EN 352-3:2020

Hearing protectors - General requirements - Part 3: Earmuffs attached to head protection and/or face protection devices

This document specifies requirements for construction, design, performance, marking and user information for earmuffs attached to head protection and/or face protection devices, hereinafter referred to as ‘mounted earmuffs’.
In particular, it specifies requirements regarding the sound attenuation of mounted earmuffs, measured in accordance with EN ISO 4869-1:2018.
The document does not apply to earmuffs outside the size range of headsizes as defined in this standard.
Because one model of earmuffs designed to be attached to head protection and/or face protection devices can be fitted to a number of other models and sizes of the carrier, this part of the standard sets out a series of physical and acoustic requirements for earmuffs when fitted to the specified model(s) or size(s) of head protection and/or face protection device.
All requirements apply to earmuffs fitted to one of the specified models or sizes of head protection and/or face protection device (the basic combination). An abbreviated set of requirements applies to the same model of earmuffs when fitted to the other specified models or sizes of head protection and/or face protection device (the supplementary combinations).
Ergonomic aspects are addressed by taking into account, within the requirements, the interaction between the user, the device and, where possible, the working environment in which the device is likely to be used (see Annex ZA and EN 458).

Gehörschützer - Allgemeine Anforderungen - Teil 3: An Kopfschutz und/oder Gesichtsschutzgeräten befestigte Kapselgehörschützer

Dieses Dokument legt Anforderungen hinsichtlich Konstruktion, Gestaltung, Leistung, Kennzeichnung und Benutzerinformationen für an Kopfschutz und/oder Gesichtsschutz befestigte Kapselgehörschützer, im Folgenden bezeichnet als „befestigte Kapselgehörschützer“, fest.
Im Besonderen legt es Anforderungen bezüglich der Schalldämmung der befestigten Kapselgehörschützer fest, gemessen in Übereinstimmung mit EN ISO 4869 1:2018.
Dieses Dokument ist nicht anzuwenden für Kapselgehörschützer außerhalb des in dieser Norm definierten Bereichs von Kopfgrößen.
Weil ein Modell von Kapselgehörschützern zur Befestigung an Kopfschutz und/oder Gesichtsschutz an mehreren anderen Modellen und Größen der Trägervorrichtung befestigt werden kann, legt dieser Teil der Norm eine Reihe von physikalischen und akustischen Anforderungen fest, die zu erfüllen sind, wenn die Kapselgehörschützer an einem/einer oder mehreren bestimmten Modell(en) oder Größe(n) eines Kopfschutzes und/oder Gesichtsschutzes angebracht sind.
Alle Anforderungen sind anzuwenden für Kapselgehörschützer, die an einem der angegebenen Modelle oder Größen des Kopfschutzes und/oder Gesichtsschutzes befestigt werden (die Basiskombination). Ein verkürzter Satz an Anforderungen gilt für dasselbe Kapselgehörschützer-Modell, wenn es an die anderen angegebenen Modelle oder Größen des Kopfschutzes und/oder Gesichtsschutzes befestigt wird (die Zusatzkombinationen).
Ergonomische Aspekte werden innerhalb der Anforderungen durch die Einbeziehung der Wechselwirkung zwischen dem Gehörschutzbenutzer, dem Gehörschutz und, wo möglich, der Arbeitsumgebung, in dem der Gehörschutz wahrscheinlich benutzt wird, berücksichtigt (siehe Anhang ZA und EN 458).

Protecteurs individuels contre le bruit - Exigences générales - Partie 3 : Serre-tête montés sur dispositifs de protection de la tête et/ou du visage

Le présent document spécifie les exigences en matière de construction, de conception, de performances, de marquage et d'informations destinées à l'utilisateur des serre-tête montés sur des dispositifs de protection de la tête et/ou du visage, ici désignés sous l'appellation « serre-tête montés ».
Il spécifie en particulier les exigences relatives à la déclaration de l'affaiblissement acoustique des serre-tête montés, mesuré conformément à l'EN ISO 4869-1:2018.
Le présent document ne s'applique pas aux serre-tête dont la taille n'appartient pas à la gamme de tailles définie dans la présente norme.
Du fait qu'un même modèle de serre-tête conçu pour être monté sur des dispositifs de protection de la tête et/ou du visage peut être fixé sur un certain nombre de modèles ou tailles de dispositifs de protection de la tête et/ou du visage, la présente partie de la norme définit une série d'exigences physiques et acoustiques pour le serre-tête lorsqu’il est monté sur le ou les modèle(s) ou taille(s) spécifié(s) de dispositifs de protection de la tête et/ou du visage.
Les exigences s'appliquent en totalité à la combinaison de base, c'est-à-dire aux serre-tête montés sur l'un des modèles ou l'une des tailles spécifiés de dispositif de protection de la tête et/ou du visage. Elles s'appliquent en partie seulement à la/aux combinaison(s) supplémentaire(s), c'est-à-dire aux serre-tête du même modèle mais montés sur les autres modèle(s) ou taille(s) de dispositifs de protection de la tête et/ou du visage qui sont spécifiés.
Dans les exigences spécifiées, les aspects ergonomiques sont abordés par la prise en compte de l'interaction entre l'utilisateur, l'équipement et, quand cela est possible, l'environnement de travail dans lequel l'équipement est susceptible d'être utilisé (voir l'Annexe ZA et l'EN 458).

Varovala sluha - Splošne zahteve - 3. del: Naušniki, pritrjeni na varovalno opremo za zaščito glave in/ali obraza

General Information

• Status: Published
• Publication Date: 17-Nov-2020
• ICS: 13.340.20 - Head protective equipment
• Technical Committee: CEN/TC 159 - Hearing protectors
• Drafting Committee: CEN/TC 159/WG 6 - Hearing protectors - General requirements and test methods
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 18-Nov-2020
• Due Date: 29-Aug-2020
• Completion Date: 18-Nov-2020
• Directive: 2016/425 - Regulation (EU) 2016/425 of the European Parliament and of the Council of 9 March 2016 on personal protective equipment and repealing Council Directive 89/686/EEC
• Mandate: M/571 - COMMISSION IMPLEMENTING DECISION of 19.11.2020 on a standardisation request to the European Committee for Standardization and the European Committee for Electrotechnical Standardization as regards personal protective equipment in support of Regulation (EU) 2016/425 of the European Parliament and of the Council
• Mandate: M/571 AMD 1 - Personal Protective Equipement
• Ref Project: SIST EN 352-3:2021 - Hearing protectors - General requirements - Part 3: Earmuffs attached to head protection and/or face protection devices

Relations

• Replaces: EN 352-3:2002 - Hearing protectors - General requirements - Part 3: Ear-muffs attached to an industrial safety helmet
• Effective Date: 25-Nov-2020

Overview

EN 352-3:2020 - "Hearing protectors - General requirements - Part 3" is a European standard from CEN that sets requirements for earmuffs attached to head protection and/or face protection devices (commonly called mounted earmuffs). It covers construction, design, acoustic performance, marking and user information. Acoustic performance (sound attenuation) is required to be measured in accordance with EN ISO 4869-1:2018. The standard also addresses ergonomic interaction between user, device and likely working environments and aligns with PPE legislation (see Annex ZA and Regulation (EU) 2016/425).

Key Topics and Requirements

• Scope and definitions: Applies to mounted earmuffs within the head‑size ranges defined in the standard and distinguishes basic combinations (earmuff fitted to specified carrier model/size) from supplementary combinations (same earmuff fitted to other specified carriers).
• Construction & materials: Requirements for materials, cup assembly, cushions, liners and cup supporting arms to ensure secure attachment to helmets/face gear.
• Sizing & adjustability: Specifies sizing ranges (small/medium/large) and adjustability so the majority of users achieve an adequate fit.
• Mechanical performance: Tests for cup rotation, headband (equivalent) force, cushion pressure and resistance to damage (drop tests and optional low‑temperature drops).
• Acoustic performance:
  • Sound attenuation must be declared and meet minimum values when measured to EN ISO 4869-1:2018.
  • Insertion loss and objective test methods are referenced for comparative measurements; limits on variability after performance tests are specified.
  • Resistance to leakage and other acoustic integrity checks are included.
• Safety characteristics: Tests for ignitability and for changes in headband force (including optional water immersion) where applicable.
• Marking & user information: Requirements for clear marking and user instructions to support correct selection, fitting, care and maintenance.

Practical Applications & Users

EN 352-3:2020 is essential for:

• Manufacturers designing or certifying mounted earmuffs for use with safety helmets, visors, powered respirator headtops and other carriers.
• PPE procurement teams and safety managers specifying compatible hearing and head/face protection for industrial, construction, forestry, rescue and other noisy work environments.
• Test laboratories conducting acoustic and physical conformity testing against EN 352‑3 requirements.
• Regulatory bodies and conformity assessment organizations verifying compliance with PPE Regulation (EU) 2016/425.

Related Standards

• EN 352 family (EN 352‑1, ‑2, ‑4 to ‑10) - other hearing protector types and safety functions
• EN ISO 4869‑1:2018 / EN ISO 4869‑2:2018 - sound attenuation and estimation methods
• EN 13819‑1 / EN 13819‑2 - physical and acoustic test methods
• EN 458 - selection, use, care and maintenance of hearing protection

EN 352-3:2020 helps ensure mounted earmuffs deliver reliable acoustic protection, safe mechanical attachment to carriers, and clear user guidance for real-world workplace use.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2021
Nadomešča:
SIST EN 352-3:2003
Varovala sluha - Splošne zahteve - 3. del: Naušniki, pritrjeni na varovalno opremo
za zaščito glave in/ali obraza
Hearing protectors - General requirements - Part 3: Earmuffs attached to head protection
and/or face protection devices
Gehörschützer - Allgemeine Anforderungen - Teil 3: An Kopfschutz und/oder
Gesichtsschutzgeräten befestigte Kapselgehörschützer
Protecteurs individuels contre le bruit - Exigences générales - Partie 3 : Serre-tête
montés sur dispositifs de protection de la tête et/ou du visage
Ta slovenski standard je istoveten z: EN 352-3:2020
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 352-3
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 13.340.20 Supersedes EN 352-3:2002
English Version
Hearing protectors - General requirements - Part 3:
Earmuffs attached to head protection and/or face
protection devices
Protecteurs individuels contre le bruit - Exigences Gehörschützer - Allgemeine Anforderungen - Teil 3: An
générales - Partie 3 : Serre-tête montés sur dispositifs Kopfschutz und/oder Gesichtsschutzgeräten befestigte
de protection de la tête et/ou du visage Kapselgehörschützer
This European Standard was approved by CEN on 24 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 352-3:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviations . 9
4 Requirements . 9
4.1 Sizing . 9
4.2 Materials and construction . 9
4.2.1 Materials . 9
4.2.2 Construction . 10
4.3 Performance . 10
4.3.1 General . 10
4.3.2 Sizing and adjustability . 10
4.3.3 Cup rotation . 10
4.3.4 Headband force . 10
4.3.5 Cushion pressure . 11
4.3.6 Resistance to damage when dropped . 12
4.3.7 Resistance to damage when dropped at low temperature (optional) . 12
4.3.8 Change in headband force (including optional water immersion with headband
under stress) . 12
4.3.9 Insertion loss . 12
4.3.10 Resistance to leakage . 12
4.3.11 Ignitability . 12
4.3.12 Minimum sound attenuation . 13
5 Marking . 13
6 User information . 13
Annex A (informative) Technical changes between this document and the previous edition
of this European Standard . 17
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/425 aimed to be covered . 19
Bibliography . 21

European foreword
This document (EN 352-3:2020) has been prepared by Technical Committee CEN/TC 159 “Hearing
protectors”, 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 May 2021, and conflicting national standards shall be
withdrawn at the latest by November 2023.
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 352-3:2002.
The technical changes between this document and the previous edition of this European Standard are
listed in Annex A.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Regulation(s).
For relationship with EU Regulation(s), see informative Annex ZA, which is an integral part of this
document.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
Introduction
This document sets requirements for personal hearing protection devices in relation to Regulation (EU)
2016/425 on personal protective equipment.
The particular requirement in relation to the ability of hearing protectors to reduce noise below limit
levels is addressed in the standard by requiring the sound attenuation of the hearing protectors,
measured in accordance with EN ISO 4869-1, to be not less than a specified minimum. Further, by
requiring that the measured sound attenuation be declared, the selection of suitable hearing protectors
for individual circumstances can be undertaken according to established practice.
EN 352-3 is part of a family of standards describing product requirements for hearing protectors:
— EN 352-1, Hearing protectors — General requirements — Part 1: Earmuffs
— EN 352-2, Hearing protectors — General requirements — Part 2: Earplugs
— EN 352-3, Hearing protectors — General requirements — Part 3: Earmuffs attached to head
protection and/or face protection devices
— EN 352-4, Hearing protectors — Safety requirements — Part 4: Level-dependent earmuffs
— EN 352-5, Hearing protectors — Safety requirements — Part 5: Active noise reduction earmuffs
— EN 352-6, Hearing protectors — Safety requirements — Part 6: Earmuffs with safety-related audio
input
— EN 352-7, Hearing protectors — Safety requirements — Part 7: Level-dependent earplugs
— EN 352-8, Hearing protectors — Safety requirements — Part 8: Entertainment audio earmuffs
— EN 352-9, Hearing protectors — Safety requirements — Part 9: Earplugs with safety-related audio
input
— EN 352-10, Hearing protectors — Safety requirements — Part 10: Entertainment audio earplugs
Test methods for these requirements for all types of hearing protectors are described in the following
standards:
— EN 13819-1, Hearing protectors — Testing — Part 1: Physical test methods
— EN 13819-2, Hearing protectors — Testing — Part 2: Acoustic test methods
— EN 13819-3, Hearing protectors — Testing — Part 3: Supplementary acoustic test methods
An associated standard EN 458 covers selection, use, care and maintenance of hearing protection.
The parts of EN 352, other than parts 1, 2 and 3, cover the performance of functions additional to
passive hearing protection. Hearing protectors which incorporate one or more of these functions are
subject to the requirements and tests of each of the relevant parts of EN 352-4 to −10, in addition to
that of parts 1, 2 or 3, as appropriate.
The requirements of this document are concerned primarily with the physical and acoustic
performance of earmuffs attached to head protection and/or face protection devices (mounted
earmuffs).
The sizing requirements enable the majority of the user population to be fitted satisfactorily by
“medium size range” mounted earmuffs. Individuals with other sizes can be accommodated by “small
size range” or “large size range” mounted earmuffs, which are required to be accompanied by
information regarding the range of sizes which they are designed to fit.
The standard also calls for the values of sound attenuation provided by the mounted earmuffs
(measured in accordance with EN ISO 4869-1) in order to assist users in selecting the most appropriate
model of mounted earmuffs for their needs. Minimum values of sound attenuation are also specified.
A maximum variability in insertion loss, measured objectively after a series of performance tests, is
specified. The objective test method only facilitates the making of comparative measurements, and the
insertion loss values obtained will differ from the measured sound attenuation values. The method to
determine the sound attenuation values which requires the mounted earmuffs to be tested whilst being
worn by human test subjects, is regarded as providing the reference test method for the measurement
of the acoustic performance of hearing protectors.
1 Scope
This document specifies requirements for construction, design, performance, marking and user
information for earmuffs attached to head protection and/or face protection devices, hereinafter
referred to as ‘mounted earmuffs’.
In particular, it specifies requirements regarding the sound attenuation of mounted earmuffs, measured
in accordance with EN ISO 4869-1:2018.
The document does not apply to earmuffs outside the size range of headsizes as defined in this
standard.
Because one model of earmuffs designed to be attached to head protection and/or face protection
devices can be fitted to a number of other models and sizes of the carrier, this part of the standard sets
out a series of physical and acoustic requirements for earmuffs when fitted to the specified model(s) or
size(s) of head protection and/or face protection device.
All requirements apply to earmuffs fitted to one of the specified models or sizes of head protection
and/or face protection device (the basic combination). An abbreviated set of requirements applies to
the same model of earmuffs when fitted to the other specified models or sizes of head protection and/or
face protection device (the supplementary combinations).
Ergonomic aspects are addressed by taking into account, within the requirements, the interaction
between the user, the device and, where possible, the working environment in which the device is likely
to be used (see Annex ZA and EN 458).
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 13819-1:2020, Hearing protectors — Testing — Part 1: Physical test methods
EN 13819-2:2020, Hearing protectors — Testing — Part 2: Acoustic test methods
EN ISO 4869-2:2018, Acoustics — Hearing protectors — Part 2: Estimation of effective A-weighted sound
pressure levels when hearing protectors are worn (ISO 4869-2:2018)
3 Terms, definitions, symbols and abbreviations
3.1 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
3.1.1
passive hearing protection
hearing protection that provides attenuation of external sounds not by means of electronics
Note 1 to entry: All hearing protectors have the characteristics of reducing noise by their design and type of
material used. Devices that have only this function are called passive hearing protection.
[SOURCE: EN 352-1:2020, 3.1.1]
3.1.2
cup
hollow component which is mounted on the equivalent headband and to which a cushion and a liner are
usually fitted
[SOURCE: EN 352-1:2020, 3.1.2]
3.1.3
cup supporting arm
arm, usually of metal or plastics, attached to the head protection and/or face protection device shell and
designed to enable the earmuffs' cup to fit securely around the ear by exerting force against the cup and
pressure through the cushion
Note 1 to entry: It includes the means of attachment to the head protection and/or face protection device.
3.1.4
cushion
deformable component, usually containing a foam plastic or fluid filling, fitted to the rim of the cup to
improve the comfort and fit of the earmuffs on the head
[SOURCE: EN 352-1:2020, 3.1.3]
3.1.5
liner
acoustically absorptive material contained within the cup which is intended to increase the attenuation
of the earmuffs at certain frequencies
[SOURCE: EN 352-1:2020, 3.1.4]
3.1.6
earmuff
hearing protector consisting of circumaural cups pressed or held against the head around each pinna
[SOURCE: EN 352-1:2020, 3.1.6]
3.1.7
equivalent headband
part of the mounted earmuffs which supports the cups and is designed to enable the earmuffs to fit
securely around the ears by exerting force against the cups and pressure through the cushions
Note 1 to entry: It comprises the head protection and/or face protection device (carrier) and the cup
supporting arms and is intended to be functionally equivalent to the headband of headband earmuffs.
3.1.8
carrier
head protection and/or face protection device, primarily intended to protect the upper part of the
user's head and/or face
Note 1 to entry: Examples of suitable PPE carriers are industrial safety helmets, rigid head tops of powered and
supplied air respirator systems, climbing and rescue helmets, face shields, visors.
3.1.9
insertion loss
mean algebraic difference, in decibels, between the one-third-octave-band sound pressure level
measured by the microphone of the acoustic test fixture in a specified sound field under specified
conditions with the hearing protector absent and the sound pressure level with the hearing protector
present, with other conditions identical
[SOURCE: EN ISO 4869-3:2007, 3.5, modified — The words “mean”, “in a specified sound field under
specified conditions ” and “with other conditions identical” have been added.]
3.1.10
sound attenuation
for a given test signal, the mean difference in decibels between the threshold of hearing with and
without the hearing protector in place
Note 1 to entry: Measured in accordance with EN ISO 4869-1:2018 for a panel of test subjects.
[SOURCE: EN ISO 4869-1:2018, 3.8, modified — The words “for a given test signal” have been moved to
beginning of definition, the words “mean”, “in decibels” have been added, the words “for a test subject”
have been deleted and Note 1 to entry has been added.]
3.1.11
parking position
position of the earmuffs in which the cups are located above the level of the lower edge of the carrier
shell
Note 1 to entry: See also 3.1.12.
3.1.12
stand-by position
position of the earmuffs in which the cups are located below the level of the lower edge of the carrier
shell and in which the cushions are held away from the side of the head or pinna
Note 1 to entry: See also 3.1.11.
3.1.13
basic combination
mounted earmuffs which include the first or only model or size of carrier to which a given model of
earmuffs is fitted, and which will undergo all the tests in the standard
Note 1 to entry: See also 3.1.14.
3.1.14
supplementary combination
mounted earmuffs which include a model or size of carrier, other than the carrier of the basic
combination, to which is fitted the same model of mounted earmuffs as for the basic combination, and
which will undergo an abbreviated set of tests
Note 1 to entry: See also 3.1.13.
Note 2 to entry: The first tested combination of a model of earmuffs and a carrier is the basic combination. The
next combination of a new carrier and the same model of earmuffs is tested as a supplementary combination,
regardless when the basic combination was tested and regardless of the difference of model and size of the
carrier. This applies even if the carrier of the basic combination is not manufactured anymore.
3.1.15
hygiene cover
temporary, disposable covers fitted over the cushions and intended to protect them from the effects of
dirt, perspiration, cosmetics, etc.
[SOURCE: EN 352-1:2020, 3.1.10]
3.2 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
H High-frequency attenuation value
M Medium-frequency attenuation value
L Low-frequency attenuation value
APV Assumed Protection Value for frequency f and a protection performance of 98 %
f98
SNR Single Number Rating
PPE Personal Protective Equipment
4 Requirements
4.1 Sizing
Mounted earmuffs shall be classified into three size ranges:
— ‘medium size range’ if their adjustability complies with 4.3.2.2;
— ‘small size range’ if their adjustability complies with 4.3.2.3;
— ‘large size range’ if their adjustability complies with 4.3.2.4.
'Small size range’ and ‘large size range' mounted earmuffs shall be accompanied by the information
specified in Clause 6 m).
NOTE A model of mounted earmuffs can fall into one or more size ranges.
4.2 Materials and construction
4.2.1 Mat
...