SIST EN 12941:2024
(Main)Respiratory protective devices - Powered filtering devices incorporating a loose fitting respiratory interface - Requirements, testing, marking
Respiratory protective devices - Powered filtering devices incorporating a loose fitting respiratory interface - Requirements, testing, marking
This document specifies minimum requirements for powered filtering Respiratory Protective Devices (RPD) incorporating a loose fitting respiratory interface (RI). It does not cover devices designed for use in circumstances where there is or might be an oxygen deficiency.
Escape RPD and filters for use against CO are not covered by this document.
Laboratory and practical performance tests are included for the assessment of compliance with the requirements.
Atemschutzgeräte - Gebläsefiltergeräte mit einem Atemanschluss ohne Dichtsitz (Haube) - Anforderungen, Prüfung, Kennzeichnung
Dieses Dokument legt Mindestanforderungen für Atemschutzgeräte (ASG) mit Gebläsefiltergerät und Atemanschluss ohne Dichtsitz fest. Es ist nicht anwendbar für Geräte, die für die Verwendung bei möglichem Sauerstoff Mangel vorgesehen sind.
Fluchtgeräte (ASG zu Fluchtzwecken) und Filter zur Verwendung gegen CO werden von diesem Dokument nicht abgedeckt.
Laborprüfungen und praktische Leistungsprüfungen sind enthalten, um die Übereinstimmung mit den Anforderungen feststellen zu können.
Appareils de protection respiratoire - Appareils filtrants à ventilation assistée avec interface respiratoire à ajustement lâche - Exigences, essais, marquage
Le présent document spécifie les caractéristiques minimales exigées des appareils de protection respiratoire (APR) filtrants à assistance motorisée avec interface respiratoire (IR) à ajustement lâche. Il ne s'applique pas aux appareils destinés à être utilisés dans des circonstances présentant ou pouvant présenter un défaut d'oxygène.
Les APR d'évacuation et les filtres pour utilisation contre le CO ne sont pas couverts par le présent document.
Il comporte des essais en laboratoire et des essais pratiques de performance pour évaluer la conformité aux exigences.
Oprema za varovanje dihal - Napajana oprema za filtriranje z vgrajenim ohlapno prilegajočim dihalnim vmesnikom - Zahteve, preskušanje, označevanje
Dokument določa minimalne zahteve za napajano opremo za filtriranje z vgrajenim ohlapno prilegajočim dihalnim vmesnikom. Ne zajema naprav, ki so zasnovane za uporabo v okoliščinah, kjer obstaja ali se lahko pojavi pomanjkanje kisika (koncentracija kisika, manjša od deleža prostornine 17 %).
Ta dokument ne zajema opreme za varovanje dihal za izhod v sili.
Vključeni so tudi laboratorijski in praktični preskusi za ocenjevanje skladnosti z zahtevami.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2024
Nadomešča:
SIST EN 12941:1999
SIST EN 12941:1999/A1:2004
SIST EN 12941:1999/A2:2009
Oprema za varovanje dihal - Napajana oprema za filtriranje z vgrajenim ohlapno
prilegajočim dihalnim vmesnikom - Zahteve, preskušanje, označevanje
Respiratory protective devices - Powered filtering devices incorporating a loose fitting
respiratory interface - Requirements, testing, marking
Atemschutzgeräte - Gebläsefiltergeräte mit einem Atemanschluss ohne Dichtsitz
(Haube) - Anforderungen, Prüfung, Kennzeichnung
Appareils de protection respiratoire - Appareils filtrants à ventilation assistée avec
interface respiratoire à ajustement lâche - Exigences, essais, marquage
Ta slovenski standard je istoveten z: EN 12941:2023
ICS:
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12941
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 13.340.30 Supersedes EN 12941:1998
English Version
Respiratory protective devices - Powered filtering devices
incorporating a loose fitting respiratory interface -
Requirements, testing, marking
Appareils de protection respiratoire - Appareils Atemschutzgeräte - Gebläsefiltergeräte mit einem
filtrants à ventilation assistée avec interface Atemanschluss ohne Dichtsitz (Haube) -
respiratoire à ajustement lâche - Exigences, essais, Anforderungen, Prüfung, Kennzeichnung
marquage
This European Standard was approved by CEN on 9 August 2021.
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12941:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions, description and symbols . 5
3.1 Terms and definitions . 5
3.2 Description . 6
3.3 Symbols . 7
4 Classification . 7
5 Requirements . 8
5.1 General . 8
5.2 Values and tolerances . 10
5.3 Ergonomics . 10
5.4 Design . 10
5.5 Materials . 10
5.6 Mechanical strength (optional) . 10
5.7 Resistance to temperature . 10
5.8 Respiratory Interface (RI) . 11
5.9 Inward leakage . 11
5.10 Breathing resistance . 12
5.11 Air supply . 12
5.12 Warning facilities . 12
5.13 Electrical components . 13
5.14 Breathing hose, if applicable, and couplings . 13
5.15 Filters . 14
5.16 Noise level . 19
5.17 Carbon dioxide content of the inhalation air . 20
5.18 Flammability . 20
5.19 Exhalation means, if applicable . 20
5.20 Mass of RPD . 21
5.21 Practical performance . 21
6 Testing . 22
6.1 Test schedule . 22
6.2 Conditioning . 24
6.3 Inspection . 24
6.4 Inward leakage . 25
6.5 Visor robustness . 26
6.6 Breathing resistance . 26
6.7 Air supply flow rate . 26
6.8 Resistance to collapse of breathing hose . 29
6.9 Strength of hose and couplings . 30
6.10 Mechanical strength . 30
6.11 Filter performance testing . 31
6.12 Mass carried by the head . 34
7 Marking . 35
7.1 General . 35
7.2 RI . 35
7.3 Blower-unit and battery casing (if separate from the blower-unit) . 35
7.4 Filters . 35
7.5 Filter package . 37
7.6 RPD packages . 37
8 Information supplied by the manufacturer . 37
8.1 Complete RPD . 37
8.2 Filters . 38
Annex ZA (informative) Relationship between this European Standard and the essential
health and safety requirements of Regulation 2016/425/EU [2016 OJ L81] aimed to
be covered . 39
Bibliography . 41
European foreword
This document (EN 12941:2023) has been prepared by 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 June 2024 and conflicting national standards shall be
withdrawn at the latest by June 2024.
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 12941:1998.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
The following main technical changes have been made compared to EN 12941:1998:
a) Clause 4 Designation was deleted;
b) number of test samples was added to the requirements, where necessary;
c) classification table was amended to cover Hg and NO filter for all classes (TH1, TH2 and TH3);
d) nominal values and tolerances were added;
e) clogging was deleted;
f) warning facilities were amended to cover low energy and low flow warning;
g) visual inspection was changed to inspection and detailed list inserted;
h) test substances and number of test subjects for inward leakage test was changed;
i) requirement for field of vision integrated into the requirements for visor (5.8.3);
j) test for noise level was adapted to the test procedure specified in ISO 16900-14:2020;
k) Annex A was deleted;
l) Annex B was deleted;
m) figures were adapted to the changes made in the test procedures, where appropriate.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the United
Kingdom.
1 Scope
This document specifies minimum requirements for powered filtering Respiratory Protective Devices
(RPD) incorporating a loose fitting respiratory interface (RI). It does not cover devices designed for use
in circumstances where there is or might be an oxygen deficiency.
Escape RPD and filters for use against CO are not covered by this document.
Laboratory and practical performance tests are included for the assessment of compliance with the
requirements.
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.
EN 148-1:2018, Respiratory protective devices — Threads for facepieces — Part 1: Standard thread
connection
EN 148-2:1999, Respiratory protective devices — Threads for facepieces — Part 2: Centre thread
connection
EN 148-3:1999, Respiratory protective devices — Threads for facepieces — Part 3: Thread
connection M 45 × 3
EN 13274-1:2001, Respiratory protective devices — Methods of test — Part 1: Determination of inward
leakage and total inward leakage
EN 13274-2:2019, Respiratory protective devices — Methods of test — Part 2: Practical performance tests
EN 13274-4:2020, Respiratory protective devices — Methods of test — Part 4: Flame test
EN 13274-7:2019, Respiratory protective devices — Methods of test — Part 7: Determination of particle
filter penetration
EN ISO 16972:2020, Respiratory protective devices — Vocabulary and graphical symbols (ISO 16972:2020)
ISO 16900-11:2013, Respiratory protective devices — Methods of test and test equipment — Part 11:
Determination of field of vision
ISO 16900-14:2020, Respiratory protective devices — Methods of test and test equipment — Part 14:
Measurement of sound pressure level
3 Terms and definitions, description and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 16972:2020 and the
following apply.
ISO and IEC maintain terminology 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/
3.1.1
as received
not pre-conditioned or modified to carry out a test
[SOURCE: EN ISO 16972:2020, definition 3.16]
3.1.2
ready for assembly state
component with seals, plugs or other environmental protective means, if applicable, still in place
[SOURCE: EN ISO 16972:2020, definition 3.195]
3.1.3
Respiratory Interface
(RI)
part of a respiratory protective device (RPD) that forms the protective barrier between the wearer's
respiratory tract and the ambient atmosphere
Note 1 to entry: The RI is connected to the filtering part of the RPD or the part managing the supply of breathable
gas.
[SOURCE: EN ISO 16972:2020, definition 3.202]
3.1.4
loose-fitting respiratory interface
RI that does not rely on forming a complete seal to the wearer’s skin
[SOURCE: EN ISO 16972:2020, definition 3.132]
3.1.5
powered filtering RPD
filtering RPD in which air is moved through the filter(s) by means of a blower to supply the wearer with
breathable air
[SOURCE: EN ISO 16972:2020, definition 3.180]
3.1.6
unencapsulated filter
filter that in itself is not contained in a rigid housing
[SOURCE: EN ISO 16972:2020, definition 3.247]
3.2 Description
The device typically consists of:
— a loose-fitting respiratory interface, e.g. hood, blouse or suit which can be combined with other types
of PPE;
— a blower unit with an energy supply intended to be carried/worn by the wearer which supplies
filtered ambient air to the respiratory interface;
The energy supply for the blower unit may or may not be carried on the person.
— a filter or filters through which all air supplied passes.
3.3 Symbols
3.3.1 See information supplied by the RPD manufacturer
3.3.2 Crossed out 2: Symbol “for single shift use only”
During one shift multiple use is allowed.
3.3.3 hour glass “end of shelf life”
YYYY-MM
Key: YYYY = year, MM = month
3.3.4 maximum time of use of Hg filters
3.3.5 temperature range of storage conditions
Key: -xx °C to +yy °C
3.3.6 maximum humidity of storage conditions
Key: < xx %
4 Classification
The complete devices are classified and designated according to the maximum inward leakage and
maximum particle filter penetration as given in Table 1 and strength of hoses and couplings as given in
Table 2.
Table 1 — Classification
Maximum particle
Classification of complete device
Maximum
filter penetration
inward
leakage NaCl Paraffin oil
Gas filter type
aerosol mist
Particle filter, a
(TIL or IL)
Class and class
(if applicable)
(if applicable) %
%
A1, A2 or A3
B1, B2 or B3
E1, E2 or E3
P 10 10
K1, K2 or K3
TH1 10
AX
SX
Hg P
0,2 0,2
NO P
A1, A2 or A3
B1, B2 or B3
E1, E2 or E3
P 2 2
K1, K2 or K3
TH2 2
AX
SX
Hg P
0,2 0,2
NO P
A1, A2 or A3
B1, B2 or B3
E1, E2 or E3
P
K1, K2 or K3
TH3 0,2 0,2 0,2
AX
SX
Hg P
NO P
EXAMPLE TH2A2P: An powered filtering device incorporating a loose-fitting RI (TH) fitted with a
combined gas filter and a particle filter (A2P) and where the inward leakage of the
complete device is 2 % or less.
a
TIL for combined and particle filter systems only. IL for gas filter systems.
Check in accordance with 6.3.
5 Requirements
5.1 General
All test samples specified in the related test clauses shall meet the relevant requirements.
Where it is required in a specific clause the manufacturer shall declare that a risk assessment, e.g. a
Failure Modes and Effect Analysis (FMEA) concerning these specific requirements has been conducted.
NOTE Further information is given in EN IEC 60812 [1].
If the manufacturer claims that the RPD may be used in potentially explosive atmospheres it shall comply
with the appropriate requirements.
If the RPD is intended to provide additional protection, e.g. head protection, eye protection, face
protection, or including protective clothing, it shall additionally comply with the relevant requirements
of the standards covering those related PPE.
Check in accordance with 6.3.
It shall not be possible to connect any part of the RPD to a thread conforming to EN 148-2:1999 or
EN 148-3:1999.
Check in accordance with 6.3.
When the RPD manufacturer states that an accessory is intended for use with the RPD, the RPD including
the accessory shall be tested.
Check in accordance with 6.3 and test in accordance with the appropriate test method.
The air flow rate at conditions which result in the minimum flow rate or the maximum flow rate of the
RPD shall be determined.
Depending on the design of the RPD these air flow rates can be influenced by:
— possible flow settings of the RPD,
— service life,
— the charging status of the battery,
— different filter types,
— alarm settings,
— use of accessories,
— hose length, and
— other factors, if applicable.
All results of measured air flow rates are deemed to be volumetric flow rates and shall be corrected to
20 °C, 1013 hPa according to Formula (1).
P
m
Q =Qk·· (1)
cor m
T
m
where
Q is the corrected air flow;
cor
Q is the measured air flow;
m
k is a constant 0,289 [K/hPa], i.e. 293 K divided by 1 013 hPa (20 °C);
P is the pressure during measurement, in hPa;
m
T is the temperature during measurement, in K.
m
5.2 Values and tolerances
Temperature limits, values which describe test conditions and that are not stated as maxima or minima
shall be subject to a tolerance of ± 5 %. Unless otherwise specified, the ambient conditions for testing
shall be between 16 °C and 32 °C and (50 ± 30) % relative humidity.
Any temperature limits specified shall be subject to an accuracy of ± 1 °C.
5.3 Ergonomics
The requirements of this document are intended to take account of the interaction between the wearer,
the RPD, and where possible the working environment in which the RPD is likely to be used. The RPD
shall satisfy 5.5, 5.11 and 5.12.
Testing shall be performed in accordance with EN 13274-2:2019.
5.4 Design
The finish of any part of the device likely to come in contact with the wearer shall be free from sharp
edges and burrs.
Check in accordance with 6.3 and test in accordance with EN 13274-2:2019.
5.5 Materials
5.5.1 General
Materials used shall be suitable to withstand the intended use and conditions, (e.g. temperatures,
humidity and corrosive environments) as stated by the manufacturer unless otherwise specified in this
document.
The manufacturer shall supply a declaration that this was addressed by a risk assessment, e.g. a FMEA.
Check in accordance with 6.3.
5.5.2 Skin compatibility
Materials that may come into direct contact with the wearer's skin or that may affect the quality of the
breathing air shall not be known to be likely to cause skin irritation or any other adverse effects to health.
The manufacturer shall supply a declaration that this was addressed by a risk assessment, e.g. a FMEA.
Check in accordance with 6.3.
5.6 Mechanical strength (optional)
After conditioning in accordance with 6.2.1, blower units and battery casings (if separate from the blower
unit) shall show no significant deformation of major components, nor shall these components separate
from each other.
The requirements of 5.7, 5.9 to 5.14 and 5.16 to 5.21 shall be met and the RPD shall be marked in
accordance with 7.3 d).
5.7 Resistance to temperature
After conditioning at the extremes of temperature and humidity in accordance with 6.2.2, the RPD
components including filters in their ready for assembly state shall show no significant deformation of
major components, nor shall these components separate from each other or from the complete RPD.
The requirements of 5.8 to 5.14 and 5.16 to 5.21 shall be met.
5.8 Respiratory Interface (RI)
5.8.1 General
When the RI does not include an integral blower unit it shall not be possible to fit the filter(s) directly to
the RI or the breathing hose (if applicable).
RI shall not be equipped with a standard thread connection according to EN 148-1:2018.
5.8.2 Head harness
The head harness (if fitted) of a RI shall be capable of being adjusted to fit a range of head sizes.
Check in accordance with 6.3 and test in accordance with 6.4 and EN 13274-2:2019.
5.8.3 Visor
5.8.3.1 One sample shall be preconditioned in accordance with 6.2.2.
5.8.3.2 Visors shall not distort vision nor shall any misting occur which significantly affects vision as
determined in the course of testing.
Where anti-misting compounds are used or specified by the manufacturer, they shall be compatible with
eyes, skin and the device under the foreseeable conditions of use.
Testing shall be performed in accordance with 6.4 and EN 13274-2:2019.
5.8.3.3 The sample shall be fitted three times and shall have an average visual field score (VFS) of at
least 98. Six out of 8 dots of the section between 20° and 30°; 340° and 350°, 150° and 160° and 190° and
200° in the modified VFS scale shall be within the number counted.
In addition, at least two of the four critical dots which lie in the section between 20° and 30°; 340° and
350°, 150° and 160° and 190° and 200° shall be included in the field score.
This requirement shall not apply if means of protection against non-ionizing radiation (e.g. welding) is
an integral part of the RPD covered by this document.
Testing shall be performed in the power-on mode in accordance with ISO 16900-11:2013 without
corrective eyewear.
5.8.3.4 One sample shall be fitted to a test subject.
In this case a sign consisting of letters 100 mm in height, black on white and with a thickness of 20 mm
at a distance of 6 m shall be readable.
This requirement shall not apply if means of protection against non-ionizing radiation (e.g. welding) is
an integral part of the RPD covered by this document.
Testing shall be performed in accordance with EN 13274-2:2019.
5.8.3.5 After being tested in accordance with 6.5 the sample shall comply with 5.9.
5.9 Inward leakage
Two samples, or more if disposable, shall be temperature conditioned in accordance with 6.2.2 and, if
applicable, mechanical strength conditioned in accordance with 6.2.1.
When tested at the manufacturer’s minimum flowrate, the inward leakage of the test substance for each
of the exercises shall not exceed the levels given in the appropriate class in Table 1.
If the RPD is for
— particles only, the inward leakage test shall be performed with ten subjects using NaCl aerosol;
— gases only, the inward leakage test shall be performed with ten test subjects using SF
6;
— particles and gases, the inward leakage test shall be performed with five test subjects, using SF and
five subjects using NaCl aerosol. See Table 7.
Testing shall be performed in accordance with 6.4.
5.10 Breathing resistance
One sample shall be temperature preconditioned in accordance with 6.2.2 and, if applicable, mechanical
preconditioned in accordance with 6.2.1.
The exhalation resistance shall not exceed 5 mbar.
Testing shall be performed in accordance with 6.6.
5.11 Air supply
One sample shall be temperature preconditioned in accordance with 6.2.2 and, if applicable, mechanical
preconditioned in accordance with 6.2.1.
When mounted on a test head or torso the flow into the RI shall be not less than the manufacturer's
minimum flow rate for the manufacturer's stated design duration.
The measured minimum flow rate shall be determined and check to be if it is equal to or greater than the
specified manufacturer’s minimum flowrate in accordance with 6.7.
The minimum and maximum values shall be determined in time intervals between the initial starting of
the device and at least 5 min after the activation of the low energy warning.
Testing shall be performed in accordance with 6.7.
The flow rate and distribution of the air under the RI shall not cause distress to the wearer (for example
by excessive local cooling of the head and face or by causing eye irritation).
It shall not be possible to switch off the air supply inadvertently.
Testing shall be performed in accordance with EN 13274-2:2019.
If a means is provided to adjust the air supply to give a RPD classification then it shall not be possible to
change the classification during use. The RPD shall be so designed that it is not possible to inadvertently
change the air flow.
A means for adjusting the air flow during use within a classification can be provided.
Check in accordance with 6.3 and test in accordance with EN 13274-2:2019.
5.12 Warning facilities
5.12.1 General
Two samples shall be temperature preconditioned in accordance with 6.2.2 and, if applicable, mechanical
preconditioned in accordance with 6.2.1.
All warnings shall draw the attention of the wearer within 15 s once activated at or above the
manufacturer’s minimum flow rate.
All warnings, except for low energy, shall continue to function while the cause of the warning remains.
After activation of the warning, it shall not be possible to turn off the warning device by the wearer while
the cause of the alarm remains.
Test in accordance with EN 13274-2:2019.
5.12.2 Low energy warning
All classes of the RPD shall be equipped with at least one low energy warning facility. Information about
the remaining service time to leave the hazardous environment, which shall be at least 5 min, shall be
given in the information supplied by the manufacturer.
Check in accordance with 6.3 and test in accordance with 6.7.6 and EN 13274-2:2019.
5.12.3 Low flow warning
All classes of the RPD shall be equipped with at least one low flow warning facility.
Check in accordance with 6.3 and test in accordance with 6.7.7 and EN 13274-2:2019.
5.13 Electrical components
One sample as received shall be checked.
Electrical components shall be so designed that it is not possible to inadvertently reduce or reverse the
air flow.
Check in accordance with 6.3 and EN 13274-2:2019.
If the device is claimed to be intrinsically safe for use in potentially explosive atmospheres it shall comply
with the appropriate requirements.
5.14 Breathing hose, if applicable, and couplings
5.14.1 General
Two samples shall be temperature preconditioned in accordance with 6.2.2.
Any breathing hose shall permit free head movement without danger of being caught up, as assessed by
the test subjects.
Testing shall be performed in accordance with EN 13274-2:2019.
The air flow when the load is applied shall not be reduced by more than 50 % of the manufacturer's
minimum flow rate.
There shall be no deformation 5 min after completion of the test.
Testing shall be performed in accordance with 6.8.
Table 2 — Strength of hose and couplings
Strength
Classification
N
TH1 (50 ± 2,5)
TH2 (100 ± 5)
TH3 (250 ± 10)
5.14.2 Strength of coupling to RI
Hoses and couplings shall meet the requirements given in Table 2 and shall not become disconnected or
visibly damaged. Where multiple hoses are fitted to the device each hose shall meet the requirements
given in Table 2. Each connection shall withstand the force as defined by its classification.
Testing shall be performed in accordance with 6.9.
5.15 Filters
5.15.1 Particle filters - Classification and designation
Powered particle filtering RPD shall be classified according to their maximum particle filter penetration
given in Table 1.
Powered particle filtering RPD can be classified at three levels and shall be designated as follows:
THyP
where
y is the inward leakage class 1, 2 or 3.
5.15.2 Gas filters
5.15.2.1 Classification and designation
Powered gas filtering RPD shall be classified according to their application and protection capacity and
shall be designated as follows:
THy Gas z
where
y is the inward leakage class 1, 2 or 3; and
z is the capacity of the gas filter 1, 2 or 3; and
'Gas' means one or more of the types listed in (5.15.2.2.2), (5.15.2.2.3) or (5.15.2.2.4).
5.15.2.2 Types of filters
5.15.2.2.1 General
Gas filters are classified in following types or combinations of them. If a filter is a combination of types, it
shall meet the requirements of each type separately.
5.15.2.2.2 Types A, B, E and K
a) Type A
For use against certain organic gases and vapours of organic substances with a boiling point higher
than 65 °C as specified by the manufacturer.
b) Type B
For use against certain inorganic gases and vapours as specified by the manufacturer (excluding
carbon monoxide).
c) Type E
For use against sulfur dioxide and other acidic gases and vapours as specified by the manufacturer.
d) Type K
For use against ammonia and organic ammonia derivatives as specified by the manufacturer.
5.15.2.2.3 Special filters
Special filters shall include a particle filter on the inlet side.
a) Type NO P
For use against oxides of nitrogen, e.g. NO, NO , NO .
2 x
Type NO P filters are for single shift use only up to the intended use time specified by the
manufacturer and shall be marked with the symbol given in 3.3.2.
b) Type Hg P
For use against mercury.
All HgP filters are for a maximum cumulated use time of 50 h and shall be marked with the symbol
given in 3.3.4.
5.15.2.2.4 AX and SX filters
a) Type AX
For use against certain organic gases and vapours with a boiling point ≤ 65 °C as specified by the
manufacturer.
Type AX filters are for single shift use only and shall be marked with the symbol given in 3.3.2.
b) Type SX
For use against specific named gases and vapours as specified by the manufacturer.
5.15.2.3 Classes of filters — Types A, B, E, and K
Type A, B, E and K filters are classified as follows:
— Class 1: Low capacity;
— Class 2: Medium capacity;
— Class 3: High capacity.
Special filter shall only be specified for one class.
5.15.2.4 Combined filters
Combined filters shall be classified as separate entities in accordance with 5.15.1.1 and 5.15.2.1 and shall
be designated as follows:
THy Gas z P
where
y is 1, 2 or 3;
z is 1, 2 or 3; and
Gas means one or more of the types listed in (5.15.2.2.2), (5.15.2.2.3) or (5.15.2.2.4).
5.15.3 Filter requirements
5.15.3.1 General
The connection between filter(s) and the mating part of the device shall be robust and leaktight.
The connection between the filter and the mating part may be achieved by a special type of a connection,
a thread conforming to EN 148-1:2018 or other screw threads.
Filters other than pre-filters shall be designed to be irreversible and shall be easily replaceable without
use of special tools.
Filters in their ready for assembly state shall be subjected to temperature conditioning as specified in 5.7
followed by the mechanical strength for filter as specified in 5.15.3.3.
For particle filter efficiency three filters for each test aerosol shall be tested in accordance with 6.11.2.
For gas capacity three filters for each test gas shall be tested in accordance with 6.11.3.
The particle filter of a combination filter shall be on the influent side of the filter.
Check in accordance with 6.3 and test in accordance with 6.4 and 6.11.
5.15.3.2 Materials
The inside of the filter shall be resistant to corrosion by the filter media.
Material from the filter media released by the air flow through the filter shall not pose a hazard or an
adverse effect for the wearer.
The manufacturer shall supply a declaration that both requirements were addressed by a risk
assessment, e.g. a FMEA.
Check in accordance with 6.3.
5.15.3.3 Mechanical strength - Filter
After conditioning in accordance with 6.2.2 filters shall be tested in accordance with 6.10 with a total
number of 2 000 rotations and shall then meet the requirements specified in 5.15.3.4 as appropriate.
5.15.3.4 Protection efficiency/capacity
5.15.3.4.1 Particle filters
Three samples for each aerosol shall be temperature preconditioned in accordance with 6.2.2.
Particle filters shall comply with the requirements given in Table 1.
Testing shall be performed in accordance with 6.11.1 and 6.11.2.
5.15.3.4.2 Gas filters type A, B, E and K and combined filters
Three samples for each aerosol shall be temperature preconditioned in accordance with 6.2.2.
Gas filters shall comply with the requirements given in Table 3.
Testing shall be performed in accordance with 6.11.1, 6.11.3.1 and 6.11.3.2.
When such a gas filter is combined with a particle filter, the combined filter shall, in addition to the
requirements of Table 3, comply with the requirement for the particle filter given in Table 1.
5.15.3.4.3 Special filters
Special filters shall comply with the requirements given in Table 4 and with the requirement for the
particle filter given in Table 1.
Testing shall be performed in accordance with 6.11.1, 6.11.3.1 and 6.11.3.3.
Special filter shall only be specified for one class.
5.15.3.4.4 AX filters
AX filters shall comply with the requirements given in Table 5 and, if applicable, with the requirement for
the particle filter given in Table 1.
Testing shall be performed in accordance with 6.11.1, 6.11.3.1 and 6.11.3.4.
5.15.3.4.5 SX filters
5.15.3.4.5.1 Sorption
SX filters shall have a breakthrough time of not less than 20 min.
The minimum breakthrough time is intended only for laboratory tests under standardized conditions.
They do not give an indication of the possible service time of the filter in practical use. Possible service
times can differ from the breakthrough times determined according to this document in both directions,
positive and negative, depending on the conditions of use.
Testing shall be performed in accordance with 6.11.1, 6.11.3.1 and 6.11.3.5.1.
5.15.3.4.5.2 Desorption
The effluent concentration from SX filters shall not be less than 5 ml/m of the test gas at any time during
the test.
Testing shall be performed in accordance with 6.11.1, 6.11.3.1 and 6.11.3.5.2.
When such a gas filter is combined with a particle filter, the combined filter shall, in addition to the
requirements of 5.15.3.4.5.1 and the requirements of this subclause, comply with the requirement for the
particle filter given in Table 1.
5.15.3.5 Multiple filters
Where the RPD employs multiple filters through which the flow is proportioned, the flow through the
filters shall be balanced. The flow through multiple filters is considered to be balanced if the filter
resistance conforms to Formula (2):
∆ max
fr
≤ 02, (2)
mfr
where
is the maximum difference in the flow resistance;
∆ max
fr
mfr
is the mean flow resistance.
To assess this balance, the resistance of the filters shall be measured at a flow rate which is given by the
manufacturer's minimum flow rate divided by the number of filters through which the air flow is
proportioned.
Table 3 — Protection capacity of gas filters of types A, B, E and K
Minimum breakthrough time
Filter type and
at test condition
Test gas
class
min
A 1 Cyclohexane (C H ) 70
6 12
Chlorine (Cl2) 20
B 1 Hydrogen sulfide (H S) 40
Hydrogen cyanide (HCN) 25
E 1 Sulfur dioxide (SO ) 20
K 1 Ammonia (NH ) 50
A 2 Cyclohexane (C H ) 70
6 12
Chlorine (Cl ) 20
B 2 Hydrogen sulfide (H S) 40
Hydrogen cyanide (HCN) 25
E 2 Sulfur dioxide (SO ) 20
K 2 Ammonia (NH ) 50
A 3 Cyclohexane (C H ) 35
6 12
Chlorine (Cl ) 20
B 3 Hydrogen sulfide (H S) 40
Hydrogen cyanide (HCN) 25
E 3 Sulfur dioxide (SO ) 20
K 3 Ammonia (NH ) 40
NOTE The minimum breakthrough times are intended only for laboratory tests under
standardized conditions. They do not give an indication of the possible service time of the filter in
practical use which can differ from the breakthrough times in both directions, positive and negative
depending on the conditions of use.
Table 4 — Protection capacity of special filters
Minimum breakthrough
Filter type Test gas
time at test condition
Nitric oxide (NO)
NO P 20 min
Nitrogen dioxide (NO )
Hg P Mercury vapour (Hg) 100 h
NOTE 1 Special filter are only specified for one class.
NOTE 2 The minimum breakthrough times are intended only for laboratory
tests under standardized conditions. They do not give an indication of the
possible service time of the filter in practical use which can differ from the
breakthrough times in both directions, positive and negative depending on the
conditions of use.
Table 5 — Protection capacity of AX filters
Minimum breakthrough time
at test condition
Test gas
min
Dimethyl ether (CH -O-CH )
3 3
Isobutane (C H )
4 10
NOTE 1 AX filter are only specified for one class.
NOTE 2 The minimum breakthrough times are intended only for laboratory
tests under standardized conditions. They do not give an indication of the
possible service time of the filter in practical use which can differ from the
breakthrough times in both directions, positive and negative depending on the
conditions of use.
5.16 Noise level
One sample shall be temperature preconditioned in accordance with 6.2.2 and, if applicable, mechanical
stress in accordance with 5.6.
The noise generated by the RPD shall not exceed 75 dB(A) when tested in accordance with
ISO 16900-14:2020, Method A, using a test head using the dimensions given in Figure 1.
Dimensions in millimetres
Key
a is the vertical reference line -back of the head form;
b is the horizontal reference line through the centre of the eyes.
Figure 1 — Position of the microphone in test head form
5.17 Carbon dioxide content of the inhalation air
One sample shall be temperature preconditioned in accordance with 6.2.2 and, if applicable, mechanical
stress in accordance with 5.6.
The RPD shall be measured three times. For each measurement the RI shall be re-fitted to the head form.
Measurements shall be taken when a steady value has been obtained.
The RPD is fitted to a head form/torso and operated at the minimum flow rate. Breathing air is supplied
at a specified rate
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