloride. 

(6) The single-use respirators, equilibrated 
and stored as described in paragraphs 
(b)(2) and (b)(3) of this section, 
will be tested on an apparatus that allows 
a test atmosphere at 85 �5 percent 
relative humidity and 25 �5 �C to be cycled 
through the respirator by a 
breathing machine at a concentration 
of 10 ppm vinyl chloride monomer at 
the rate of 24 respirations per minute 
at a minute volume of 40 �0.6 liters. Air 
exhaled through the respirator will be 
35 �2 �C with 94 �3 percent relative humidity. 
(7) The maximum allowable penetration 
after 144 minutes testing of respirators, 
according to paragraph (b)(6) 
of this section, shall not exceed 1 ppm 
vinyl chloride. 
� 84.254 Powered air-purifying respirators; 
requirements and tests. 

(a) Except for the tests prescribed in 
� 84.207, the minimum requirements and 
performance tests for powered air-purifying 
respirators prescribed in subpart 
L of this part are applicable to vinyl 
chloride powered air-purifying respirators. 
(b) The following bench tests are applicable 
to cartridges designed for use 
with powered air-purifying respirators 
for entry into and escape from vinyl 
chloride atmospheres containing adequate 
oxygen to support life: 
(1) Four cartridges will be equilibrated 
at 25 � �C by passing 85 �5 percent 
relative humidity air through 
them at 115 liters per minute for tight-
fitting facepieces and 170 liters per 
minute for loose-fitting hoods and helmets, 
for six hours. 
(2) The equilibrated cartridges will be 
resealed, kept in an upright position at 
room temperature and tested according 
to paragraph (b)(3) of this section within 
18 hours. 
(3) The cartridges equilibrated and 
stored as described in paragraphs (b) (1) 
and (2) of this section will be tested on 
an apparatus that allows the test atmosphere 
at 85 �5 percent relative humidity 
and 25 �5 �C to enter the cartridge 
continuously at a concentration 
of 25 ppm vinyl chloride monomer at a 
total flow rate of 115 liters per minute 
for tight-fitting facepieces and 170 li42 
CFR Ch. I (10�1�10 Edition) 

ters per minute for loose-fitting hoods 
and helmets. 

(4) The maximum allowable penetration 
after six hours of testing according 
to paragraph (b)(3) of this section 
shall not exceed 1 ppm vinyl chloride. 
� 84.255 Requirements for end-of-service-
life indicator. 

(a) Each canister or cartridge submitted 
for testing and approval in accordance 
with �� 84.252, 84.253, and 84.254 
shall be equipped with a canister or 
cartridge end-of-service-life indicator 
which shows a satisfactory indicator 
change or other obvious warning before 
1 ppm vinyl chloride penetration occurs. 
The indicator shall show such 
change or afford such warning at 80 �10 
percent of the total service life to 1 
ppm leakage, as determined by continuing 
each test described in 
�� 84.252(b), 84.253(b), and 84.254(b) until 
a 1 ppm leakage of vinyl chloride occurs. 
(b) The applicant shall provide sufficient 
pretest data to verify the performance 
of the end-of-service-life indicator 
required in paragraph (a) of this 
section. 
� 84.256 Quality control requirements. 

(a) In addition to the construction 
and performance requirements specified 
in �� 84.251, 84.252, 84.253, 84.254, and 
84.255, the quality control requirements 
in paragraphs (b), (c), and (d) of this 
section apply to approval of gas masks, 
chemical cartridge respirators, and 
powered air-purifying respirators for 
entry into and escape from vinyl chloride 
atmospheres containing adequate 
oxygen to support life. 
(b) The respirators submitted for approval 
as described in paragraph (a) of 
this section shall be accompanied by a 
complete quality control plan meeting 
the requirements of subpart E of this 
part. 
(c)(1) The applicant shall specify in 
the plan that a sufficient number of 
samples will be drawn from each bulk 
container of sorbent material and that 
where activated carbon is used, the following 
specific tests will be performed: 

(i) Apparent density; 
(ii) Iodine number; 
(iii) Moisture content; 
592 




Public Health Service, HHS 

(iv) Carbon tetrachloride number; 
and 
(v) Mesh size. 
(2) The tests in paragraph (c)(1) of 
this section shall be performed in a 
quantity necessary to assure continued 
satisfactory conformance of the canisters 
and cartridges to the requirements 
of this subpart. 
(d) Final performance quality control 
tests on the complete canisters and 
cartridges shall be accomplished using 
the bench tests and procedures prescribed 
in �� 84.252, 84.253, 84.254, and 
84.255. 

� 84.257 Labeling requirements. 

(a) A warning shall be placed on the 
label of each gas mask, chemical-cartridge 
respirator, and powered air-purifying 
respirator, and on the label of 
each canister and cartridge, alerting 
the wearer to the need for a fitting test 
in accordance with the manufacturer�s 
facepiece fitting instructions, providing 
service life information, providing 
specific instructions for disposal, 
and advising that the wearer 
may communicate to NIOSH any difficulties 
that may be experienced in 
the design and performance of any gas 
mask, chemical-cartridge respirator, or 
powered air-purifying respirator approved 
under the requirements of this 
subpart. The service lives of respirators 
meeting the test requirements of this 
subpart shall be specified as follows: 
Chemical-cartridge respirator .............1 hour. 
Gas mask............................................4 hours. 
Powered air-purifying respirator .......4 hours. 


(b) Where the service life of a respirator 
is approved for more than four 
hours, the service life for which the 
respirator has been approved will be 
specified. 
� 84.258 Fees. 

The following fees shall be charged 
for the examination, inspection, and 
testing of complete assemblies and 
components of respirators described in 
�� 84.250 and 84.251: 

Complete gas mask ................................$1,100 
Complete chemical-cartridge res


pirator.............................................. 1,150 
Complete powered air-purifying res


pirator.............................................. 1,500 
Canister or cartridge only ...................... 750 


� 84.1100 

Subparts O�JJ [Reserved] 

Subpart KK�Dust, Fume, and Mist;
Pesticide; Paint Spray; Powered 
Air-Purifying High Efficiency 
Respirators and Combination 
Gas Masks 

� 84.1100 Scope and effective dates. 

The purpose of this subpart KK is to 
establish procedures and requirements 
for issuing extensions of approval of 
particulate respirators certified prior 
to July 10, 1995 under the provisions of 
30 CFR part 11 (See 30 CFR part 11 edition, 
as revised July 1, 1994.), new approvals 
and extensions of approval of 
particulate respirators for applications 
that are in NIOSH receipt on July 10, 
1995, and approval of powered air-purifying 
respirators. 

(a) Air-purifying respirators with 
particulate filters approved under the 
provisions of this subpart after July 10, 
1995 will have a 30 CFR part 11 approval 
label. 
(b) Only changes or modifications of 
non-powered air-purifying respirators 
with particulate filters approved under 
the provisions of subparts I, K, L, or M 
of 30 CFR part 11 or paragraph (a) of 
this section and deemed necessary by 
NIOSH to ensure the health and safety 
of the wearer will be approved until 
July 10, 1998 and will have a 30 CFR 
part 11 approval label. 
(c) Only changes or modifications of 
powered air-purifying respirators with 
particulate filters approved under the 
provisions of subparts I, K, L, or M of 
30 CFR part 11 or paragraph (a) of this 
section and deemed necessary by 
NIOSH to ensure the health and safety 
of the wearer will be approved under 
this subpart until July 10, 1998 and will 
have a 30 CFR part 11 label. 
(d) Approval of powered air-purifying 
respirators will be issued under this 
subpart. Particulate filters for powered 
air-purifying respirators approved 
under the provisions of this subpart 
shall be only high-efficiency (HEPA) as 
described in � 84.1130(a)(4) and will 
carry a 42 CFR part 84 approval label. 
In addition, changes or modifications 
of powered HEPA air-purifying respirators 
approved under the provisions 
of this subpart KK will be approved 
593 




� 84.1101 

under this subpart and will have a 42 
CFR part 84 approval label. 

� 84.1101 Definitions. 

As used in this subpart 

(a) Air Contamination Level means the 
standards of contaminant levels prescribed 
by the Secretary of Labor in 
accordance with the provisions of the 
Occupational Safety and Health Act of 
1970 (Pub. L. 91�596; 84 Stat. 1590). 
(b) DOP means a homogenous liquid 
aerosol, having a particle diameter of 
0.3 micrometer, which is generated by 
vaporization and condensation of 
dioctyl phthalate. 
(c) Pesticide means: 
(1) Any substance or mixture of substances 
(including solvents and impurities) 
intended to prevent, destroy, 
repel, or mitigate any insect, rodent, 
nematode, fungus, weed, or other form 
of plant or animal life or virus; and 
(2) Any substance or mixture of substances 
(including solvents and impurities) 
intended for use as a plant regulator, 
defoliant, or desiccant, as defined 
in the Federal Insecticide, Fungicide, 
and Rodenticide Act of 1947, as 
amended (7 U.S.C. 135�135k), excluding 
fumigants which are applied as gases or 
vapors or in a solid or liquid form as 
pellets or poured liquids for subsequent 
release as gases or vapors. 
(d) Radionuclide means an atom identified 
by the constitution of its nucleus 
(specified by the number of protons Z, 
number of neutrons N, and energy, or, 
alternatively, by the atomic number Z, 
mass number A=(N+Z), and atomic 
mass) which exists for a measurable 
time; decays or disintegrates spontaneously, 
emits radiation, and results in 
the formation of new nuclides. 
(e) Smoke means the products of incomplete 
combustion of organic substances 
in the form of solid and liquid 
particles and gaseous products in air, 
usually of sufficient concentration to 
perceptibility obscure vision. 
� 84.1102 Examination, inspection and 
testing of complete respirator assemblies; 
fees. 

The following fees shall be charged 
by the Institute for the examination, 
inspection and testing of complete respirator 
assemblies approved under this 
subpart: 

42 CFR Ch. I (10�1�10 Edition) 

(a) Gas masks with particulate filter, 
including pesticide gas masks� 
(1) Single hazard�$1,100. 
(2) Type N�$4,100. 
(b) Dust, fume and mist respirators� 
(1) Single particulate hazard having 
an Air Contamination Level more than 
0.05 mg./m.3 or 2 million particles per 
cubic foot�$500. 
(2) Combination particulate hazards 
having an Air Contamination Level 
more than 0.05 mg./m.3 or 2 million particles 
per cubic foot�$750. 
(3) Particulate hazards having an Air 
Contamination Level less than 0.05 
mg./m.3 or 2 million particles per cubic 
foot, radon daughters�$1,250. 
(4) All dusts, fumes and mists�$2,000. 
(c) Paint spray respirators�$1,600. 
(d) Pesticide respirators�$1,600. 
(e) Chemical cartridge respirators 
with particulate filter�$1,150. 
� 84.1103 Approval labels and markings; 
approval of contents; use. 

(a) Full-scale reproductions of approval 
labels and markings, and a 
sketch or description of the method of 
application and position on the harness, 
container, canister, cartridge, filter, 
or other component, together with 
instructions for the use and maintenance 
of the respirator shall be submitted 
to MSHA and the Institute for 
approval. 
(b) Approval labels for non-powered 
and powered air-purifying dust, fume, 
mist respirators approved prior to July 
10, 1995 under the provisions of subpart 
K of 30 CFR part 11 (See 30 CFR Part 11 
edition, revised as of July 1, 1994.) shall 
bear the emblem of the Mine Safety 
and Health Administration and the 
seal of the Department of Health and 
Human Services, the applicant�s name 
and address, an approval number assigned 
by the Institute, a statement 
that the respirator was tested and approved 
under subpart K of 30 CFR part 
11 and, where appropriate, restrictions 
or limitations placed upon the use of 
the respirator by the Institute. The approval 
number assigned by the Institute 
shall be designated by the prefix 
TC and a serial number. 
(c) Approval labels for powered air-
purifying respirators approved under 
the provisions of this subpart shall 
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Public Health Service, HHS 

bear the emblem of the National Institute 
for Occupational Safety and 
Health and the seal of the Department 
of Health and Human Services, the applicant�s 
name and address, an approval 
number assigned by the Institute, 
a statement stating the respirator 
was tested under the provisions 
of this subpart, and, where appropriate, 
restrictions or limitations placed upon 
the use of the respirator by the Institute. 
The approval number assigned by 
the Institute shall be designated by the 
prefix TC and a serial number. 

� 84.1130 

(c) The Institute shall, where necessary, 
notify the applicant when additional 
labels, markings, or instructions 
will be required. 
(d) Approval labels and markings 
shall only be used by the applicant to 
whom they were issued. 
(e) Legible reproductions or abbreviated 
forms of the label approved by 
the Institute for use on each respirator 
shall be attached to or printed at the 
following locations: 
Respirator type Label type Location 
Gas mask with a particulate filter, including pesticide 
gas mask. 
Dust, fume, and mist respirators ............................ 
Chemical-cartridge respirator with a particulate filter, 
including paint spray respirator. 
Pesticide respirator ................................................. 
Entire ............................. 
Entire ............................. 
Abbreviated ................... 
Entire ............................. 
Abbreviated ................... 
Entire ............................. 
Abbreviated ................... 
Mask and container. 
Respirator container and filter container. 
Filters. 
Respirator container, cartridge container, and filter 
containers (where applicable). 
Cartridges and filters and filter containers. 
Respirator container, and cartridge and filter containers. 
Cartridges and filters. 

(f) The use of any MSHA and Institute 
approval label obligates the applicant 
to whom it is issued to maintain 
or cause to be maintained the approved 
quality control sampling schedule and 
the acceptable quality level for each 
characteristic tested, and to assure 
that it is manufactured according to 
the drawings and specifications upon 
which the certificate of approval is 
based. 
(g) Each respirator, respirator component, 
and respirator container shall, 
as required by the Institute to assure 
quality control and proper use of the 
respirator, be labeled distinctly to 
show the name of the applicant, and 
the name and letters or numbers by 
which the respirator or respirator component 
is designated for trade purposes, 
and the lot number, serial number, 
or approximate date of manufacture. 
EDITORIAL NOTE: At 60 FR 30388, June 8, 
1995, �84.1103 was added with two paragraph 

(c) designations. 
� 84.1130 Respirators; description. 

(a) Dust, fume, and mist respirators, 
including all completely assembled respirators 
designed for use as respiratory 
protection during entry into and escape 
from atmospheres which contain 
adequate oxygen to support life and 
hazardous particulates, are described 
as follows: 

(1) Air-purifying respirators, either 
with replaceable or reusable filters, designed 
as respiratory protection 
against dusts: 
(i) Having an air contamination level 
not less than 0.05 milligram per cubic 
meter of air, including but not limited 
to coal, arsenic, cadmium, chromium, 
lead, and manganese; or 
(ii) Having an air contamination 
level not less than 2 million particles 
per cubic foot of air, including but not 
limited to aluminum, flour, iron ore, 
and free silica, resulting principally 
from the disintegration of a solid, e.g., 
dust clouds produced in mining, quarrying, 
and tunneling, and in dusts produced 
during industrial operations, 
such as grinding, crushing, and the 
general processing of minerals and 
other materials. 
(2) Air-purifying respirators, with replaceable 
filters, designed as respiratory 
protection against fumes of 
various metals having an air contamination 
level not less than 0.05 milligram 
per cubic meter, including but 
not limited to aluminum, antimony, 
arsenic, cadmium, chromium, copper, 
595 




� 84.1131 

iron, lead, magnesium, manganese, 
mercury (except mercury vapor), and 
zinc, which result from the sublimation 
or condensation of their respective vapors, 
or from the chemical reaction between 
their respective vapors and 
gases. 

(3) Air-purifying respirators, with replaceable 
filters, designed as respiratory 
protection against mists of 
materials having an air contamination 
level not less than 0.05 milligram per 
cubic meter or 2 million particles per 
cubic foot, e.g., mists produced by 
spray coating with vitreous enamels, 
chromic acid mist produced during 
chromium plating, and other mists of 
materials whose liquid vehicle does not 
produce harmful gases or vapors. 
(4) Air-purifying respirators, with replaceable 
filters, designed as respiratory 
protection against dusts, 
fumes, and mists having an air contamination 
level less than 0.05 milligram 
per cubic meter, including but 
not limited to lithium hydride and beryllium, 
and against radionuclides. 
(5) Air-purifying respirators, with replaceable 
filters, designed as respiratory 
protection against radon 
daughters, and radon daughters attached 
to dusts, fumes, and mists. 
(6) Air-purifying respirators, with replaceable 
filters, designed as respiratory 
protection against asbestos-
containing dusts and mists. 
(7) Air-purifying respirators, with replaceable 
filters, designed as protection 
against various combinations of 
particulate matter. 
(8) Air-purifying dust respirators designed 
as respiratory protection 
against pneumoconiosis- and fibrosis-
producing dusts, or dusts and mists, including 
but not limited to aluminum, 
asbestos, coal, flour, iron ore, and free 
silica. 
(b) Gas masks containing filters for 
protection against dusts, fumes, mists, 
and smokes in combination with gases, 
vapors, or gases and vapors. These respirators 
are not for use against gases 
or vapors with poor warning properties 
(except where MSHA or Occupational 
Safety and Health Administration 
standards may permit such use for a 
specific gas or vapor) or those which 
generate high heats of reaction with 
sorbent material in the canister. 
42 CFR Ch. I (10�1�10 Edition) 

(c) Pesticide respirators, including 
all completely assembled respirators 
which are designed for use as respiratory 
protection during entry into 
and escape from atmospheres which 
contain pesticide hazards, are described 
according to their construction 
as follows: 
(1) Front-mounted or back-mounted 
gas masks; 
(2) Chin-style gas mask; 
(3) Chemical cartridge; 
(4) Air-purifying respirator with attached 
blower; and, 
(5) Other devices, including combination 
respirators. 
(d) Respirators with cartridges containing 
or having attached to them, filters 
for protection against mists of 
paints, lacquers, and enamels. These 
respirators are not for use against 
gases or vapors with poor warning 
properties (except where MSHA or Occupational 
Safety and Health Administration 
standards may permit such use 
for a specific gas or vapor) or those 
which generate high heats of reaction 
with sorbent material in the cartridge. 
(e) Respirators with cartridges containing 
or having attached to them filters 
for protection against dusts, 
fumes, and mists, except the mists of 
paints, lacquers, and enamels. These 
respirators are not for use against 
gases or vapors with poor warning 
properties (except where MSHA or Occupational 
Safety and Health Administration 
standards may permit such use 
for a specific gas or vapor) or those 
which generate high heats of reaction 
with sorbent material in the cartridge. 
� 84.1131 Respirators; required components. 


(a) Each respirator described in 
� 84.1130 shall, where its design requires, 
contain the following component 
parts: 
(1) Facepiece, mouthpiece with nose-
clip, hood, or helmet; 
(2) Filter unit, canister with filter, or 
cartridge with filter; 
(3) Harness; 
(4) Attached blower; and 
(5) Breathing tube. 
(b) The components of each respirator 
shall meet the minimum construction 
requirements set forth in 
Subpart G of this part. 
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Public Health Service, HHS 

� 84.1132 Breathing tubes; minimum 
requirements. 

(a) Flexible breathing tubes used in 
conjunction with respirators shall be 
designed and constructed to prevent: 
(1) Restriction of free head movement; 
(2) Disturbance of the fit of 
facepieces, mouthpieces, hoods, or helmets; 
(3) Interference with the wearer�s activities; 
and 
(4) Shutoff of airflow due to kinking, 
or from chin or arm pressure. 
� 84.1133 Harnesses; installation and 
construction; minimum requirements. 


(a) Each respirator shall, where necessary, 
be equipped with a suitable harness 
designed and constructed to hold 
the components of the respirator in position 
against the wearer�s body. 
(b) Harnesses shall be designed and 
constructed to permit easy removal 
and replacement of respirator parts, 
and, where applicable, provide for holding 
a full facepiece in the ready position 
when not in use. 
� 84.1134 Respirator containers; minimum 
requirements. 

(a) Except as provided in paragraph 
(b) of this section each respirator shall 
be equipped with a substantial, durable 
container bearing markings which 
show the applicant�s name, the type of 
respirator it contains, and all appropriate 
approval labels. Except for dust, 
fume, and mist respirators, the commercial 
designation of the respirator it 
contains shall be shown. 
(b) Containers for single-use respirators 
may provide for storage of 
more than one respirator, however, 
such containers shall be designed and 
constructed to prevent contamination 
of respirators which are not removed, 
and to prevent damage to respirators 
during transit. 
(c) Containers for gas masks combinations 
shall be designed and constructed 
to permit easy removal of the 
mask. 
� 84.1136 

� 84.1135 Half-mask facepieces, full 
facepieces, hoods, helmets, and 
mouthpieces; fit; minimum requirements. 


(a) Half-mask facepieces and full 
facepieces shall be designed and constructed 
to fit persons with various facial 
shapes and sizes either: 
(1) By providing more than one face-
piece size; or 
(2) By providing one facepiece size 
which will fit varying facial shapes and 
sizes. 
(b) Full facepieces shall provide for 
optional use of corrective spectacles or 
lenses, which shall not reduce the respiratory 
protective qualities of the respirator. 
(c) Hoods and helmets shall be designed 
and constructed to fit persons 
with various head sizes, provide for the 
optional use of corrective spectacles or 
lenses, and insure against any restriction 
of movement by the wearer. 
(d) Mouthpieces shall be equipped 
with noseclips which are securely attached 
to the mouthpiece or respirator 
and provide an airtight seal. 
(e) Facepieces, hoods, and helmets 
shall be designed to prevent eyepiece 
fogging. 
(f) Half-mask facepieces shall not 
interfere with the fit of common industrial 
safety corrective spectacles, as 
determined by the Institute�s facepiece 
tests in �� 84.1141, 84.1142, and 84.1156(b). 
� 84.1136 Facepieces, hoods, and helmets; 
eyepieces; minimum requirements. 


(a) Facepieces, hoods, and helmets 
shall be designed and constructed to 
provide adequate vision which is not 
distorted by the eyepieces. 
(b) All eyepieces of gas masks combinations 
shall be designed and constructed 
to be impact and penetration 
resistant. Federal Specification, Mask, 
Air Line: and Respirator, Air Filtering, 
Industrial, GGG-M-125d, October 11, 
1965, with interim amendment-1, July 
30, 1969, is an example of an appropriate 
standard for determining impact and 
penetration resistance. Copies of GGG-
M-125d may be obtained from the 
NIOSH, Certification and Quality Assurance 
Branch, 1095 Willowdale Road, 
Morgantown, WV 26505�2888. 
597 




� 84.1137 

� 84.1137 Inhalation and exhalation 
valves; minimum requirements. 

(a) Inhalation and exhalation valves 
shall be protected against distortion. 
(b) Inhalation valves shall be designed 
and constructed and provided 
where necessary to prevent excessive 
exhaled air from adversely affecting 
filters, cartridges, and canisters, except 
where filters of dust, fume, and 
mist respirators are specifically designed 
to resist moisture as prescribed 
in � 84.1145. 
(c) Exhalation valves shall be: 
(1) Provided where necessary; 
(2) Protected against damage and external 
influence; and 
(3) Designed and constructed to prevent 
inward leakage of contaminated 
air. 
� 84.1138 Head harnesses; minimum requirements. 


(a) All facepieces shall be equipped 
with head harnesses designed and constructed 
to provide adequate tension 
during use and an even distribution of 
pressure over the entire area in contact 
with the face. 
(b) Facepiece head harnesses, except 
those employed on single-use dust, 
fume, and mist respirators, shall be adjustable 
and replaceable. 
(c) Mouthpieces shall be equipped, 
where applicable, with adjustable and 
replaceable harnesses, designed and 
constructed to hold the mouthpiece in 
place. 
� 84.1139 Air velocity and noise levels; 

hoods and helmets; minimum re


quirements. 

Noise levels generated by the respirator 
will be measured inside the 
hood or helmet at maximum airflow 
obtainable and shall not exceed 80 dBA. 

� 84.1140 Dust, fume, and mist res


pirators; performance require


ments; general. 

Dust, fume, and mist respirators and 
the individual components of each such 
device shall, as appropriate, meet the 
requirements for performance and protection 
specified in the tests described 
in �� 84.1141 through 84.1152 and prescribed 
in Tables 12 and 13. 

42 CFR Ch. I (10�1�10 Edition) 

� 84.1141 Isoamyl acetate tightness 
test; dust, fume, and mist respirators 
designed for respiratory 
protection against fumes of various 
metals having an air contamination 
level not less than 0.05 milligram 
per cubic meter; minimum requirements. 


(a) The respirator will be modified in 
such a manner that all of the air that 
normally would be inhaled through the 
inhalation port(s) is drawn through an 
efficient activated charcoal-filled canister, 
or cartridge(s), without interference 
with the face-contacting portion 
of the facepiece. 
(b) The modified respirator will be 
worn by persons for at least 2 minutes 
each in a test chamber containing 100 
parts (by volume) of isoamyl-acetate 
vapor per million parts of air. 
(c) The odor of isoamyl-acetate shall 
not be detected by the wearers of the 
modified respirator while in the test 
atmosphere. 
� 84.1142 Isoamyl acetate tightnesstest; respirators designed for respiratory 
protection against dusts, 
fumes, and mists having an air contamination 
level less than 0.05 milligram 
per cubic meter, or against 
radionuclides; minimum requirements. 


(a) The applicant shall provide a 
charcoal-filled canister or cartridge of 
a size and resistance similar to the filter 
unit with connectors which can be 
attached to the facepiece in the same 
manner as the filter unit. 
(b)(1) The canister or cartridge will 
be used in place of the filter unit, and 
persons will each wear a modified half-
mask facepiece for 5 minutes in a test 
chamber containing 100 parts (by volume) 
of isoamyl-acetate vapor per million 
parts of air. 

(2) The following work schedule will 
be performed by each wearer in the test 
chamber: 
(i) Two minutes walking, nodding, 
and shaking head in normal movements; 
and 
(ii) Three minutes exercising and 
running in place. 
(3) The facepiece shall be capable of 
adjustment, according to the applicant�s 
instructions, to each wearer�s 
face, and the odor of isoamyl-acetate 
598 




Public Health Service, HHS 

shall not be detectable by any wearer 
during the test. 

(c) Where the respirator is equipped 
with a full facepiece, hood, helmet, or 
mouthpiece, the canister or cartridge 
will be used in place of the filter unit, 
and persons will each wear the modified 
respiratory-inlet covering for 5 
minutes in a test chamber containing 
1,000 parts (by volume) of isoamyl-acetate 
vapor per million parts of air, performing 
the work schedule specified in 
paragraph (b)(2) of this section. 
� 84.1143 Dust, fume, and mist air-purifying 
filter tests; performance requirements; 
general. 

Dust, fume, and mist respirators will 
be tested in accordance with the schedule 
set forth in Table 13 of this subpart 
to determine their effectiveness as protection 
against the particulate hazards 
specified in Table 13. 

� 84.1144 Silica dust test for dust, 
fume, and mist respirators; single-
use or reusable filters; minimum requirements. 


(a) Three non-powered respirators 
with single-use filters will be tested for 
periods of 90 minutes each at a continuous 
airflow rate of 32 liters per 
minute. 
(b) The relative humidity in the test 
chamber will be 20�80 percent, and the 
room temperature approximately 25 �C. 
(c) The test suspension in the chamber 
will not be less than 50 nor more 
than 60 milligrams of flint (99+ percent 
free silica) per cubic meter of air. 
(d) The flint in suspension will be 
ground to pass 99+ percent through a 
270-mesh sieve. 
(e) The particle-size distribution of 
the test suspension will have a geometric 
mean of 0.4 to 0.6 micrometer, 
and the standard geometric deviation 
will not exceed 2. 
(f) The total amount of unretained 
test suspension in samples taken during 
testing shall not exceed 1.5 milligrams 
for a non-powered air-purifying 
respirator. 
(g) Three non-powered respirators 
with reusable filters will be tested and 
shall meet the requirements specified 
in paragraphs (a) through (f) of this 
section; each filter shall be tested 
three times: Once as received; once 
after cleaning; and once after re� 
84.1147 

cleaning. The applicant�s instructions 
shall be followed for each cleaning. 

� 84.1145 Silica dust test; non-poweredsingle-use dust respirators; minimum 
requirements. 

(a) Three respirators will be tested. 
(b) As described in � 84.1144, airflow 
will be cycled through the respirator 
by a breathing machine at the rate of 
24 respirations per minute with a 
minute volume of 40 liters; a breathing 
machine cam with a work rate of 622 
kg.-m.2/minute shall be used. 
(c) Air exhaled through the respirator 
will be 35� �2 �C. with 94 �3 percent 
relative humidity. # 
(d) Air inhaled through the respirator 
will be sampled and analyzed for respirator 
leakage. 
(e) The total amount of unretained 
test suspension, after drying, in samples 
taken during testing, shall not exceed 
1.8 milligrams for any single test. 
� 84.1146 Lead fume test for dust, 
fume, and mist respirators; minimum 
requirements. 

(a) Three non-powered respirators 
will be tested for a period of 312 minutes 
each at a continuous airflow rate 
of 32 liters per minute. 
(b) The relative humidity in the test 
chamber will be 20�80 percent, and the 
room temperature approximately 25 �C. 
(c) The test suspension in the test 
chamber will not be less than 15 nor 
more than 20 milligrams of freshly generated 
lead-oxide fume, calculated as 
lead (Pb), per cubic meter of air. 
(d) The fume will be generated by impinging 
an oxygen-gas flame on molten 
lead. 
(e) Samples of the test suspension 
will be taken during each test period 
for analysis. 
(f) The total amount of unretained 
test suspension in the samples taken 
during testing, which is analyzed and 
calculated as lead (Pb), shall not exceed 
1.5 milligrams of lead for a non-
powered air-purifying respirator. 
� 84.1147 Silica mist test for dust, 
fume, and mist respirators; minimum 
requirements. 

(a) Three non-powered respirators 
will be tested for a period of 312 minutes 
each at a continuous airflow rate 
of 32 liters per minute. 
599 




� 84.1148 

(b) The room temperature in the test 
chamber will be approximately 25�C. 
(c) The test suspension in the test 
chamber will not be less than 20 nor 
more than 25 milligrams of silica mist, 
weighed as silica dust, per cubic meter 
of air. 
(d) Mist will be produced by spraying 
an aqueous suspension of flint (99+ percent 
free silica), and the flint shall be 
ground to pass 99+ percent through a 
270-mesh sieve. 
(e) Samples of the test suspension 
will be taken during each test period 
for analysis. 
(f) The total amount of silica mist 
unretained in the samples taken during 
testing, weighed as silica dust, shall 
not exceed 2.5 milligrams for a non-
powered air-purifying respirator. 
42 CFR Ch. I (10�1�10 Edition) 

� 84.1148 Tests for respirators designed 
for respiratory protection 
against more than one type of dispersoid; 
minimum requirements. 

Respirators designed as respiratory 
protection against more than one particulate 
hazard (dust, fume, or mist) 
shall comply with all the requirements 
of this part, with respect to each of the 
specific hazards involved. 

� 84.1149 Airflow resistance tests; all 
dust, fume, and mist respirators;
minimum requirements. 

(a) Resistance to airflow will be 
measured in the facepiece, mouthpiece, 
hood, or helmet of a dust, fume, or 
mist respirator mounted on a test fixture 
with air flowing at a continuous 
rate of 85 liters per minute, both before 
and after each test conducted in accordance 
with �� 84.1144 through 84.1147. 
(b) The maximum allowable resistance 
requirements for dust, fume, and 
mist respirators are as follows: 
MAXIMUM RESISTANCE 

[mm. water-column height] 

Type of respirator Initial inhalation 
Final inhalation 
Exhalation 
Pneumoconiosis- and fibrosis-producing dusts, or dusts and mists ............................ 
Dust, fume, and mist, with single-use filter ................................................................... 
Dust, fume, and mist, with reusable filter ..................................................................... 
Radon daughter ............................................................................................................. 
Asbestos dust and mist ................................................................................................. 
12 
30 
20 
18 
18 
15 
50 
40 
1 25 
25 
15 
20 
20 
15 
15 

1 Measured after silica dust test described in � 84.1144. 

� 84.1150 Exhalation valve leakage 
test; minimum requirements. 

(a) Dry exhalation valves and valve 
seats will be subjected to a suction of 
25 mm. water-column height while in a 
normal operating position. 
(b) Leakage between the valve and 
valve seat shall not exceed 30 milliliters 
per minute. 
� 84.1151 DOP filter test; respirators 
designed as respiratory protection 
against dusts, fumes, and mists having 
an air contamination level less 
than 0.05 milligram per cubic meter 
and against radionuclides; minimum 
requirements. 

(a) All single air-purifying respirator 
filter units will be tested in an atmosphere 
concentration of 100 micrograms 
of DOP per liter of air at continuous 
flow rates of 32 and 85 liters per minute 
for a period of 5 to 10 seconds. 

(b) Where filters are to be used in 
pairs, the flow rates will be 16 and 42.5 
liters per minute, respectively, through 
each filter. 
(c) The filter will be mounted on a 
connector in the same manner as used 
on the respirator, and the total leakage 
for the connector and filter shall not 
exceed 0.03 percent of the ambient DOP 
concentration at either flow rate. 
� 84.1152 Silica dust loading test; respirators 
designed as protection 
against dusts, fumes, and mists having 
an air contamination level less 
than 0.05 milligram per cubic meter 
and against radionuclides; minimum 
requirements. 

(a) Three non-powered respirators 
will be tested in accordance with the 
600 




Public Health Service, HHS 

provisions of � 84.1144, or equivalent, 
and shall meet the minimum requirements 
of �� 84.1144 and 84.1149. 

(b) Three powered air-purifying respirators 
will be tested in accordance 
with the provisions of � 84.1144 except 
they will be tested for a period of 4 
hours each at a flowrate not less than 
115 liters per minute to tight-fitting 
facepieces, and not less than 170 liters 
per minute to loose-fitting hoods and 
helmets. The total amount of 
unretained test suspension in samples 
taken during testing shall not exceed 
14.4 milligrams for a powered air-purifying 
respirator with tight-fitting face-
piece, and 21.3 milligrams for a powered 
air-purifying respirator with loose-fitting 
hood or helmet. They shall meet 
the minimum requirements of � 84.1149. 
� 84.1153 Dust, fume, mist, and smoke 
tests; canister bench tests; gas 
masks canisters containing filters; 
minimum requirements. 

(a) Gas mask canisters containing filters 
for protection against dusts, 
fumes, mists, and smokes in combination 
with gases, vapors, or gases and 
vapors, will be tested as prescribed in 
� 84.1140 except for the breathing resistance 
which will be in accordance with 
� 84.122. 
(b) Gas mask canisters designed for 
protection against smokes will be tested 
in an atmospheric concentration of 
100 micrograms of dioctyl phthalate 
per liter of air at continuous flow rates 
of 32 liters per minute and 85 liters per 
minute for a period of 5 to 10 seconds, 
and the DOP leakage through the canister 
shall not exceed 0.03 percent of 
the test concentration. 
(c) Gas mask canisters containing filters 
for protection against dusts, 
fumes, mists, and smokes in combination 
with gases, vapors, or gases and 
vapors, will be tested as prescribed in 
� 84.126. 
� 84.1154 Canister and cartridge requirements. 


(a) Where two or more canisters or 
cartridges are used in parallel, their resistance 
to airflow shall be essentially 
equal. 
(b) The color and markings of all canisters 
and cartridges or labels shall 
conform with the requirements of the 
� 84.1156 

American National Standards Institute, 
American National Standard for 
Identification of Air-Purifying Respirator 
Canisters and Cartridges, ANSI 
K13.1�1973. ANSI K13.1 is incorporated 
by reference and has been approved by 
the Director of the Federal Register in 
accordance with 5 U.S.C. 552(a) and 1 
CFR part 51. Copies may be obtained 
from American National Standards Institute, 
Inc., 1430 Broadway, New York, 
NY 10018. Copies may be inspected at 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888, or 
at the National Archives and Records 
Administration (NARA). For information 
on the availability of this material 
at NARA, call 202�741�6030, or go 
to: http://www.archives.gov/ 
federallregister/ 
codeloflfederallregulations/ 
ibrllocations.html. 

� 84.1155 Filters used with canisters 

and cartridges; location; replace


ment. 

(a) Particulate matter filters used in 
conjunction with a canister or cartridge 
shall be located on the inlet side 
of the canister or cartridge. 
(b) Filters shall be incorporated into 
or firmly attached to the canister or 
cartridge and each filter assembly 
shall, where applicable, be designed to 
permit its easy removal from and replacement 
on the canister or cartridge. 
� 84.1156 Pesticide respirators; performance 
requirements; general. 

Pesticide respirators and the individual 
components of each such device 
shall, as appropriate, meet the following 
minimum requirements for performance 
and protection: 

(a) Breathing resistance test. (1) Airflow 
resistance will be measured in the 
facepiece, mouthpiece, hood, or helmet 
of a pesticide respirator mounted on a 
test fixture with air flowing at a continuous 
rate of 85 liters per minute, 
both before and after each test conducted 
in accordance with paragraphs 
(c) and (f) of this section. 
(2) The maximum allowable resistance 
requirements for pesticide respirators 
are as follows: 
601 




� 84.1156 42 CFR Ch. I (10�1�10 Edition) 

MAXIMUM RESISTANCE 

[mm. water-column height] 

Type of pesticide respirator 
Inhalation 
Exhalation 
Initial Final 1 
Front- or back-mounted gas mask ................................................................................ 
Chin-style gas mask ...................................................................................................... 
Powered air-purifying 2 .................................................................................................. 
Chemical Cartridge ........................................................................................................ 
70 
65 
2 50 
50 
85 
80 
2 70 
7020 
20 
20 
20 

1 Measured at end of the service life specified in Table 14 of this subpart. 
2 Resistance of filter(s), cartridge(s), and breathing tube(s) only with blower not operating. 


(b) Facepiece test. (1) The complete 
pesticide respirator will be fitted to 
the faces of persons having varying facial 
shapes and sizes. 
(2) Where the applicant specifies a 
facepiece size or sizes for his respirator 
together with the approximate measurements 
of faces they are designed to 
fit, the Institute will provide test subjects 
to suit such facial measurements. 
(3) Any pesticide respirator part 
which must be removed to perform the 
facepiece fit test shall be replaceable 
without special tools and without disturbing 
facepiece fit. 
(4) The facepiece or mouthpiece fit 
test using positive or negative pressure 
recommended by the applicant and described 
in his instructions will be used 
during each test. 
(5)(i) Each wearer will enter a chamber 
containing 1,000 p.p.m. isoamyl-acetate 
vapor for a respirator equipped 
with a full facepiece, mouthpiece, 
hood, or helmet and 100 p.p.m. isoamyl-
acetate vapor for a respirator equipped 
with a half-mask facepiece. 

(ii) The facepiece, mouthpiece, hood, 
or helmet may be adjusted, if necessary, 
in the test chamber before 
starting the test. 
(iii) Each wearer will remain in the 
chamber while performing the following 
activities: 
(A) Two minutes, nodding and turning 
head; 
(B) Two minutes, calisthenic arm 
movements; 
(C) Two minutes, running in place; 
and 
(D) Two minutes, pumping with a 
tire pump into a 28-liter (1 cubic foot) 
container. 
(iv) Each wearer shall not detect the 
odor of isoamyl-acetate during the 
test. 
(c) Silica dust test. Three completely 
assembled pesticide respirators will be 
tested with a mechanical-testing apparatus 
as follows: 
(1) Temperature in the test chamber 
will be approximately 25 �C. 
(2) Continuous airflow through the 
respirator will be 32 liters per minute 
for front-mounted, back-mounted, and 
chin-style gas mask pesticide respirators 
and chemical cartridge pesticide 
respirators, and not less than 115 
(4 cubic feet) liters per minute to tight-
fitting facepieces and 170 liters (6 cubic 
feet) per minute to loose-fitting hoods 
and helmets of powered air-purifying 
respirators. 
(3) The test aerosol will contain 50�60 
milligrams of 99+ percent free silica 
per cubic meter of air. 
(4) The particle size distribution of 
the test suspension will have a geometric 
mean diameter of 0.4 to 0.6 micrometer, 
with a standard geometric 
deviation less than 2. 
(5) Front-mounted, back-mounted, 
and chin-style gas mask pesticide respirators 
and chemical cartridge pesticide 
respirators will be tested for 90 
minutes and powered air-purifying respirators 
will be tested for 4 hours. 
(d) Lead fume test. Three completely 
assembled pesticide respirators will be 
tested with a mechanical-testing apparatus 
as follows: 
(1) Continuous airflow through the 
respirator will be 32 liters per minute 
for front-mounted, back-mounted, and 
chin-style gas mask pesticide respirators 
and chemical cartridge pesticide 
respirators and not less than 115 
liters (4 cubic feet) per minute, for 
powered air-purifying respirators with 
tight-fitting facepieces, and not less 
than 170 liters (6 cubic feet) per minute 
for powered air-purifying respirators 
with loose-fitting hoods and helmets. 
602 




Public Health Service, HHS 

(2) The test aerosol will contain 15�20 
milligrams of freshly generated lead-
oxide fume, calculated as lead, per 
cubic meter of air. 
(3) The fume will be generated by impinging 
an oxygen-gas flame on molten 
lead. 
(4) Front-mounted, back-mounted, 
and chin-style gas mask pesticide respirators 
and chemical cartridge pesticide 
respirators will be tested for 90 
minutes and powered air-purifying pesticide 
respirators will be tested for 4 
hours. 
(5) The total amount of unretained 
test suspension, which is analyzed and 
calculated as lead, shall not exceed: 
(i) 0.43 milligram for any 90-minute 
test; 
(ii) 4.8 milligrams for any 4-hour test 
made at 115 liters (4 cubic feet) per 
minute; or 
(iii) 6.2 milligrams for any 4-hour test 
made at 170 liters (6 cubic feet) per 
minute. 
(e) Dioctyl-phthalate test. (1) All canisters 
submitted for use with front-
mounted and back-mounted gas mask 
pesticide respirators will be tested in 
an atmospheric concentration of 100 
micrograms of dioctyl-phthalate per 
liter of air at continuous flow rates of 
32 and 85 liters per minute for a test period 
of 5 to 10 seconds. 
(2) The DOP leakage through the canister 
shall not exceed 0.03 percent of 
the ambient DOP concentration. 
(f) Bench tests for pesticide respirators. 
(1)(i) Bench tests will be made on an 
apparatus that allows the test atmosphere 
at 50 �5 percent relative humidity 
and at room temperature (25��2.5 
�C.) to enter the canister or cartridge 
at predetermined concentrations and 
rates of flow, and that has a means for 
determining the test life of the canister 
or cartridge against carbon tetrachloride. 
(ii) Canisters and cartridges will be 
tested as they are used on each pesticide 
respirator, either singly or in 
pairs. 
(iii) Three canisters or cartridges or 
pairs of cartridges will be removed 
from containers and tested as received 
from the applicant. 
� 84.1157 

(iv) Two canisters, cartridges, or 
pairs of cartridges will be equilibrated 
at room temperature by passing 25 percent 
relative humidity air through 
them at the following flow rates (expressed 
as liters per minute (l.p.m.)) 
for 6 hours: 
Airflow 
Type of canister or cartridge 

rate, 

l.p.m. 
Air-purifying canister .............................................. 


64 
Air-purifying cartridge ............................................ 

25 
Powered air-purifying with tight-fitting facepiece ... 

115 
Powered air-purifying with loose-fitting hood or 
helmet ................................................................ 

170 

(v) Two canisters, cartridges, or pairs 
of cartridges will be equilibrated at 
room temperature by passing 85 percent 
relative humidity air through 
them at the flow rates stated in paragraph 
(f)(1)(iv) of this section for 6 
hours. 
(vi) The equilibrated canisters or cartridges 
will be resealed, kept in an upright 
position at room temperature, 
and tested within 18 hours. 
(2) Canisters and cartridges tested in 
accordance with the provisions of this 
section shall meet the requirements 
specified in Table 14 of this subpart. 
� 84.1157 Chemical cartridge respirators 
with particulate filters; 
performance requirements; general. 

Chemical cartridge respirators with 
particulate filters and the individual 
components of each such device shall, 
as appropriate, meet the following 
minimum requirements for performance 
and protection: 

(a) Breathing resistance test. (1) Resistance 
to airflow will be measured in the 
facepiece, mouthpiece, hood, or helmet 
of a chemical cartridge respirator 
mounted on a test fixture with air 
flowing at a continuous rate of 85 liters 
per minute, both before and after each 
test conducted in accordance with 
paragraphs (d) through (f) of this section. 
(2) The maximum allowable resistance 
requirements for chemical cartridge 
respirators are as follows: 
603 




� 84.1157 42 CFR Ch. I (10�1�10 Edition) 

MAXIMUM RESISTANCE 

[mm. water-column height] 

Type of chemical cartridge respirator 
Inhalation 
Exhalation 
Initial Final 1 
For gases, vapors, or gases and vapors, and dusts, fumes, and mists ...................... 
For gases, vapors, or gases and vapors, and mists of paints, lacquers, and enamels 
50 
50 
70 
70 
20 
20 

1 Measured at end of service life specified in Table 11 in subpart L of this part. 

(b) Facepiece test. The facepiece test 
will be conducted as specified in 
� 84.205. 
(c) Lacquer and enamel mist tests; general. 
(1) Three respirators with cartridges 
containing or having attached 
to them, filters for protection against 
mists of paints, lacquers, and enamels 
shall be tested in accordance with the 
provisions of paragraph (f) of this section. 
(2) In addition to the test requirements 
set forth in paragraph (c)(1) of 
this section, three such respirators will 
be tested against each aerosol in accordance 
with the provisions of paragraphs 
(d) and (e) of this section. 
(d) Lacquer mist test. (1) Temperature 
in the test chamber will be approximately 
25 �C. 
(2) Continuous airflow through the 
respirator will be 32 liters per minute 
for air-purifying respirators, and not 
less than 115 liters per minute to tight 
fitting facepieces and 170 liters per 
minute to loose-fitting hoods and helmets 
of powered air-purifying respirators. 
(3) Airflow through the chamber will 
be 20�25 air changes per minute. 
(4) The atomizer employed will be a 
No. 64�5 nozzle with setup 3, or equivalent, 
operating at 69 kN/m.2 (10 pounds 
per square inch gage). 
(5) The test aerosol will be prepared 
by atomizing a mixture of one volume 
of clear cellulose nitrate lacquer and 
one volume of lacquer thinner. The lacquer 
described in Federal Specification 
TT-L-31, October 7, 1953, is an example 
of an acceptable lacquer. Copies of TT-
L-31 may be inspected or obtained from 
the NIOSH, Certification and Quality 
Assurance Branch, 1095 Willowdale 
Road, Morgantown, WV 26505�2888. 
(6) The concentration of cellulose nitrate 
in the test aerosol will be 95�125 
milligrams per cubic meter. 
(7) The test aerosol will be drawn to 
each respirator for a total of 156 minutes 
for air-purifying respirators and 
240 minutes for powered air-purifying 
respirators. 
(8) The total amount of unretained 
mist in the samples taken during testing, 
weighed as cellulose nitrate, shall 
not exceed 5 milligrams for an air-purifying 
respirator, 28 milligrams for a 
powered air-purifying respirator with 
tight-fitting facepiece, and 41 milligrams 
for a powered air-purifying respirator 
with loose-fitting hood or helmet. 
(e) Enamel mist test. (1) Temperature 
in the test chamber will be approximately 
25 �C. 
(2) Continuous airflow through the 
respirator will be 32 liters per minute 
for air-purifying respirators, and not 
less than 115 liters per minute to tight-
fitting facepieces and 170 liters per 
minute to loose-fitting hoods and helmets 
of powered air-purifying respirators. 
(3) Airflow through the chamber will 
be 20�25 air changes per minute. 
(4) The atomizer employed will be a 
No. 64 nozzle with setup 1A, or equivalent, 
operating at 69 kN/m.2 (10 pounds 
per square inch gage). 
(5) The test aerosol will be prepared 
by atomizing a mixture of 1 volume of 
white enamel and 1 volume of turpentine. 
The enamel described in Federal 
Specification TT-E�489b, May 12, 1953, 
with amendment-1 of 9 November 1955 
is an example of an acceptable enamel. 
Copies of TT-E�489b may be inspected 
or obtained from the NIOSH, Certification 
and Quality Assurance Branch, 
1095 Willowdale Road, Morgantown, WV 
26505�2888. 
(6) The concentration of pigment in 
the test aerosol, weighed as ash, will be 
95�125 milligrams per cubic meter. 
604 




Public Health Service, HHS Pt. 84, Subpt. KK, Tables 

(7) The test aerosol will be drawn to 
each respirator for a total of 156 minutes 
for air-purifying respirators and 
240 minutes for power air-purifying respirators. 
(8) The total amount of unretained 
mist in the samples taken during testing, 
weighed as ash, shall not exceed 1.5 
milligrams for any air-purifying respirator, 
8.3 milligrams for a powered 
air-purifying respirator with tight-fitting 
facepiece, and 12.3 milligrams for 
a powered air-purifying respirator with 
loose-fitting hood or helmet. 
(f) Bench tests; gas and vapor tests. (1) 
Bench tests will be made in accordance 
with � 84.207 and tested cartridges shall 
meet the minimum requirements set 
forth in Table 11 of subpart L of this 
part. Cartridges will be equilibrated in 
accordance with paragraph (f)(2) of this 
section. 
(2)(i) Two powered air-purifying cartridges 
or pairs of cartridges will be 
equilibrated at room temperature by 
passing 25 percent relative humidity 
air through them at the following flow 
rates (expressed in liters per minute 
(l.p.m.)) for 6 hours: 

Airflow 
Type of cartridge rate, 
l.p.m. 
Powered air purifying with tight-fitting facepiece ... 115 
Powered air purifying with loose-fitting hood or 
helmet ................................................................ 170 

(ii) Two powered air-purifying cartridges 
or pairs of cartridges will be 
equilibrated by passing 85 percent relative 
humidity air through them at the 
flow rates stated in paragraph (f)(2)(i) 
of this section. 
(iii) All cartridges will be resealed, 
kept in an upright position, at room 
temperatures, and tested within 18 
hours. 
� 84.1158 Dust, fume, and mist tests; 
respirators with filters; minimum 
requirements; general. 

(a) Three respirators with cartridges 
containing, or having attached to 
them, filters for protection against 
dusts, fumes, and mists, except the 
mists of paints, lacquers, and enamels, 
will be tested in accordance with the 
provisions of � 84.1157(f). 
(b) In addition to the test requirements 
set forth in paragraph (a) of this 
section, three such respirators will be 
tested, as appropriate, in accordance 
with the provisions of �� 84.1141 through 
84.1152; however, the maximum allowable 
resistance of complete dust, fume, 
and mist, and gas, vapor, or gas and 
vapor chemical cartridge respirators 
shall not exceed the maximum allowable 
limits set forth in � 84.1157(a)(2). 
TABLES TO SUBPART KK OF PART 84 

TABLE 12�FACEPIECE TEST REQUIREMENTS 

[42 CFR Part 84, Subpart KK] 

Respirator types 
Pressure 
tightness 
test 1 
Isoamyl acetate test 
84.1141 84.1142 
Dusts: Air Contamination Level not less than 0.05 mg/M3 or 2 mppcf ........................ 
Fumes: Air Contamination Level not less than 0.05 mg/M3 ......................................... 
Mists: Air Contamination Level not less than 0.05 mg/M3 or 2 mppcf ......................... 
Dusts, Fumes, and Mists: Air Contamination Level less than 0.05 mg/M3 or 2 mppcf, 
and radionuclides ....................................................................................................... 
Radon daughters ........................................................................................................... 
Asbestos-containing dusts and mists ............................................................................ 
X 
X 
X 
X 
X 
X 
X 
X 
X 

1 Test is required only where applicable. 

605 




Pt. 85 
42 CFR Ch. I (10�1�10 Edition) 

TABLE 13�AIR-PURIFYING AND POWERED AIR-PURIFYING RESPIRATOR FILTER TESTS REQUIRED FOR 
APPROVAL 
[42 CFR Part 84, Subpart KK] 


Respirator types 
Silica dust tests Lead fume 
test 84.1146 
Silica mist 
test 84.1147 
DOP test 
84.115184.1144 84.1145 84.1152 
Dusts: Air Contamination Level not less 
than 0.05 mg/M3 or 2 mppcf ............. X 
Fumes: Air Contamination Level not 
less than 0.05 mg/M3 ........................ X 
Mists: Air Contamination Level not less 
than 0.05 mg/M3 or 2 mppcf ............. X 
Dusts, Fumes, and Mists: Air Contamination 
Level less than 0.05 mg/M3 or 
2 mppcf, and radionuclides ............... X X 
Radon daughters .................................. 1 X 2 X 
Asbestos-containing dusts and mists ... 2 X 3 X 
Single use dust and mist respirators .... 3 X 3 X 

1 For resistance only. 
2 For penetration only. 
3 Test required only where applicable. 


TABLE 14�CARBON TETRACHLORIDE BENCH TESTS AND REQUIREMENTS FOR CANISTERS AND 
CARTRIDGES 
[42 CFR part 84, Subpart KK] 


Type of pesticide respirator 
Test concentration 
p.p.m. CCl4 
Flow rate 
l.p.m. 
Number of 
tests 
Minimum 
life minutes 
1 
Chest-mounted or back-mounted gas mask (as received) .................. 
Chest-mounted or back-mounted gas mask (equilibrated) .................. 
Chin-style gas mask (as received) ....................................................... 
Chin-style gas mask (equilibrated) ....................................................... 
Chemical Cartridge respirator (as received) ......................................... 
Chemical cartridge respirator (equilibrated) .......................................... 
Powered air-purifying respirator (tight-fitting facepiece, as received) .. 
Powered air-purifying respirator (tight-fitting facepiece, equilibrated) .. 
Powered air-purifying respirator (loose-fitting hood or helmet, as received) 
............................................................................................... 
Powered air-purifying respirator (loose-fitting hood or helmet, equilibrated) 
............................................................................................... 
20,000 
20,000 
5,000 
5,000 
1,000 
1,000 
1,000 
1,000 
1,000 
1,000 
64 
32 
64 
32 
64 
32 
2 115 
2 115 
3 170 
3 170 
3 
4 
3 
4 
3 
4 
3 
4 
3 
4 
12 
12 
12 
12 
50 
50 
50 
25 
50 
25 

1 Minimum life will be determined at 5 p.p.m. leakage. 
2 The flow rate shall be the effective flow rate of the device, but shall be not less than 115 l.p.m. 
3 The flow rate shall be the effective flow rate of the device, but shall be not less than 170 l.p.m. 


PART 85�REQUESTS FOR HEALTH 
HAZARD EVALUATIONS 


Sec. 

85.1 Applicability. 
85.2 Definitions. 
85.3 
Procedures for requesting health hazard 
evaluations. 
85.3�1 
Contents of a request for health hazard 
evaluations. 

85.4 Acting on requests. 
85.5 Authority for investigations. 
85.6 Advance notice of visits. 
85.7 Conduct of investigations. 
85.8 
Provision of suitable space for employee 
interviews and examinations; 
identification of employees. 
85.9 
Representatives of employers and employees; 
employee requests. 
85.10 Imminent dangers. 
85.11 
Notification of determination to employers, 
affected employees, and Department 
of Labor. 
85.12 
Subsequent requests for health hazard 
evaluations. 
AUTHORITY: Sec. 8(g), 84 Stat. 1600; 29 

U.S.C. 657(g) and sec. 508, 83 Stat. 803; 30 
U.S.C. 957. 
SOURCE: 37 FR 23640, Nov. 7, 1972, unless 
otherwise noted. 

� 85.1 Applicability. 

This part 85 applies to health hazard 
evaluations requested by any employer 
or authorized representative of employees 
under section 20(a)(6) of the Occupational 
Safety and Health Act of 
1970 or section 501(a)(11) of the Federal 
Mine Safety and Health Act of 1977. 

606