Respiratory protective devices - Vocabulary and graphical symbols (ISO 16972:2020)

This document defines terms and specifies units of measurement for respiratory protective devices (RPDs), excluding diving apparatus. It indicates graphical symbols that can be required on RPDs, parts of RPD or instruction manuals in order to instruct the person(s) using the RPD as to its operation.
NOTE Terms and definitions for diving apparatus are given in EN 250.

Atemschutzgeräte - Begriffe und graphische Symbole (ISO 16972:2020)

Dieses Dokument legt Begriffe und Einheiten für Atemschutzgeräte (ASG), mit Ausnahme von Tauchgeräten, fest. Ferner werden graphische Symbole angegeben, die auf Atemschutzgeräten (ASG) oder Teilen davon oder in Bedienungsanleitungen gefordert sein können, um die Person(en), die ein ASG nutzt (nutzen), in dessen Bedienung einzuweisen.
ANMERKUNG Begriffe für Tauchgeräte sind in EN 250 angegeben.

Appareils de protection respiratoire - Vocabulaire et symboles graphiques (ISO 16972:2020)

Le présent document définit les termes et spécifie les unités de mesure à utiliser pour les appareils de protection respiratoire (APR), les appareils de plongée étant exclus. Il indique les symboles graphiques pouvant être requis sur les APR ou sur certaines parties de ces appareils, ou pouvant figurer dans les manuels d'instruction destinés à former la ou les personnes utilisant les APR au fonctionnement de ces appareils.
NOTE Les termes et définitions relatifs aux appareils de plongée sont donnés dans l'EN 250.

Oprema za varovanje dihal - Slovar in grafični simboli (ISO 16972:2020)

General Information

Status
Published
Publication Date
24-Mar-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
25-Mar-2020
Completion Date
25-Mar-2020

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SLOVENSKI STANDARD
SIST EN ISO 16972:2020
01-junij-2020
Nadomešča:
SIST EN 132:1999
Oprema za varovanje dihal - Slovar in grafični simboli (ISO 16972:2020)

Respiratory protective devices - Vocabulary and graphical symbols (ISO 16972:2020)

Atemschutzgeräte - Begriffe und graphische Symbole (ISO 16972:2020)
Appareils de protection respiratoire - Vocabulaire et symboles graphiques (ISO
16972:2020)
Ta slovenski standard je istoveten z: EN ISO 16972:2020
ICS:
01.040.13 Okolje. Varovanje zdravja. Environment. Health
Varnost (Slovarji) protection. Safety
(Vocabularies)
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
SIST EN ISO 16972:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 16972:2020
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SIST EN ISO 16972:2020
EN ISO 16972
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 01.040.13; 13.340.30
English Version
Respiratory protective devices - Vocabulary and graphical
symbols(ISO 16972:2020)

Appareils de protection respiratoire - Vocabulaire et Atemschutzgeräte - Begriffe und graphische Symbole

symboles graphiques (ISO 16972:2020) (ISO 16972:2020)
This European Standard was approved by CEN on 23 February 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16972:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 16972:2020
EN ISO 16972:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 16972:2020
EN ISO 16972:2020 (E)
European foreword

This document (EN ISO 16972:2020) has been prepared by Technical Committee ISO/TC 94 "Personal

safety -- Personal protective equipment" in collaboration with Technical Committee CEN/TC 79

“Respiratory protective devices” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by September 2020, and conflicting national standards

shall be withdrawn at the latest by September 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 132:1998.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 16972:2020 has been approved by CEN as EN ISO 16972:2020 without any modification.

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SIST EN ISO 16972:2020
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SIST EN ISO 16972:2020
INTERNATIONAL ISO
STANDARD 16972
Second edition
2020-03
Respiratory protective devices —
Vocabulary and graphical symbols
Appareils de protection respiratoire — Vocabulaire et symboles
graphiques
Reference number
ISO 16972:2020(E)
ISO 2020
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms related to respiratory protective devices ................................................................................................................. 1

4 Terms related to human factors ........................................................................................................................................................25

5 Graphical symbols for use on respiratory protective devices ............................................................................31

Bibliography .............................................................................................................................................................................................................................32

Index .................................................................................................................................................................................................................................................33

© ISO 2020 – All rights reserved iii
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 94, Personal safety — Personal protective

equipment, Subcommittee SC 15, Respiratory protective devices, in collaboration with the European

Committee for Standardization (CEN) Technical Committee CEN/TC 79, Respiratory protective devices,

in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 16972:2010), which has been technically

revised. The main changes compared with the previous edition are as follows:

— the terms used in the field of respiratory protective devices (RPD) have been updated;

— Clause 5, “Units of measurement”, has been deleted;

— Annex A, “Terms and definitions referring to respiratory protective devices in current national

standards, regulations or other national contexts”, has been deleted;
— Annex B, “Abbreviations used”, has been deleted.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
INTERNATIONAL STANDARD ISO 16972:2020(E)
Respiratory protective devices — Vocabulary and
graphical symbols
1 Scope

This document defines terms and specifies units of measurement for respiratory protective devices

(RPDs), excluding diving apparatus. It indicates graphical symbols that can be required on RPDs, parts

of RPD or instruction manuals in order to instruct the person(s) using the RPD as to its operation.

NOTE Terms and definitions for diving apparatus are given in EN 250.
2 Normative references
There are no normative references in this document.
3 Terms related to respiratory protective devices

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
abrasive blasting respiratory protective device

breathing apparatus (3.32) incorporating a protective hood (3.115) or a blouse (3.23) fitted with an

impact resistant (3.119) visor (3.252)

Note 1 to entry: Breathable air (3.28) is supplied to the wearer (3.257) from a source of air not carried by the wearer.

3.2
accessory

item, or items, that are attached to the respiratory protective device (RPD) (3.203) that are not necessary

for the RPD to meet the requirements of the RPD performance standard and do not compromise its

protection
3.3
adequacy assessment

selection method identifying the respiratory protective device (3.203) is able to reduce the wearer's

(3.257) inhalation exposure to acceptable levels
3.4
adequate respiratory protective device
adequate RPD
RPD (3.203) capable of reducing the inhalation exposure to an acceptable level
3.5
aerodynamic diameter

diameter of a unit density sphere having the same settling velocity as the particle (3.170) in question

3.6
aerosol

suspension of solid, liquid, or solid and liquid particles (3.170) in a gaseous medium, having a negligible

falling velocity (generally considered to be less than 0,25 m/s)
© ISO 2020 – All rights reserved 1
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.7
aerosol penetration
ability of particles (3.170) to pass through a particle-filtering material
3.8
air flow resistance

pressure difference between upstream and downstream locations caused by the flow of air through

the parts and components of a respiratory protective device (3.203) such as an exhalation valve (3.79),

inhalation valve (3.120), filter(s) (3.86), and tube (3.245), etc.
3.9
air supply hose
fresh air supply hose
hose (3.116) for the supply of air at about atmospheric pressure
3.10
ambient air bypass

means to enable the wearer (3.257) to breathe the ambient atmosphere (3.12) before entering and after

leaving a hazardous atmosphere (3.108)
3.11
ambient air system

device used to deliver ambient air at a low pressure (3.134) directly to a breathable gas (3.29) respiratory

protective device (3.203) (manually or power assisted)
3.12
ambient atmosphere
air surrounding the wearer (3.257)
3.13
ambient concentration
concentration of a compound in the air surrounding the wearer (3.257)
3.14
ambient laboratory conditions

atmosphere where the temperature is between 16 °C and 32 °C and the relative humidity is between

20 % and 80 %
3.15
apertometer

extended hemispherical dome for measuring the angular area of the field of vision (3.85) [peripheral

isopter (3.176)] of a respiratory protective device (3.203) when mounted on a respiratory protective

device headform (3.204)
3.16
as received
not preconditioned or modified to carry out a test
3.17
assigned protection factor
APF

anticipated level of respiratory protection that would be provided by a properly functioning respiratory

protective device (RPD) (3.203) or class of RPD within an effective RPD programme (3.207)

3.18
assisted filtering respiratory protective device
assisted filtering RPD

filtering RPD (3.90) where breathable gas (3.29) is actively supplied to the wearer (3.257) by the

RPD (3.203)
2 © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.19
averaged interactive flow rate

interactive flow rate (3.126) averaged over 10 consecutive breathing cycles (3.34) of the breathing

machine (3.38)
3.20
averaged maximum interactive flow rate

average of the highest flow rate (3.92) within each breathing cycle (3.34) of 10 consecutive breathing

cycles of the breathing machine (3.38)
3.21
averaged minimum interactive flow rate

average of the lowest flow rate (3.92) within each breathing cycle (3.34) of 10 consecutive breathing

cycles of the breathing machine (3.38)
3.22
averaged peak interactive flow rate

average of the maximum peak flow rate (3.92) within each breathing cycle (3.34) of 10 consecutive

breathing cycles of the breathing machine (3.38)
3.23
blouse

garment, used as a facepiece (3.83), that covers the head and upper part of the body to the waist and

wrists and to which air is supplied
3.24
body harness

means to enable certain components of a respiratory protective device (3.203) to be worn on the body

3.25
body temperature pressure saturated
BTPS
standard condition for the expression of ventilation (4.20) parameters

Note 1 to entry: Body temperature (37 °C), atmospheric pressure 101,3 kPa and water vapour pressure (6,27 kPa)

in saturated air.
3.26
breakthrough concentration

concentration of test gas (3.97) in effluent air at which a gas filter (3.98) undergoing a gas capacity

(3.44) test is deemed exhausted
3.27
breakthrough time

time taken from the start of the test until the test gas (3.97) and specified reaction products are

detected at the specified breakthrough concentration (3.26) at the downstream side of the filter (3.86)

under test
3.28
breathable air
air of a quality that makes it suitable for safe respiration

Note 1 to entry: For compressed air for breathing apparatus (3.32), see EN 12021:2014.

3.29
breathable gas

mixture of gases (3.97) that is suitable for respiration without adverse effects to health

© ISO 2020 – All rights reserved 3
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.30
breathable gas cylinder

integral part of the respiratory protective device (3.203) that contains the breathable gas (3.29) supply

3.31
breathable gas quality
composition of a breathable gas (3.29) as defined in relevant standards
3.32
breathing apparatus

device that enables the wearer (3.257) to breathe independently of the ambient atmosphere (3.12)

3.33
breathing bag

component of a respiratory protective device (3.203) that compensates for variations in the breathable

gas (3.29) supply or demand and provides for peak inhalation flow requirements
3.34
breathing cycle
respiratory period comprising an inhalation and an exhalation phase
3.35
breathing frequency
number of breathing cycles (3.34) taken in a minute
Note 1 to entry: It is expressed in breaths per minute.
3.36
breathing gas regeneration

process whereby a respiratory protective device (3.203) absorbs carbon dioxide from exhaled gas (3.97),

delivers oxygen, and controls the water vapour and temperature of gas to be rebreathed

3.37
breathing hose

flexible hose (3.116) connected to the facepiece (3.83) through which breathable gas

(3.29) enters at atmospheric pressure or at a pressure slightly above or below
3.38
breathing machine

ventilation machine that simulates respiratory ventilation (4.20) using waveforms, which can be

sinusoidal or representative of the breathing cycle (3.34)
Note 1 to entry: See also metabolic simulator (3.149).
3.39
breathing machine assembly

breathing machine (3.38) plus all the connecting tubes (3.245), control valves and other necessary

hardware leading to the trachea tube assembly (3.244)
3.40
breathing peak resistance

maximum differential pressure of a respiratory protective device (3.203) during inhalation (inhalation

peak resistance) or exhalation (exhalation peak resistance)
3.41
breathing resistance

pressure differential between the upstream and downstream location caused by a respiratory

protective device (3.203) to the flow of breathable gas (3.29) during inhalation (inhalation resistance) or

exhalation (exhalation resistance)
4 © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.42
breath-responsive
actively or passively responsive following the wearer's (3.257) demand for air
3.43
bypass valve

component part of a respiratory protective device (3.203) that is furnished as an emergency manual

valve to supply necessary breathable gas (3.29) when the ordinary supply path is out of order

3.44
capacity

volume of available breathable gas (3.29) of a respiratory protective device (3.203)

3.45
carbon dioxide concentration limits
CO concentration limits

maximum allowed concentration of carbon dioxide within inhaled breathable gas (3.121)

3.46
char length

length of brittle residue found when a fabric or material is exposed to thermal energy

3.47
checking device

means to enable the wearer (3.257) to verify, before use or periodically during use, that the

manufacturer’s minimum design conditions (3.137) are met
3.48
class Sxxxx respiratory protective device
class Sxxxx RPD

supplied breathable gas RPD (3.236), where Sxxxx equals the amount of breathable gas (3.29) available

for respiration in litres
3.49
cleaning/disinfection resistance

ability of the device to withstand the cleaning and disinfection processes defined by the manufacturer

3.50
combined filter

filter (3.86) intended to remove dispersed solid and/or liquid particles (3.170) and specified gases (3.97)

and vapours (3.251) from the flow of air passing through it
3.51
combined respiratory protective device
combined RPD

RPD (3.203) that is capable of operating in either a filtering or breathable gas (3.29) supply mode

3.52
compatibility

ability of a respiratory protective device (3.203) to be used in conjunction with another item of personal

protective equipment (PPE)
3.53
competent fit-test operator

person with suitable and sufficient experience and with practical and theoretical knowledge of fit-test

methods who conducts the fit-testing procedures
3.54
competent person

person with suitable and sufficient experience and with practical and theoretical knowledge of the

elements of a respiratory protective device programme (3.207) for which (s)he is responsible

© ISO 2020 – All rights reserved 5
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.55
compressed air filter

filter (3.86) intended to remove dispersed solid and/or liquid particles (3.170) and specified gases (3.97)

and vapours (3.251) from compressed air passing through it
3.56
compressed air line breathing apparatus

device that is not self-contained and in which the facepiece (3.83) is supplied with breathable air (3.28)

from a source of compressed air
3.57
compressed air supply tube

tube (3.245) that delivers breathable air (3.28) at a maximum pressure of 10 bar from a source of

compressed air
3.58
confined space

area with limited access, as described in national regulations, which requires special considerations

for entry
3.59
contaminant
undesirable solid, liquid or gaseous substance in the air
3.60
continuous control flow valve

control valve that provides the wearer (3.257) of a supplied breathable gas respiratory protective device

(3.236) with breathable gas (3.29) and allows the wearer to regulate a continuous air flow within

prescribed limits
3.61
count median diameter
CMD

particle size of a particle distribution for which one-half the total number of particles (3.170) are larger

and one-half are smaller
3.62
dead space

space in which exhaled gas (3.97) has not been purged and is subject to being rebreathed

3.63
dead space

conducting regions of the pulmonary airways that do not contain alveoli (4.7) and,

therefore, where no gas (3.97) exchange occurs

Note 1 to entry: These areas include the nose, mouth, trachea, large bronchia and the lower branching airways.

This volume is typically 150 ml in a male of average size.
3.64
dead space

sum of all anatomical dead space (3.63) as well as under-perfused (reduced blood flow)

alveoli (4.7) that are not participating in gas (3.97) exchange

Note 1 to entry: The volume of the physiological dead space can vary with the degree of ventilation (4.20). Thus,

the physiological dead space is the fraction of the tidal volume (3.240) that does not participate in gas exchange

in the lungs.
6 © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.65
demand type with positive pressure

type of respiratory protective device (3.203) that is fitted with a demand valve (3.67), is governed by

the breathing action of the lungs, and that actuates at a positive pressure (3.179) in the facepiece (3.83)

under conditions defined in relevant standards
3.66
demand type without positive pressure

type of respiratory protective device (3.203) that is fitted with a demand valve (3.67), is governed by the

breathing action of the lungs, and that actuates at a negative pressure (3.161) during inhalation in the

facepiece (3.83)
3.67
demand valve

valve that is governed by the breathing action of lungs and that supplies breathable gas (3.29) on demand

3.68
desorption

process in which one substance (the filter medium) releases an absorbed or adsorbed substance

3.69
dew point
temperature of air at a specified pressure below which condensation will occur
3.70
doffing
process of removing or taking off the respiratory protective device (3.203)
3.71
donning
process of putting on the respiratory protective device (3.203)
3.72
downstream valve

valve that opens with the pressure of the air and is normally kept shut by means of a spring

3.73
drip
to run or fall in drops or blobs
3.74
dynamic breathing resistance

differential pressure caused by a respiratory protective device (3.203) when the breathable gas (3.29)

is delivered by a breathing machine (3.38) adjusted to a specified breathing minute volume (3.153) and

waveform
3.75
dynamic flame test
test where the specimen is moving over the flame for the exposure
3.76
elastance
pressure change resulting from a volume change
Note 1 to entry: It is expressed in kPa/l.
© ISO 2020 – All rights reserved 7
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.77
end-of-service-life indicator
ESLI

system that warns the wearer (3.257) of the gas filtering respiratory protective device (3.102) of the

approach of the end of respiratory protection
3.78
escape respiratory protective device
escape RPD

RPD (3.203) designed to be used only during an escape from hazardous atmospheres (3.108)

3.79
exhalation valve

non-return valve that allows the release of exhaled and excess breathable gas (3.29) from the respiratory

protective device (3.203)
3.80
exhaled air
air breathed out by the wearer (3.257)
3.81
exposed part

part that can be touched in an as-worn state by the exposed surface identification probe specified in

ISO 16900-5
3.82
face blank
main body of a facepiece (3.83) to which the functional components are attached
3.83
facepiece

part of a respiratory protective device (3.203) that connects the wearer's (3.257) respiratory tract to the

other parts of the device and isolates the respiratory tract from ambient atmosphere (3.12)

Note 1 to entry: Facepieces may be full face masks (3.96), half masks (3.104), quarter masks (3.192), mouthpiece

assemblies (3.157) or filtering facepieces (3.89).

Note 2 to entry: Helmets (3.113), hoods (3.115), blouses (3.23) and suits may serve the same purpose.

3.84
face-seal leakage
leakage between the wearer's (3.257) face and the respiratory interface (3.202)
3.85
field of vision
area of fixed sight while wearing a respiratory protective device (3.203)
3.86
filter

device intended to remove specific contaminants (3.59) from the ambient air passing through it

3.87
filter holder
filter housing

component that is attached to either a respiratory interface (3.202) or another part of the respiratory

protective device (3.203) and into which a filter (3.86), either encapsulated or un-encapsulated, is

inserted
8 © ISO 2020 – All rights reserved
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.88
filter self rescuer

respiratory protective device (3.203) exclusively intended for escape, incorporating a filter (3.86) against

carbon monoxide through which the ambient air is drawn to a facepiece (3.83)
3.89
filtering facepiece

respiratory protective device (3.203) entirely or substantially constructed of filtering material

Note 1 to entry: Marked "FF" for filtering facepiece.
3.90
filtering respiratory protective device
filtering RPD

assisted or unassisted RPD (3.203) in which air passes through a gas filter(s) (3.98), particle filter(s)

(3.171) or combined filter(s) (3.50) before being inhaled
3.91
fit test

use of a challenge agent and specific protocol to qualitatively or quantitatively determine the

effectiveness of the seal between the wearer's (3.257) face and respiratory interface (3.202) with a

specific make, model and size of a respiratory protective device (3.203)
3.92
flow rate

volume (mass) of breathable gas (3.29) passing through the device in a given time

3.93
fogging

reduction of the field of vision (3.85) and/or visual acuity caused by the condensation of humidity on the

visor (3.252)
3.94
force-fitting

practice of repeating a failed fit test (3.91) with the same respiratory protective device (RPD) (3.203)

more than three times, re-donning, or otherwise adjusting the RPD (e.g. over-tightening the straps),

until a passing fit test is finally achieved
3.95
fresh air hose breathing apparatus

respiratory protective device (3.203) in which breathable air (3.28) is obtained through an air supply

hose (3.9) either assisted or unassisted
3.96
full face mask

tight-fitting respiratory interface (3.241) covering the mouth, nose, eyes and chin

3.97
gas

fluid that is in a gaseous state at a standard temperature and pressure that expands to occupy the space

or enclosure in which it is confined
3.98
gas filter

filter (3.86) intended to remove specific gases (3.97) and vapours (3.251) from the atmosphere passing

through it
© ISO 2020 – All rights reserved 9
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SIST EN ISO 16972:2020
ISO 16972:2020(E)
3.99
gas filter capacity

mass or volume of a specific test agent that is removed or retained by a gas filter (3.98) or combined

filter (3.50) under specified conditions of temperature, humidity, challenge test gas concentration and

flow rate (3.92) at breakthrough concentration (3.26)

Note 1 to entry: The mass or volume is determined by measuring the breakthrough tim

...

SLOVENSKI STANDARD
oSIST prEN ISO 16972:2018
01-julij-2018

Oprema za varovanje dihal - Definicije izrazov in piktogrami (ISO/DIS 16972:2018)

Respiratory protective devices - Definitions of terms and pictograms (ISO/DIS
16972:2018)

Atemschutzgeräte - Definitionen von Begriffen und Piktogramme (ISO/DIS 16972:2018)

Appareils de protection respiratoire - Définitions de termes et pictogrammes (ISO/DIS

16972:2018)
Ta slovenski standard je istoveten z: prEN ISO 16972
ICS:
01.040.13 Okolje. Varovanje zdravja. Environment. Health
Varnost (Slovarji) protection. Safety
(Vocabularies)
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
oSIST prEN ISO 16972:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 16972:2018
---------------------- Page: 2 ----------------------
oSIST prEN ISO 16972:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16972
ISO/TC 94/SC 15 Secretariat: DIN
Voting begins on: Voting terminates on:
2018-05-02 2018-07-25
Respiratory protective devices — Definitions of terms and
pictograms
Appareils de protection respiratoire — Définitions de termes et pictogrammes
ICS: 13.340.30
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16972:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018
---------------------- Page: 3 ----------------------
oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
Contents Page

Foreword ......................................................................................................................................................................... iv

Introduction ..................................................................................................................................................................... v

1 Scope ....................................................................................................................................................................7

2 Normative references ....................................................................................................................................7

3 Terms and definitions ....................................................................................................................................8

4 Terms related to human factors .............................................................................................................. 29

5 Graphical symbols for use on RPD .......................................................................................................... 35

© ISO 2018 – All rights reserved
iii
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national

standards bodies (ISO member bodies). The work of preparing International Standards is normally

carried out through ISO technical committees. Each member body interested in a subject for which a

technical committee has been established has the right to be represented on that committee.

International organizations, governmental and non-governmental, in liaison with ISO, also take part in

the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all

matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the World Trade Organization (WTO)

principles in the Technical Barriers to Trade (TBT) see the following URL:
www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 94/SC 15 Respiratory protective devices and has

been prepared in close cooperation with CEN/TC 79 Respiratory protective devices.

This second edition cancels and replaces the first edition (ISO 16972:2010), which has been technically

revised.
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
Introduction

This document has been amended by the responsible working groups within ISO/TC 94/SC 15 and

CEN/TC 79 and is a consolidation of ISO 16972:2010 and EN 132:1998.
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
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oSIST prEN ISO 16972:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 16972:2018(E)
Respiratory protective devices — Definitions of terms and
pictograms
1 Scope

This document is applicable to respiratory protective devices except diving apparatus.

NOTE Definitions for diving apparatus are given in EN 250.

This document defines commonly used terms and definitions and specifies units of measurement to

achieve a uniform interpretation and to prevent ambiguous use. It indicates graphical symbols that may

be required to be placed on respiratory protective devices (RPD) or parts of RPD or instruction manuals

in order to instruct the person(s) using the RPD as to its operation.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 16900-1:2014, Respiratory protective devices — Methods of test and test equipment — Part 1:

Determination of inward leakage

ISO 16900-2:2017, Respiratory protective devices — Methods of test and test equipment — Part 2:

Determination of breathing resistance

ISO 16900-4:2011, Respiratory protective devices — Methods of test and test equipment — Part 4:

Determination of gas filter capacity and migration, desorption and carbon monoxide dynamic testing

ISO 16900-5:2016, Respiratory protective devices — Methods of test and test equipment — Part 5:

Breathing machine, metabolic simulator, RPD headforms and torso, tools and verification tools

ISO 16900-6:2015, Respiratory protective devices — Methods of test and test equipment — Part 6:

Mechanical resistance/strength of components and connections

ISO 16900-8:2015, Respiratory protective devices — Methods of test and test equipment — Part 8:

Measurement of RPD air flow rates of assisted filtering RPD

ISO 16900-10:2015, Respiratory protective devices — Methods of test and test equipment — Part 10:

Resistance to ignition, flame, radiant heat and heat

ISO 16900-11:2013, Respiratory protective devices — Methods of test and test equipment — Part 11:

Determination of field of vision

ISO 16900-12:2016, Respiratory protective devices — Methods of test and test equipment — Part 12:

Determination of volume—averaged work of breathing and peak respiratory pressures

© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)

ISO 16900-13:2015, Respiratory protective devices — Methods of test and test equipment — Part 13: RPD

using regenerated breathable gas and special application mining escape RPD: Consolidated test for gas

concentration, temperature, humidity, work of breathing, breathing resistance, elastance and duration

ISO/TS 16975-1:2016, Respiratory protective devices — Selection, use and maintenance — Part 1:

Establishing and implementing a respiratory protective device programme

ISO/TS 16975-2:2016, Respiratory protective devices — Selection, use and maintenance — Part 2:

Condensed guidance to establishing and implementing a respiratory protective device programme

ISO 16975-3:2017, Respiratory protective devices — Selection, use and maintenance — Part 3: Fit—

testing procedures

SO/TS 16976-1:2015, Respiratory protective devices — Human factors — Part 1: Metabolic rates and

respiratory flow rates

ISO/TS 16976-3:2011, Respiratory protective devices — Human factors — Part 3: Physiological responses

and limitations of oxygen and limitations of carbon dioxide in the breathing environment

ISO/TS 16976-4:2012, Respiratory protective devices — Human factors — Part 4: Work of breathing and

breathing resistance: Physiologically based limits

ISO/TS 16976-5:2013, Respiratory protective devices — Human factors — Part 5: Thermal effects

ISO/TS 16976-6:2014, Respiratory protective devices — Human factors — Part 6: Psycho—physiological

effects

ISO/TS 16976-7:2013, Respiratory protective devices — Human factors — Part 7: Hearing and speech

EN 137:2006, Respiratory protective devices — Self—contained open—circuit compressed air breathing

apparatus with full face mask — Requirements, testing, marking

EN 143:2018, Respiratory protective devices — Particle filters — Requirements, testing, marking

EN 144-1:2018, Respiratory protective devices — Gas cylinder valves — Part 1: Inlet connections

EN 12021:2014, Respiratory equipment — Compressed gases for breathing apparatus

EN 12941:2018, Respiratory protective devices — Powered filtering devices incorporating a loose fitting

respiratory interface — Requirements, testing, marking

EN 12942:2018, Respiratory protective devices — Powered filtering devices incorporating full face masks,

half masks or quarter masks — Requirements, testing, marking
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

NOTE Bold type used within a definition identifies term defined elsewhere in this list of preferred terms.

© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 16972:2018(E)
3.1
3.7
abrasive blasting respiratory protective aerosol penetration{ XE "aerosol
device{ XE "abrasive blasting respiratory penetration" }
protective device" } ability of particles to pass through a particle
breathing apparatus incorporating a filtering material
protective hood or a blouse fitted with an
3.8
impact resistant visor
air flow resistance{ XE "air flow resistance" }
Note 1 to entry: Breathable air is supplied to the
pressure difference between upstream and
wearer from a source of air not carried by the
downstream locations caused by the flow of air
wearer.
through parts and components of RPD such as,
an exhalation valve, inhalation valve, filter(s),
3.2
and tube, etc
accessory{ XE "accessory" }
item, or items, that are attached to the RPD that
3.9
are not necessary for the RPD to meet the
air supply hose{ XE "air supply hose" }
requirements of the ISO RPD performance
hose for supply of air at about atmospheric
standard and do not compromise its protection
pressure
3.3
3.10
adequacy assessment{ XE "adequacy
ambient air bypass{ XE "ambient air bypass"
assessment" }
selection method identifying RPD able to
means to enable the wearer to breathe the
reduce the wearers hazard exposure to
ambient atmosphere, before entering and
acceptable levels
after leaving a hazardous atmosphere
3.4
3.11
adequate RPD{ XE "adequate RPD" }
ambient air system{ XE "ambient air system"
RPD capable of reducing the inhalation
exposure to an acceptable level
device used to deliver ambient air at a low
pressure directly to breathable gas RPD
[SOURCE: ISO/TS 16975-1:2016, 3.1]
(manually or power assisted)
3.5
3.12
aerodynamic diameter{ XE "aerodynamic
ambient atmosphere{ XE "ambient
diameter" }
atmosphere" }
diameter of a unit density sphere having the
air surrounding the RPD wearer
same settling velocity as the particle in
question
3.13
ambient concentration{ XE "ambient
3.6
concentration" }
aerosol{ XE "aerosol" }
concentration of a compound in the air
suspension of solid, liquid or solid and liquid
surrounding the RPD wearer
particles in a gaseous medium, having a
negligible falling velocity (generally considered
3.14
to be less than 0,25 m/s)
ambient laboratory conditions{ XE "ambient
laboratory conditions" }
atmosphere where the temperature is between
16°C and 32°C and the relative humidity is
between 20% and 80%
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
3.15 3.21
apertometer{ XE "apertometer" } averaged minimum interactive flow rate{ XE

extended hemispherical dome for measuring "averaged minimum interactive flow rate" }

the angular area of the field of vision average of the lowest flow rate within each

(peripheral isopter) of an RPD when mounted breathing cycle of 10 consecutive breathing

on a headform cycles of the breathing machine
[SOURCE: ISO 16900-11:2013, 3.1] [SOURCE: ISO 16900-8:2015, 3.5]
3.16 3.22
as received{ XE "as received" } averaged peak interactive flow rate{ XE

not preconditioned or modified to carry out a "averaged peak interactive flow rate" }

test average of the maximum peak flow rate within
each breathing cycle of ten consecutive
[SOURCE: EN 143:2018, 3.1.1]
breathing cycles of the breathing machine
3.17
3.23
assigned protection factor
blouse{ XE "blouse" }
APF{ XE "assigned protection factor APF" }
garment, used as a facepiece, which covers the
anticipated level of respiratory protection that
head and upper part of the body to the waist
would be provided by a properly functioning
and wrists and to which air is supplied
RPD or class of RPD within an effective RPD
programme 3.24
body harness{ XE "body harness" }
[SOURCE: ISO/TS 16975-1:2016, 3.2]
means to enable a user to wear certain
components of a respiratory protective
3.18
device (RPD) on the body
assisted filtering RPD{ XE "assisted filtering
RPD" }
3.25
filtering RPD where breathable gas is actively
body temperature pressure saturated{ XE
supplied to the wearer by the RPD
"body temperature pressure saturated
BTPS" }
[SOURCE: ISO 16900-1:2014, 3.1]
BTPS
standard condition for the expression of
3.19
ventilation parameters
averaged interactive flow rate{ XE "averaged
interactive flow rate" } Note 1 to entry: Body temperature (37 °C),

interactive flow rate averaged over 10 atmospheric pressure 101,3 kPa (760 mmHg), and

water vapour pressure (6,27 kPa) in saturated air.
consecutive breathing cycles of the breathing
machine
[SOURCE: ISO 16900-13:2015, 3.2]
[SOURCE: ISO 16900-8:2015, 3.3]
3.26
breakthrough concentration{ XE
3.20
"breakthrough concentration" }
averaged maximum interactive flow rate{ XE
concentration of test gas in effluent air at which
"averaged maximum interactive flow rate" }
a gas filter undergoing a gas capacity test is
average of the highest flow rate within each
deemed exhausted
breathing cycle of 10 consecutive breathing
cycles of the breathing machine
[SOURCE: ISO 16900-8:2015, 3.4]
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
3.27 demand and provides for peak inhalation flow
breakthrough time{ XE "breakthrough time" requirements
3.35
time taken from the start of the test until the
breathing frequency{ XE "breathing
test gas and specified reaction products are
frequency" }
detected at the specified breakthrough
number of breaths taken in a minute
concentration at the downstream side of the
filter under test
Note 1 to entry: Expressed in breaths per minute.
[SOURCE: ISO 16900-4:2011, 3.3]
[SOURCE: ISO 16900-12:2016, 3.1]
3.28
3.36
breathable air{ XE "breathable air" }
breathing gas regeneration{ XE "breathing
air of a quality that makes it suitable for safe
gas regeneration" }
respiration
process whereby an RPD absorbs carbon
dioxide in exhaled gas and deliver oxygen,
Note 1 to entry: For compressed air for breathing
apparatus [EN 12021:2014]. controls water vapour and temperature of gas
to be rebreathed
3.29
breathable gas{ XE "breathable gas" } 3.37
mixtures of gases that are suitable for breathing hose (low pressure){ XE
respiration without adverse effects to health "breathing hose (low pressure)" }
flexible hose connected to the facepiece
3.30 through which breathable gas enters at

breathable gas cylinder{ XE "breathable gas atmospheric pressure or at a pressure slightly

cylinder" }
above or below
integral part of the RPD that contains the
breathable gas supply 3.38
breathing machine{ XE "breathing machine"
3.31
breathable gas quality{ XE "breathable gas
ventilation machine that simulates respiratory
quality" }
ventilation by using waveforms, which can be

composition of a breathable gas as defined in sinusoidal or representative of the inhalation

relevant standards and exhalation cycle
Note 1 to entry: See also metabolic simulator.
3.32
breath cycle{ XE "breath cycle" }
3.39
respiratory period comprising an inhalation
breathing machine assembly{ XE "breathing
and an exhalation phase
machine assembly" }
[SOURCE: ISO/TS 16976-1:2015, 3.5] breathing machine plus all connecting tubes,
control valves and other necessary hardware
3.33 leading to the trachea tube assembly
breathing apparatus{ XE "breathing
[SOURCE: ISO 16900-5:2016, 3.5]
apparatus" }
apparatus which enables the wearer to breathe
3.40
independently of the ambient atmosphere
breathing peak resistance{ XE "breathing
peak resistance" }
3.34
maximum differential pressure of an RPD
breathing bag{ XE "breathing bag" }

component of an RPD which compensates for during inhalation (inhalation peak resistance)

variations in the breathable gas supply or or exhalation (exhalation peak resistance)

© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
3.41 3.49
breathing resistance{ XE "breathing CO concentration limits{ XE "CO
2 2
resistance" }
concentration limits" }
pressure differential between upstream and
maximum allowed concentration of carbon
downstream location caused by an RPD to the
dioxide within inhaled breathable gas
flow of breathable gas during inhalation
(inhalation resistance) or exhalation
3.50
(exhalation resistance)
combined filter{ XE "combined filter" }
filter intended to remove dispersed solid
3.42
and/or liquid particles and specified gases and
breath-responsive{ XE "breath-responsive" }
vapours from the flow of air passing through it
actively or passively responsive following the
wearers demand for air
3.51
combined RPD{ XE "combined RPD" }
3.43
RPD which are capable to operate in either
bypass valve{ XE "bypass valve" }
filtering or breathable gas supply mode
component part of an RPD, which is furnished
as an emergency manual valve to supply
3.52
necessary breathable gas when the ordinary
compatibility{ XE "compatibility" }
supply path is out of order
ability of RPD to be used in conjunction with
other PPE
3.44
capacity{ XE "capacity" }
3.53
volume of available breathable gas of an RPD
competent fit-test operator{ XE "competent
fit-test operator" }
[SOURCE: ISO 16900-13:2015, 3.4]
person with suitable and sufficient experience
and with practical and theoretical knowledge of
3.45
fit-test methods that conducts the fit-testing
char length{ XE "char length" }
procedures
length of brittle residue found when a fabric or
material is exposed to thermal energy
[SOURCE: ISO 16975-3:2017, 3.3]
3.46
3.54
checking device{ XE "checking device" }
competent person{ XE "competent person" }
means to enable the wearer to verify, before
person with suitable and sufficient experience
use or periodically during use, that the
and with practical and theoretical knowledge of
manufacturer’s minimum design conditions
the elements of an RPD programme for which
are met
(s)he is responsible
3.47
[SOURCE: ISO/TS 16975-1:2016, 3.3]
class Sxxxx RPD{ XE "class Sxxxx RPD" }
supplied breathable gas RPD, where Sxxxx
3.55
equals the amount of breathable gas available
compressed air filter{ XE "compressed air
for respiration in litres
filter" }
filter intended to remove dispersed solid
[SOURCE: ISO 16900-13:2015, 3.1]
and/or liquid particles and specified gases and
vapours from compressed air passing through
3.48
cleaning/disinfection resistance{ XE
"cleaning/disinfection resistance" }
ability of the device to withstand cleaning and
disinfection processes defined by the
manufacturer
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
Note 1 to entry: These areas include the nose,
3.56
mouth, trachea, large bronchia, and the lower
compressed air line breathing apparatus{ XE
branching airways. This volume is typically 150 ml
"compressed air line breathing apparatus" }
in a male of average size.
apparatus which is not self-contained and in
which the facepiece is supplied with
[SOURCE: ISO/TS 16976-3:2011, 3.5]
breathable air from a source of compressed air
3.64
3.57
dead space{ XE "dead space:physiological" }
compressed air supply tube{ XE
‹physiological› sum of all anatomical dead
"compressed air supply tube" }
space as well as under-perfused (reduced blood
tube which delivers breathable air at a
flow) alveoli which are not participating in gas
maximum pressure of 10 bar from a source of
exchange
compressed air
Note 1 to entry: The volume of the physiological
3.58
dead space can vary with the degree of ventilation.
contaminant{ XE "contaminant" }
Thus, the physiological dead space is the fraction of
undesirable solid, liquid or gaseous substance
the tidal volume that does not participate in gas
in the air
exchange in the lungs.
3.59
[SOURCE: ISO/TS 16976-3:2011, 3.6]
confined space{ XE "confined space" }
area with limited access, as described in 3.65
national regulations, which requires special
demand type{ XE "demand type" }
considerations for entry
type of RPD which is fitted with a demand
valve governed by the breathing action of the
3.60
lungs
continuous control flow valve{ XE
"continuous control flow valve" }
3.66
control valve which provides the wearer of a
demand type with positive pressure{ XE
breathable gas-supplying RPD with "demand type with positive pressure" }

breathable gas and allows the wearer to type of RPD which is fitted with a demand

regulate a continuous air flow within valve, governed by breathing action of the
prescribed limits lungs, that actuates at a positive pressure in
the facepiece under conditions defined in
3.61
relevant standards
count median diameter
CMD{ XE "count median diameter:CMD" }
3.67
particle size of a particle distribution for
demand type without positive pressure{ XE
which one-half the total number of particles
"demand type without positive pressure" }
are larger and one-half are smaller
type of RPD which is fitted with a demand
valve, governed by breathing action of the
3.62
lungs, that actuates at a negative pressure
dead space{ XE "dead space:technical" }
during inhalation in the facepiece
‹technical› space in which exhaled gas has not
been purged and is subject to being rebreathed 3.68
demand valve{ XE "demand valve" }
3.63
valve, governed by the breathing action of
dead space{ XE "dead space:anatomical" }
lungs, supplying the breathable gas on demand
‹anatomical› conducting regions of the
pulmonary airways that do not contain alveoli
and, therefore, where no gas exchange occurs
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
3.69 3.78
desorption{ XE "desorption" } elastance{ XE "elastance E" }
process in which one substance (the filter E
medium) releases an absorbed or adsorbed pressure change resulting from a volume
substance change
Note 1 to entry: Expressed in kPa/l.
[SOURCE: ISO 16900-4:2011, 3.2]
[SOURCE: ISO 16900-12:2016, 3.2]
3.70
dew point{ XE "dew point" }
3.79
temperature of air at a specified pressure below
end-of-service-life indicator
which condensation will occur
ESLI{ XE "end-of-service-life indicator: ESLI"
3.71
system that warns the gas filtering RPD
doffing{ XE "doffing" }
wearer of the approach of the end of
process of removing or taking off the RPD
respiratory protection
3.72
3.80
donning{ XE "donning" }
escape RPD{ XE "escape RPD" }
process of putting on the RPD
RPD designed to be used only during escape
3.73 from hazardous atmospheres
downstream valve{ XE "downstream valve" }
3.81
valve which opens with the pressure of the air
exhalation valve{ XE "exhalation valve" }
and is normally kept shut by means of a spring
non-return valve which allows the release of
3.74 exhaled and excess breathable gas from the
drip{ XE "drip" } RPD
to run or fall in drops or blobs
3.82
3.75 exhaled air{ XE "exhaled air" }
dust{ XE "dust" } air breathed out by the wearer
general term denoting finely distributed solid
3.83
particles
exposed parts{ XE "exposed parts" }

Note 1 to entry: See also fume and smoke those that can be touched by the exposed

surface identification probe specified in
3.76
ISO 16900-5 as worn
dynamic breathing resistance{ XE "dynamic
breathing resistance" }
3.84
differential pressure caused by an RPD when
face blank{ XE "face blank" }
the breathing gas is delivered by a breathing
main body of a facepiece to which the
machine adjusted to a specified breathing
functional components are attached
minute volume and waveform
3.85
[SOURCE: ISO 16900-2:2017, 3.2]
facepiece{ XE "facepiece" }
part of a RPD which connects the wearers
3.77
respiratory tract to the other parts of the device
dynamic test{ XE "dynamic test" }
and isolates the respiratory tract from ambient
where the specimen is moving over the flame
atmosphere
for the exposure
Note 1 to entry: Facepieces may be full face
[SOURCE: ISO 16900-10:2015, 3.2] masks, half masks, quarter masks, mouthpiece
assemblies, filtering facepieces.
© ISO 2018 – All rights reserved
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oSIST prEN ISO 16972:2018
ISO/DIS 16972:2018(E)
Note 2 to entry: Helmets, hoods, blouses and
3.94
suits may serve the same purpose.
filter self rescuer{ XE "filter self rescuer" }
RPD exclusively intended for escape,
3.86
incorporating a filter against carbon monoxide
face-seal leakage{ XE "face-seal leakage" }
through which the ambient air is drawn to a
leakage between the wearers face and the
facepiece
respiratory interface
3.95
[SOURCE: ISO 16975-3:2017, 3.1]
fit test{ XE "fit test" }
use of a specific protocol to qualitatively or
3.87
quantitatively determine an individual’s ability
field of vision{ XE "field of vision" }
to obtain an adequate seal with a specific make,
area of fixed sight while wearing a RPD
model, and size of a tight fitting RI
3.88
use of a challenge agent and specific protocol to
filter{ XE "filter" }
qualitatively or quantitatively determine the
device intended to remove specific
effectiveness of the seal between the wearers
contaminants from the ambi
...

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