High-efficiency filters and filter media for removing particles in air — Part 5: Test method for filter elements

This document specifies the test methods for determining the efficiency of filters at their most penetrating particle size (MPPS). It also gives guidelines for the testing and classification for filters with an MPPS of less than 0,1 μm (Annex B) and filters using media with (charged) synthetic fibres (Annex C). It is intended for use in conjunction with ISO 29463‑1, ISO 29463‑2, ISO 29463‑3 and ISO 29463‑4.

Filtres à haut rendement et filtres pour l'élimination des particules dans l'air — Partie 5: Méthode d'essai des éléments filtrants

Le présent document spécifie les méthodes d'essai pour la détermination de l’efficacité des filtres pour la taille de particule ayant la plus forte pénétration (MPPS). Il donne également des lignes directrices pour les essais et la classification des filtres avec une MPPS de moins de 0,1 µm (Annexe B) et des filtres utilisant des médias avec des fibres synthétiques (chargées) (Annexe C). Il est destiné à être utilisé conjointement avec l'ISO 29463-1, l'ISO 29463-2, l'ISO 29463-3 et l'ISO 29463-4.

General Information

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Published
Publication Date
30-Mar-2022
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5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
Start Date
14-Dec-2021
Completion Date
14-Dec-2021
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INTERNATIONAL ISO
STANDARD 29463-5
Second edition
2022-03
High-efficiency filters and filter media
for removing particles in air —
Part 5:
Test method for filter elements
Filtres à haut rendement et filtres pour l'élimination des particules
dans l'air —
Partie 5: Méthode d'essai des éléments filtrants
Reference number
ISO 29463-5:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 29463-5:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 29463-5:2022(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction .............................................................................................................................................................................................................................. vi

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

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

3 Terms, definitions, symbols and abbreviated terms ....................................................................................................1

3.1 Terms and definitions ...................................................................................................................................................................... 1

3.2 Symbols and abbreviated terms ............................................................................................................................................. 2

4 Efficiency test methods .................................................................................................................................................................................3

4.1 Reference efficiency test method ........................................................................................................................................... 3

4.2 Alternate efficiency test method for groups H and U filters .......................................................................... 3

4.3 Statistical efficiency test method for low efficiency filters — Group E filters .............................. 3

5 Test filter ......................................................................................................................................................................................................................4

6 Test apparatus ........................................................................................................................................................................................................4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Test duct ....................................................................................................................................................................................................... 5

6.2.1 Test air conditioning ....................................................................................................................................................... 5

6.2.2 Adjustment of the volume flow rate .................................................................................................................. 5

6.2.3 Measurement of the volume flow rate ............................................................................................................ 5

6.2.4 Aerosol mixing section.................................................................................................................................................. 5

6.2.5 Test filter mounting assembly ................................................................................................................................ 6

6.2.6 Measuring points for the pressure drop ....................................................................................................... 6

6.2.7 Sampling .................................................................................................................................................................................... 6

6.3 Aerosol generation and measuring instruments ..................................................................................................... 6

6.3.1 General ........................................................................................................................................................................................ 6

6.3.2 Apparatus for testing with a mono-disperse test aerosol ............................................................. 7

6.3.3 Apparatus for testing with a poly-disperse test aerosol ................................................................ 7

7 Conditions of the test air ..........................................................................................................................................................................11

8 Test procedure ....................................................................................................................................................................................................12

8.1 Preparatory checks .........................................................................................................................................................................12

8.2 Starting up the aerosol generator .......................................................................................................................................12

8.3 Preparation of the test filter ....................................................................................................................................................12

8.3.1 Installation of the test filter ..................................................................................................................................12

8.3.2 Flushing the test filter ................................................................................................................................................12

8.4 Testing .........................................................................................................................................................................................................12

8.4.1 Measuring the pressure drop ..............................................................................................................................12

8.4.2 Testing with a mono-disperse test aerosol ..............................................................................................13

8.4.3 Testing with a poly-disperse test aerosol .................................................................................................13

8.4.4 Testing filters with charged media ................................................................................................................. 13

9 Evaluation ................................................................................................................................................................................................................13

10 Test report ...............................................................................................................................................................................................................15

11 Maintenance and inspection of the test apparatus ......................................................................................................16

Annex A (normative) Alternate efficiency test method from scan testing ..............................................................17

Annex B (informative) Testing and classification method for filters with MPPS ≤ 0,1 µm

(e.g. membrane medium filters) .......................................................................................................................................................18

Annex C (normative) Method for testing and classification of filters using media with

charged fibres ......................................................................................................................................................................................................21

Annex D (informative) Traditional efficiency test methods for HEPA and ULPA filters ...........................27

iii
© ISO 2022 – All rights reserved
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ISO 29463-5:2022(E)

Bibliography .............................................................................................................................................................................................................................28

© ISO 2022 – All rights reserved
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ISO 29463-5:2022(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 142, Cleaning equipment for air and other

gases, in collaboration with the European Committee for Standardization (CEN) Technical Committee

CEN/TC 195, Air filters for general air cleaning, in accordance with the Agreement on technical

cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 29463-5:2011), which has been

technically revised.
The main changes are as follows:
— normative references have been updated;
— Annex C has been revised.
A list of all parts in the ISO 29463 series can be found on the ISO website.

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.
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 29463-5:2022(E)
Introduction

The ISO 29463 series is derived from the EN 1822 series with extensive changes to meet the requests

from non-European participating members (P-members). It contains requirements, fundamental

principles of testing and the marking for high-efficiency particulate air filters with efficiencies from

95 % to 99,999 995 % that can be used for classifying filters in general or for specific use by agreement

between users and suppliers.

The ISO 29463 series establishes a procedure for the determination of the efficiency of all filters

on the basis of a particle counting method using a liquid (or alternatively a solid) test aerosol, and

allows a standardized classification of these filters in terms of their efficiency, both local and overall

efficiency, which actually covers most requirements of different applications. The difference between

the ISO 29463 series and other national standards lies in the technique used for the determination of

the overall efficiency. Instead of mass relationships or total concentrations, this technique is based on

particle counting at the MPPS, which is, for micro-glass filter mediums, usually in the range of 0,12 μm

to 0,25 μm. This method also allows testing ultra-low-penetration air filters, which was not possible

with the previous test methods because of their inadequate sensitivity. For membrane filter media,

separate rules apply and are described in Annex B. Although no equivalent test procedures for testing

filters with charged media is prescribed, a method for dealing with these types of filters is described

in Annex C. Specific requirements for testing method, frequency, and reporting requirements can be

modified by agreement between users and suppliers. For lower-efficiency filters (group H, as described

in 4.2), alternate leak test methods are described in ISO 29463-4:2011, Annex A.

There are differences between the ISO 29463 series and other normative practices common in several

countries. For example, many of these rely on total aerosol concentrations rather than individual

particles. For information, a brief summary of these methods and their reference standards are

provided in Annex D.
© ISO 2022 – All rights reserved
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INTERNATIONAL STANDARD ISO 29463-5:2022(E)
High-efficiency filters and filter media for removing
particles in air —
Part 5:
Test method for filter elements
1 Scope

This document specifies the test methods for determining the efficiency of filters at their most

penetrating particle size (MPPS). It also gives guidelines for the testing and classification for filters with

an MPPS of less than 0,1 μm (Annex B) and filters using media with (charged) synthetic fibres (Annex C).

It is intended for use in conjunction with ISO 29463-1, ISO 29463-2, ISO 29463-3 and ISO 29463-4.

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 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-

section conduits running full — Part 1: General principles and requirements

ISO 16890-4, Air filters for general ventilation — Part 4: Conditioning method to determine the minimum

fractional test efficiency

ISO 21501-4, Determination of particle size distribution — Single particle light interaction methods —

Part 4: Light scattering airborne particle counter for clean spaces

ISO 29463-1:2017, High efficiency filters and filter media for removing particles from air — Part 1:

Classification, performance, testing and marking

ISO 29463-2:2011, High-efficiency filters and filter media for removing particles in air — Part 2: Aerosol

production, measuring equipment and particle-counting statistics

ISO 29463-3, High-efficiency filters and filter media for removing particles in air — Part 3: Testing flat

sheet filter media

ISO 29463-4:2011, High-efficiency filters and filter media for removing particles in air — Part 4: Test

method for determining leakage of filter elements-Scan method
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 29463-1, ISO 29463-2,

ISO 29463-3, ISO 29463-4, and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
© ISO 2022 – All rights reserved
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ISO 29463-5:2022(E)
3.1.1
sampling duration

time during which the particles in the sampling volume flow are counted (upstream or downstream)

[SOURCE: ISO 29464:2017, 3.2.153]
3.1.2
particle counting and sizing method

particle counting method which allows both the determination of the number of particles and also the

classification of the particles according to size
EXAMPLE By using an optical particle counter.
[SOURCE: ISO 29464:2017, 3.2.123]
3.2 Symbols and abbreviated terms
C channel for particle counters
c number concentration
d particle diameter, μm
E efficiency
k dilution factor
N particle counts
P penetration, %
p absolute pressure, Pa
T temperature, K
t sampling duration, s
volume flow rate, cm /s
Δp differential pressure, Pa
φ relative humidity, %
CPC condensation particle counter
DEHS di(2-ethylhexyl) sebacate
DMPS differential mobility particle sizer
DOP dioctyl phthalate
ePTFE expanded polytetrafluoroethylene
IPA isopropyl alcohol (isopropanol)
MPPS most penetrating particle size
OPC optical particle counter
© ISO 2022 – All rights reserved
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ISO 29463-5:2022(E)
4 Efficiency test methods
4.1 Reference efficiency test method

In order to determine the efficiency of the test filter, the test filter is fixed in the filter mounting

assembly and subjected to a test air volume flow corresponding to the nominal volume flow rate.

After the pressure drop at the nominal volumetric flow rate is measured, the test aerosol produced by

the aerosol generator is mixed with the prepared test air along a mixing section, so that it is spread

homogeneously over the cross-section of the duct.

The efficiency is always determined for the MPPS; see ISO 29463-3. The size distribution of the aerosol

particles can optionally be measured using a particle size analysis system, for example, a DMPS.

The testing can be carried out using either a mono-disperse or poly-disperse test aerosol. When testing

with (quasi-) mono-disperse aerosol, the total particle count method may be used with a CPC or an OPC,

e.g. a laser particle counter. It shall be ensured that the number median particle diameter corresponds

to the MPPS, i.e. the particle diameter at which the filter medium has its minimum efficiency.

When using a poly-disperse aerosol, the particle counting and sizing method, e.g. an OPC or DMPS, shall

be used, which, in addition to counting the particles, is also able to determine their size distribution.

It shall be ensured that the count median diameter, D , of the test aerosol lies in the range given by

Formula (1):
MPPS
< MMPPS
15,
where S is the most penetrating particle size.
MPPS

In order to determine the overall efficiency, representative partial flows are extracted on the upstream

and downstream sides of the filter element and directed to the attached particle counter via a fixed

sampling probe to measure the number of particles. It is necessary to have a mixing section behind the

test filter to mix the aerosol homogeneously with the test air over the duct cross-section (see 6.2.4).

When testing filters with large face dimensions, achieving adequate aerosol mixing may not be possible.

In these cases, the test method with moving probe described in Annex A shall be used.

4.2 Alternate efficiency test method for groups H and U filters

The standard efficiency test method, as described in 4.1, uses downstream mixing and a fixed

downstream probe. However, an alternate efficiency test method using scan test equipment with

moving probe(s) is provided and described in Annex A.

4.3 Statistical efficiency test method for low efficiency filters — Group E filters

For filters of group E, the overall efficiency shall be determined by one of the statistical test procedures

described in this subclause, and it is not necessary to carry out the test for each single filter element (as

is mandatory for filters of groups H and U). The overall efficiency of group E filters shall be determined

by averaging the results of the statistical efficiency test as described in this subclause.

A record of the filter data in the form of a type test certificate or alternatively a factory test certificate is

required. However, the supplier shall be able to provide documentary evidence to verify the published

filter data upon request. This can be done by either:

a) maintaining a certified quality management system (e.g. ISO 9000), which requires the application

of statistically based methods for testing and documenting efficiency for group E filters in

accordance with this document; or
b) using accepted statistical methods to test all of production lots of filters.

The skip lot procedure as described in ISO 2859-1 or any equivalent alternative method may be used.

© ISO 2022 – All rights reserved
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ISO 29463-5:2022(E)

The skip lot procedure as described in ISO 2859-1 implies that at the beginning, the test frequency is

high and is, in the course of further testing, reduced as the production experience grows and that the

products produced conform to the target. For example, for the first eight production lots, 100 % of the

produced filters are tested. If all the tests are positive, the frequency is reduced to half for the next

eight production lots. If all the tests are positive again, the number is reduced by half again, and so on

until it is necessary to test only one out of eight lots (e.g. the minimum test frequency). Each time one

of the tested filters fails, the test frequency is doubled again. In any case, the number of samples per lot

tested shall be greater than three filters.
5 Test filter

The filter element being tested shall show no signs of damage or any other irregularities. The filter

element shall be handled carefully and shall be clearly and permanently marked with the following

details:
— designation of the filter element;
— upstream side of the filter element.

The temperature of the test filter during the testing shall correspond with that of the test air.

6 Test apparatus
6.1 General

A flow sheet showing the arrangement of apparatus comprising a test rig is given in ISO 29463-1:2017,

Figure 4. An outline diagram of a test rig is given in Figure 1.

The fundamentals of aerosol generation and neutralization with details of suitable types of equipment

as well as detailed descriptions of the measuring instruments required for the testing are given in

ISO 29463-2.
© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 29463-5:2022(E)
Key
1 coarse dust filter 10 sampler, upstream
2 fine dust filter 11 ring pipe for differential pressure measurement
3 fan 12 manometer (Δp)
4 air heating 13 test filter mounting assembly
5 high-efficiency air filter 14 measuring damper (see ISO 5167-1)
6 aerosol inlet to the test duct 15 measurement of absolute pressure (p)
7 temperature measurement (T) 16 manometer measuring differential pressure (Δp)
8 hygrometer (φ) 17 sampler, downstream
9 sampler, particle size analysis
Figure 1 — Example of a test rig
6.2 Test duct
6.2.1 Test air conditioning

The test air conditioning equipment shall include equipment required to control the condition of the

test air so that it can be brought in conformity with the requirement of Clause 7.

6.2.2 Adjustment of the volume flow rate

Filters shall always be tested at their nominal air flow rate. It shall be possible to adjust the volume flow

rate by means of a suitable provision (e.g. by changing the speed of the fan, or with dampers) to a value

±5 % of the nominal flow rate, which shall then remain constant within ±2 % throughout each test.

6.2.3 Measurement of the volume flow rate

The volume flow rate shall be measured using a standardized or calibrated method (e.g. measurement

of the differential pressure using standardized damper equipment, such as orifice plates, or nozzles,

Venturi tubes in accordance with ISO 5167-1).
The limit error of measurement shall not exceed 5 % of the measured value.
6.2.4 Aerosol mixing section

The aerosol input and the mixing section (see Figure 1 for an example) shall be so constructed that the

aerosol concentration measured at individual points of the duct cross-section, directly in front of the

© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 29463-5:2022(E)

test filter, do not deviate by more than 10 % from the mean value of at least nine measuring points over

the channel cross-section.
6.2.5 Test filter mounting assembly

The test filter mounting assembly shall ensure that the test filter can be sealed and subjected to flow in

accordance with requirements.
It shall not obstruct any part of the filter cross-sectional area.
6.2.6 Measuring points for the pressure drop

The measuring points for pressure drop shall be so arranged that the mean value of the static pressure

in the flow upstream and downstream of the filter can be measured. The planes of the pressure

measurements upstream and downstream shall be positioned in regions of an even flow with a uniform

flow profile.

In rectangular or square test ducts, smooth holes with a diameter of 1 mm to 2 mm for the pressure

measurements shall be bored in the middle of the channel walls, normal to the direction of flow. The

four holes shall be interconnected with a circular pipe.
6.2.7 Sampling

In order to determine the efficiency, sampled volumes of air are extracted from the test volume flow

by sampling probes and led to the particle counters. The diameter of the probes shall be chosen so

that isokinetic conditions are maintained in the probe at the given volume flow rate in the duct. In

this way, sampling errors can be neglected due to the small size of the particles in the test aerosol.

The connections to the particle counter shall be as short as possible. Samples on the upstream side are

taken by a fixed sampling probe in front of the test filter. The sampling shall be representative, on the

basis that the aerosol concentration measured from the sample does not deviate by more than ±10 %

from the mean value determined in accordance with 6.2.4.

A fixed sampling probe is also installed downstream, preceded by a mixing section that ensures a

representative measurement of the downstream aerosol concentration. This is taken to be the case

when, in event of an artificially made big leak in the test filter, the aerosol concentration measured

downstream the filter does not at any point deviate by more than ±10 % from the mean value of at

least nine measuring points over the duct cross-section. It is necessary, however, to verify beforehand

that the artificially made leak is big enough to increase the filter penetration by at least a factor of five

relative to the penetration of the non-leaking filter.

The mean aerosol concentrations determined at the upstream and downstream sampling points

without the filter in position shall not differ from each other by more than 5 %.

6.3 Aerosol generation and measuring instruments
6.3.1 General

The operating parameters of the aerosol generator shall be adjusted to produce a test aerosol whose

number median diameter is in the range of the MPPS for the sheet filter medium.

The median size of the mono-disperse test aerosol shall not deviate from the MPPS by more than ±10 %.

A deviation of ±50 % is allowed when using a poly-disperse aerosol.

The particle output of the aerosol generator shall be adjusted according to the test volume flow rate

and the filter efficiency, so that the counting rates on the upstream and downstream sides lie under the

coincidence limits of the counter (the maximum coincidence error shall be of 10 % in accordance with

ISO 21501-4), and significantly above the zero-count rate of the instruments.
© ISO 2022 – All rights reserved
---------------------- Page: 12 ----------------------
ISO 29463-5:2022(E)

The number distribution concentration of the test aerosol can be determined using a suitable particle

size analysis system (e.g. a DMPS) or with an OPC suitable for these test purposes. The limit error of the

measurement method used to determine the number median value shall not ex
...

NORME ISO
INTERNATIONALE 29463-5
Deuxième édition
2022-03
Filtres à haut rendement et filtres
pour l'élimination des particules dans
l'air —
Partie 5:
Méthode d'essai des éléments filtrants
High-efficiency filters and filter media for removing particles in air —
Part 5: Test method for filter elements
Numéro de référence
ISO 29463-5:2022(F)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 29463-5:2022(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2022

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette

publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,

y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut

être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
© ISO 2022 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 29463-5:2022(F)
Sommaire Page

Avant-propos ...............................................................................................................................................................................................................................v

Introduction .............................................................................................................................................................................................................................. vi

1 Domaine d'application ...................................................................................................................................................................................1

2 Références normatives ..................................................................................................................................................................................1

3 Termes, définitions, symboles et termes abrégés ............................................................................................................ 1

3.1 Termes et définitions ........................................................................................................................................................................ 1

3.2 Symboles et termes abrégés ....................................................................................................................................................... 2

4 Méthodes d'essai d'efficacité ..................................................................................................................................................................3

4.1 Méthode d'essai d'efficacité de référence ....................................................................................................................... 3

4.2 Autre méthode d'essai d'efficacité pour les filtres des groupes H et U ................................................ 3

4.3 Méthode d'essai d'efficacité statistique pour les filtres à faible efficacité — Filtres

du groupe E ................................................................................................................................................................................................ 3

5 Filtre d'essai .............................................................................................................................................................................................................. 4

6 Appareillage d'essai..........................................................................................................................................................................................4

6.1 Généralités ................................................................................................................................................................................................. 4

6.2 Conduit d'essai ........................................................................................................................................................................................ 5

6.2.1 Conditionnement de l'air d'essai ........................................................................................................................... 5

6.2.2 Réglage du débit volumique...................................................................................................................................... 5

6.2.3 Mesurage du débit volumique ................................................................................................................................. 5

6.2.4 Section de mélange de l'aérosol ............................................................................................................................ 6

6.2.5 Dispositif de montage pour filtre d'essai ...................................................................................................... 6

6.2.6 Points de mesure de la perte de charge ......................................................................................................... 6

6.2.7 Échantillonnage................................................................................................................................................................... 6

6.3 Génération d'aérosol et instruments de mesure ...................................................................................................... 6

6.3.1 Généralités ............................................................................................................................................................................... 6

6.3.2 Appareillage d'essai avec un aérosol d'essai monodispersé ........................................................ 7

6.3.3 Appareillage d'essai avec un aérosol d'essai polydispersé ........................................................... 7

7 Conditions de l'air d'essai ........................................................................................................................................................................11

8 Mode opératoire d'essai ............................................................................................................................................................................12

8.1 Vérifications préalables ...............................................................................................................................................................12

8.2 Démarrage du générateur d'aérosol .................................................................................................................................12

8.3 Préparation du filtre d'essai ....................................................................................................................................................12

8.3.1 Installation du filtre d'essai ...................................................................................................................................12

8.3.2 Purge du filtre d'essai .................................................................................................................................................12

8.4 Essais ............................................................................................................................................................................................................12

8.4.1 Mesurage de la perte de charge .........................................................................................................................12

8.4.2 Essai avec un aérosol d'essai monodispersé ...........................................................................................13

8.4.3 Essai avec un aérosol d'essai polydispersé ..............................................................................................13

8.4.4 Essai de filtres avec des médias chargés ...................................................................................................13

9 Évaluation ................................................................................................................................................................................................................13

10 Rapport d'essai ...................................................................................................................................................................................................15

11 Maintenance et inspection de l'appareillage d'essai ..................................................................................................16

Annexe A (normative) Méthode d'essai d'efficacité alternative à partir d'un essai

d'exploration .........................................................................................................................................................................................................17

Annexe B (informative) Méthode d’essai et de classification des filtres avec une

MPPS ≤ 0,1 μm (par exemple, filtres à membrane) ......................................................................................................18

Annexe C (normative) Méthode pour l’essai et la classification des filtres utilisant

des médias avec des fibres chargées ...........................................................................................................................................21

iii
© ISO 2022 – Tous droits réservés
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ISO 29463-5:2022(F)

Annexe D (informative) Méthodes traditionnelles d'essai d'efficacité des filtres HEPA et

ULPA ...............................................................................................................................................................................................................................27

Bibliographie ...........................................................................................................................................................................................................................28

© ISO 2022 – Tous droits réservés
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ISO 29463-5:2022(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes

nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est

en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.

L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a

été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir

www.iso.org/directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www.iso.org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la nature volontaire des normes, la signification des termes et expressions

spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion

de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles

techniques au commerce (OTC), voir www.iso.org/avant-propos.

Le présent document a été élaboré par le comité technique ISO/TC 142, Séparateurs aérauliques,

en collaboration avec le comité technique CEN/TC 195, Filtres air pour la propreté de l'air, du Comité

européen de normalisation (CEN), conformément à l'accord de coopération technique entre l'ISO et le

CEN (Accord de Vienne).

Cette deuxième édition annule et remplace la première édition (ISO 29463-5:2011), qui a fait l’objet

d’une révision technique.
Les principales modifications sont les suivantes:
— les références normatives ont été mises à jour;
— l’Annexe C a été révisée.

Une liste de toutes les parties de la série ISO 29463 se trouve sur le site web de l’ISO.

Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent

document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes

se trouve à l’adresse www.iso.org/fr/members.html.
© ISO 2022 – Tous droits réservés
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ISO 29463-5:2022(F)
Introduction

La série ISO 29463 découle de la série EN 1822 avec des changements importants pour répondre aux

demandes de membres participants non-européens (membres P). Elle donne les exigences, les principes

fondamentaux d'essai et le marquage pour les filtres à air à haut rendement d'efficacité ayant une

efficacité comprise entre 95 % et 99,999 995 % qui peuvent être utilisés pour classifier les filtres en

général ou pour un usage spécifique par accord entre utilisateurs et fournisseurs.

La série ISO 29463 définit un mode opératoire de détermination de l'efficacité de tous les filtres, à partir

d'une méthode de comptage de particules utilisant un aérosol d'essai liquide (ou solide), et permet

une classification normalisée de ces filtres en fonction de leur efficacité, efficacité locale et globale,

qui couvre effectivement la plupart des exigences des différentes applications. La différence entre

la série ISO 29463 et les autres normes nationales se situe au niveau de la technique utilisée pour la

détermination de l'efficacité globale. Plutôt que sur les relations de masses ou les concentrations totales,

cette technique s'appuie sur le comptage des particules à la MPPS, qui est, pour les médias filtrants en

micro-verre, généralement dans la plage de 0,12 µm à 0,25 µm. Cette méthode permet également de

soumettre à essai les filtres à air à très faible pénétration, ce qui n'était pas possible avec les méthodes

d'essai précédentes en raison de leur sensibilité insuffisante. Pour les médias filtrants à membrane,

des règles différentes s'appliquent et sont décrites en Annexe B. Bien qu'aucun mode opératoire d’essai

équivalent pour les essais des filtres munis de médias chargés ne soit prescrit, une méthode pour traiter

ces types de filtres est décrite à l’Annexe C. Les exigences spécifiques concernant la méthode d'essai, la

fréquence, et les exigences de déclaration peuvent être modifiées par accord entre les utilisateurs et

les fournisseurs. Pour les filtres à faible efficacité (groupe H, tel que décrit en 4.2), d'autres méthodes

d'essais d'étanchéité sont décrites dans l'ISO 29463-4:2011, Annexe A.

Il existe des différences entre la série ISO 29463 et d'autres pratiques normatives courantes dans

plusieurs pays. Par exemple, beaucoup d'entre elles s'appuient sur les concentrations totales d'aérosols

plutôt que sur les particules individuelles. À titre informatif, une description succincte de ces méthodes

et leurs normes de référence sont fournies en Annexe D.
© ISO 2022 – Tous droits réservés
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NORME INTERNATIONALE ISO 29463-5:2022(F)
Filtres à haut rendement et filtres pour l'élimination des
particules dans l'air —
Partie 5:
Méthode d'essai des éléments filtrants
1 Domaine d'application

Le présent document spécifie les méthodes d'essai pour la détermination de l’efficacité des filtres pour

la taille de particule ayant la plus forte pénétration (MPPS). Il donne également des lignes directrices

pour les essais et la classification des filtres avec une MPPS de moins de 0,1 µm (Annexe B) et des filtres

utilisant des médias avec des fibres synthétiques (chargées) (Annexe C). Il est destiné à être utilisé

conjointement avec l'ISO 29463-1, l'ISO 29463-2, l'ISO 29463-3 et l'ISO 29463-4.
2 Références normatives

Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie de leur

contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.

Pour les références non datées, la dernière édition du document de référence s'applique (y compris les

éventuels amendements).

ISO 5167-1, Mesure de débit des fluides au moyen d’appareils déprimogènes insérés dans des conduites en

charge de section circulaire — Partie 1: Principes généraux et exigences générales

ISO 16890-4, Filtres à air de ventilation générale — Partie 4: Méthode de conditionnement afin de

déterminer l’efficacité spectrale minimum d’essai

ISO 21501-4, Détermination de la distribution granulométrique — Méthodes d'interaction lumineuse de

particules uniques — Partie 4: Compteur de particules en suspension dans l'air en lumière dispersée pour

espaces propres

ISO 29463-1:2017, Filtres et media à très haute efficacité pour la rétention particulaire — Partie 1:

Classification, essais de performance et marquage

ISO 29463-2:2011, Filtres à haut rendement et filtres pour l'élimination des particules dans l'air — Partie 2:

Production d'aérosol, équipement de mesure et statistique de comptage de particules

ISO 29463-3, Filtres à haut rendement et filtres pour l'élimination des particules dans l'air — Partie 3:

Méthode d'essai des filtres à feuille plate

ISO 29463-4:2011, Filtres à haut rendement et filtres pour l'élimination des particules dans l'air — Partie 4:

Méthode d'essai pour déterminer l'étanchéité de l'élément filtrant (méthode scan)

3 Termes, définitions, symboles et termes abrégés
3.1 Termes et définitions

Pour les besoins du présent document, les termes et définitions donnés dans l'ISO 29463-1, l'ISO 29463-2,

l'ISO 29463-3, l'ISO 29463-4, ainsi que les suivants s'appliquent.
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ISO 29463-5:2022(F)

L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en

normalisation, consultables aux adresses suivantes:

— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp

— IEC Electropedia: disponible à l’adresse https:// www .electropedia .org/
3.1.1
durée d'échantillonnage

période pendant laquelle les particules dans le débit volumique d'échantillonnage sont comptées (en

amont ou en aval)
[SOURCE: ISO 29464:2017, 3.2.153]
3.1.2
méthode de comptage et de dimensionnement des particules

méthode de comptage des particules permettant à la fois la détermination du nombre de particules et la

classification des particules selon leur taille
EXEMPLE En utilisant un compteur optique de particules.
[SOURCE: ISO 29464:2017, 3.2.123]
3.2 Symboles et termes abrégés
C canal pour les compteurs de particules
c concentration en nombre
d diamètre de particule, μm
E efficacité
k facteur de dilution
N comptage des particules
P pénétration, %
p pression absolue, Pa
T température, K
t durée de l'échantillonnage, s
débit volumique, cm /s
Δp pression différentielle, Pa
φ humidité relative, %
CPC compteur de particules de condensation
DEHS sébacate de di(2-éthylhexyle)
DMPS granulomètre à mobilité différentielle
DOP phtalate de dioctyle
ePTFE polytétrafluoroéthylène expansé
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ISO 29463-5:2022(F)
IPA alcool isopropylique (isopropanol)
MPPS taille de particule ayant la plus forte pénétration
OPC compteur optique de particules
4 Méthodes d'essai d'efficacité
4.1 Méthode d'essai d'efficacité de référence

Afin de déterminer l’efficacité du filtre d'essai, le filtre d'essai est fixé dans le dispositif de montage

pour filtre et soumis à un débit volumique d'air d'essai correspondant au débit volumique nominal.

Après avoir mesuré la perte de charge au débit volumique nominal, l’aérosol d’essai produit par le

générateur d’aérosol est mélangé à l'air d'essai préparé dans une section de mélange, de manière à le

répartir de manière homogène sur la section droite du conduit.

L'efficacité est toujours déterminée pour la MPPS; voir l'ISO 29463-3. La distribution granulométrique

des particules d'aérosol peut éventuellement être mesurée à l'aide d'un système d'analyse de la taille

des particules, par exemple, un DMPS.

Les essais peuvent être réalisés en utilisant un aérosol d'essai mono-dispersé ou polydispersé. Lors

d'un essai avec un aérosol (quasi-)monodispersé, la méthode de comptage total de particules peut être

utilisée avec un CPC ou un OPC, par exemple un compteur à noyau de condensation à laser. Il doit être

garanti que le diamètre médian de particules en nombre correspond à la MPPS, c'est-à-dire le diamètre

des particules pour lequel le média filtrant à une efficacité minimum.

Lors de l'utilisation d'un aérosol polydispersé, la méthode de comptage et de dimensionnement des

particules, par exemple un OPC ou un DMPS, doit être utilisée, laquelle, en plus de compter les particules,

est également capable de déterminer leur granulométrie. Il doit être garanti que le diamètre moyen de

comptage, D , de l'aérosol d'essai est dans la plage donnée par la Formule (1):
MPPS
< MMPPS
15,
où S est la taille de particule ayant la plus forte pénétration.
MPPS

Afin de déterminer l'efficacité globale, des débits partiels représentatifs sont extraits côtés amont et aval

de l'élément filtrant et dirigés vers le compteur de particules associé via une sonde d'échantillonnage

fixe pour mesurer le nombre de particules. Il est nécessaire d'avoir une section de mélange derrière

le filtre d'essai afin de mélanger l'aérosol de façon homogène avec l'air d'essai sur la section droite du

conduit (voir le 6.2.4). Lors de l'essai de filtres avec des dimensions frontales importantes, obtenir un

mélange adéquat de l’aérosol peut s'avérer impossible. Dans ce cas, la méthode d'essai avec sonde mobile

décrite à l'Annexe A doit être utilisée.
4.2 Autre méthode d'essai d'efficacité pour les filtres des groupes H et U

La méthode normalisée d'essai d'efficacité, telle que décrite en 4.1, utilise un mélange aval et une sonde

aval fixe. Toutefois, une autre méthode d'essai d'efficacité utilisant un équipement d'essai d'exploration

avec une (des) sonde(s) mobile(s) est fournie et décrite à l'Annexe A.

4.3 Méthode d'essai d'efficacité statistique pour les filtres à faible efficacité — Filtres

du groupe E

Pour les filtres du groupe E, l'efficacité globale doit être déterminée selon l'un des modes opératoires

d'essais statistiques décrits dans le présent paragraphe, et il n'est pas nécessaire de réaliser l’essai

pour chaque élément filtrant individuel (comme cela est obligatoire pour les filtres des groupes H et

© ISO 2022 – Tous droits réservés
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ISO 29463-5:2022(F)

U). L'efficacité globale des filtres du groupe E doit être déterminée en moyennant les résultats de l'essai

d'efficacité statistique comme décrit dans le présent paragraphe.

Un enregistrement des données du filtre sous la forme d'un certificat d'essai de type ou sinon d'un

certificat d'essai en usine est requis. Cependant, le fournisseur doit être capable de fournir une preuve

documentée afin de vérifier les données des filtres publiées sur demande. Cela peut être réalisé:

a) en maintenant un système de management de la qualité certifié (par exemple, ISO 9000), qui

nécessite l'application de méthodes statistiques pour soumettre à essai et documenter l'efficacité

des filtres du groupe E conformément au présent document; ou

b) en utilisant des méthodes statistiques reconnues pour soumettre à essai l'ensemble des lots de

production de filtres.

Le mode opératoire d'échantillonnage successif partiel tel que décrit dans l'ISO 2859-1 ou toute autre

méthode équivalente peut être utilisé.

Le mode opératoire d'échantillonnage successif partiel tel que décrit dans l'ISO 2859-1 implique qu’au

début, la fréquence d'essai soit élevée et qu’elle soit, au cours des essais supplémentaires, réduite à

mesure que l'expérience en cours de production augmente et que les produits fabriqués se conforment à

l'objectif. Par exemple, pour les huit premiers lots de production, 100 % des filtres produits sont soumis

à essai. Si tous les essais sont positifs, la fréquence est réduite de moitié pour les huit lots de production

suivants. Si tous les essais sont à nouveau positifs, le nombre est à nouveau réduit de moitié, et ainsi de

suite jusqu'à ce qu'il soit nécessaire de soumettre à essai un seul des huit lots (par exemple, la fréquence

minimale d'essai). Chaque fois que l'un des filtres d'essai est défaillant, la fréquence d'essai est à

nouveau doublée. Dans tous les cas, le nombre d'échantillons par lot soumis à essai doit être supérieur

à trois filtres.
5 Filtre d'essai

L'élément filtrant soumis à essai ne doit présenter aucun signe de détérioration ni aucune autre

irrégularité. L'élément filtrant doit être manipulé avec précaution et doit porter un marquage clair et

permanent donnant les détails suivants:
— la désignation de l'élément filtrant;
— le côté amont de l'élément filtrant.

La température du filtre d'essai pendant l'essai doit correspondre à celle de l'air d'essai.

6 Appareillage d'essai
6.1 Généralités

Un organigramme montrant la disposition des appareils y compris un banc d'essai est donné dans

l’ISO 29463-1:2017, Figure 4. Un schéma synoptique d'un banc d'essai est donné à la Figure 1.

Les principes de base de la génération et de la neutralisation des aérosols avec des détails sur les types

d'équipement appropriés ainsi que des descriptions détaillées des instruments de mesure requis pour

les essais sont donnés dans l’ISO 29463-2.
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ISO 29463-5:2022(F)
Légende
1 filtre de poussière grossière 10 échantillonneur, amont
2 filtre de poussière fine 11 conduit annulaire pour le mesurage de la pression
différentielle
3 ventilateur 12 manomètre (Δp)
4 chauffage de l'air 13 dispositif de montage pour filtre d'essai
5 filtre à air à très haute efficacité 14 registre de mesure (voir l’ISO 5167-1)
6 entrée d'aérosol dans le conduit d'essai 15 mesure de la pression absolue (p)

7 mesure de la température (T) 16 manomètre de mesure de la pression différentielle (Δp)

8 hygromètre (φ) 17 échantillonneur, aval
9 échantillonneur, analyse granulométrique
Figure 1 — Exemple de banc d'essai
6.2 Conduit d'essai
6.2.1 Conditionnement de l'air d'essai

L'équipement de conditionnement de l'air d'essai doit comprendre l'équipement requis pour le contrôle

de l'état de l'air d'essai de sorte qu'il puisse être mis en conformité avec l'exigence de l'Article 7.

6.2.2 Réglage du débit volumique

Les filtres doivent toujours être soumis à essai à leur débit d'air nominal. Il doit être possible de

régler le débit volumique à l'aide d'une disposition appropriée (par exemple, en modifiant la vitesse

du ventilateur, ou à l'aide de registres) à une valeur de ± 5 % du débit nominal, qui doit alors rester

constant à ± 2 % pendant toute la durée de chaque essai.
6.2.3 Mesurage du débit volumique

Le débit volumique doit être mesuré à l'aide d'une méthode normalisée ou étalonnée (par exemple,

mesurage de la pression différentielle à l'aide d'un système de registres normalisés, tels que

diaphragmes, buses, tubes de Venturi conformes à l'ISO 5167-1).
L'erreur limite de mesure ne doit pas dépasser 5 % de la valeur mesurée.
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ISO 29463-5:2022(F)
6.2.4 Section de mélange de l'aérosol

L'entrée d'aérosol et la section de mélange (voir la Figure 1 pour un exemple) doivent être construits de

manière à ce que la concentration d'aérosol mesurée en des points isolés de la section droite du conduit,

directement devant le filtre d'essai, ne s'écarte pas de plus de 10 % de la valeur moyenne d'au moins

neuf points de mesure sur la section droite du conduit.
6.2.5 Dispositif de montage pour filtre d'essai

Le dispositif de montage pour filtre d'essai doit garantir que le filtre d'essai peut être scellé et soumis

au débit conformément aux exigences.
Il ne doit obstruer aucune partie de la section droite du filtre.
6.2.6 Points de mesure de la perte de charge

Les points de mesure pour la perte de charge doivent être disposés de manière à ce que la valeur

moyenne de la pression statique du débit en amont et en aval du filtre puisse être mesurée. Les plans

des mesures de pression en amont et en aval doivent être positionnés dans des zones de débit régulier

avec un profil de débit uniforme.

Dans les conduits d'essai rectangulaires ou carrés, des trous lisses d’un diamètre de 1 mm à 2 mm pour

les mesures de pression doivent être percés au centre des parois du conduit, perpendiculairement à la

direction d
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 29463-5
ISO/TC 142
High-efficiency filters and filter media
Secretariat: UNI
for removing particles in air —
Voting begins on:
2021-12-14
Part 5:
Voting terminates on:
Test method for filter elements
2022-02-08
Filtres à haut rendement et filtres pour l'élimination des particules
dans l'air —
Partie 5: Méthode d'essai des éléments filtrants
ISO/CEN PARALLEL PROCESSING
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 29463-5:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 29463-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
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ISO/FDIS 29463-5:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction .............................................................................................................................................................................................................................. vi

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

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

3 Terms, definitions, symbols and abbreviated terms ....................................................................................................1

3.1 Terms and definitions ...................................................................................................................................................................... 1

3.2 Symbols and abbreviated terms ............................................................................................................................................. 2

4 Efficiency test methods .................................................................................................................................................................................3

4.1 Reference efficiency test method ........................................................................................................................................... 3

4.2 Alternate efficiency test method for groups H and U filters .......................................................................... 3

4.3 Statistical efficiency test method for low efficiency filters — Group E filters .............................. 3

5 Test filter ......................................................................................................................................................................................................................4

6 Test apparatus ........................................................................................................................................................................................................4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Test duct ....................................................................................................................................................................................................... 5

6.2.1 Test air conditioning ....................................................................................................................................................... 5

6.2.2 Adjustment of the volume flow rate .................................................................................................................. 5

6.2.3 Measurement of the volume flow rate ............................................................................................................ 5

6.2.4 Aerosol mixing section.................................................................................................................................................. 5

6.2.5 Test filter mounting assembly ................................................................................................................................ 6

6.2.6 Measuring points for the pressure drop ....................................................................................................... 6

6.2.7 Sampling .................................................................................................................................................................................... 6

6.3 Aerosol generation and measuring instruments ..................................................................................................... 6

6.3.1 General ........................................................................................................................................................................................ 6

6.3.2 Apparatus for testing with a mono-disperse test aerosol ............................................................. 7

6.3.3 Apparatus for testing with a poly-disperse test aerosol ................................................................ 7

7 Conditions of the test air ..........................................................................................................................................................................11

8 Test procedure ....................................................................................................................................................................................................12

8.1 Preparatory checks .........................................................................................................................................................................12

8.2 Starting up the aerosol generator .......................................................................................................................................12

8.3 Preparation of the test filter ....................................................................................................................................................12

8.3.1 Installation of the test filter ..................................................................................................................................12

8.3.2 Flushing the test filter ................................................................................................................................................12

8.4 Testing .........................................................................................................................................................................................................12

8.4.1 Measuring the pressure drop ..............................................................................................................................12

8.4.2 Testing with a mono-disperse test aerosol .............................................................................................. 13

8.4.3 Testing with a poly-disperse test aerosol ................................................................................................. 13

8.4.4 Testing filters with charged media ................................................................................................................. 13

9 Evaluation ................................................................................................................................................................................................................13

10 Test report ...............................................................................................................................................................................................................15

11 Maintenance and inspection of the test apparatus ......................................................................................................16

Annex A (normative) Alternate efficiency test method from scan testing ..............................................................17

Annex B (informative) Testing and classification method for filters with MPPS ≤ 0,1 µm

(e.g. membrane medium filters) .......................................................................................................................................................18

Annex C (normative) Method for testing and classification of filters using media with

charged fibres ......................................................................................................................................................................................................21

Annex D (informative) Traditional efficiency test methods for HEPA and ULPA filters ...........................27

iii
© ISO 2021 – All rights reserved
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ISO/FDIS 29463-5:2021(E)

Bibliography .............................................................................................................................................................................................................................28

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ISO/FDIS 29463-5:2021(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 142, Cleaning equipment for air and other

gases, in collaboration with the European Committee for Standardization (CEN) Technical Committee

CEN/TC 195, Air filters for general air cleaning, in accordance with the Agreement on technical

cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 29463-5:2011), which has been

technically revised.
The main changes compared to the previous edition are as follows:
— normative references are updated;
— Annex C is revised.
A list of all parts in the ISO 29463 series can be found on the ISO website.

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.
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ISO/FDIS 29463-5:2021(E)
Introduction

The ISO 29463 series is derived from the EN 1822 series with extensive changes to meet the requests

from non-European participating members (P-members). It contains requirements, fundamental

principles of testing and the marking for high-efficiency particulate air filters with efficiencies from

95 % to 99,999 995 % that can be used for classifying filters in general or for specific use by agreement

between users and suppliers.

The ISO 29463 series establishes a procedure for the determination of the efficiency of all filters

on the basis of a particle counting method using a liquid (or alternatively a solid) test aerosol, and

allows a standardized classification of these filters in terms of their efficiency, both local and overall

efficiency, which actually covers most requirements of different applications. The difference between

the ISO 29463 series and other national standards lies in the technique used for the determination of

the overall efficiency. Instead of mass relationships or total concentrations, this technique is based on

particle counting at the MPPS, which is, for micro-glass filter mediums, usually in the range of 0,12 μm

to 0,25 μm. This method also allows testing ultra-low-penetration air filters, which was not possible

with the previous test methods because of their inadequate sensitivity. For membrane filter media,

separate rules apply and are described in Annex B. Although no equivalent test procedures for testing

filters with charged media is prescribed, a method for dealing with these types of filters is described

in Annex C. Specific requirements for testing method, frequency, and reporting requirements can be

modified by agreement between users and suppliers. For lower-efficiency filters (group H, as described

in 4.2), alternate leak test methods are described in ISO 29463-4:2011, Annex A.

There are differences between the ISO 29463 series and other normative practices common in several

countries. For example, many of these rely on total aerosol concentrations rather than individual

particles. For information, a brief summary of these methods and their reference standards are

provided in Annex D.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 29463-5:2021(E)
High-efficiency filters and filter media for removing
particles in air —
Part 5:
Test method for filter elements
1 Scope

This document specifies the test methods for determining the efficiency of filters at their most

penetrating particle size (MPPS). It also gives guidelines for the testing and classification for filters with

an MPPS of less than 0,1 μm (Annex B) and filters using media with (charged) synthetic fibres (Annex C).

It is intended for use in conjunction with ISO 29463-1, ISO 29463-2, ISO 29463-3 and ISO 29463-4.

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 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-

section conduits running full — Part 1: General principles and requirements

ISO 16890-4, Air filters for general ventilation — Part 4: Conditioning method to determine the minimum

fractional test efficiency

ISO 21501-4, Determination of particle size distribution — Single particle light interaction methods —

Part 4: Light scattering airborne particle counter for clean spaces

ISO 29463-1:2017, High efficiency filters and filter media for removing particles from air — Part 1:

Classification, performance, testing and marking

ISO 29463-2:2011, High-efficiency filters and filter media for removing particles in air — Part 2: Aerosol

production, measuring equipment and particle-counting statistics

ISO 29463-3, High-efficiency filters and filter media for removing particles in air — Part 3: Testing flat

sheet filter media

ISO 29463-4:2011, High-efficiency filters and filter media for removing particles in air — Part 4: Test

method for determining leakage of filter elements-Scan method
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 29463-1, ISO 29463-2,

ISO 29463-3, ISO 29463-4, and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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ISO/FDIS 29463-5:2021(E)
3.1.1
sampling duration

time during which the particles in the sampling volume flow are counted (upstream or downstream)

[SOURCE: ISO 29464:2017, 3.2.153]
3.1.2
particle counting and sizing method

particle counting method which allows both the determination of the number of particles and also the

classification of the particles according to size
EXAMPLE By using an optical particle counter (OPC).
[SOURCE: ISO 29464:2017, 3.2.123]
3.2 Symbols and abbreviated terms
C channel for particle counters
c number concentration
d particle diameter, μm
E efficiency
k dilution factor
N particle counts
P penetration, %
p absolute pressure, Pa
T temperature, K
t sampling duration, s
volume flow rate, cm /s
Δp differential pressure, Pa
φ relative humidity, %
CPC condensation particle counter
DEHS di(2-ethylhexyl) sebacate
DMPS differential mobility particle sizer
DOP dioctyl phthalate
ePTFE expanded polytetrafluoroethylene
IPA isopropyl alcohol (isopropanol)
MPPS most penetrating particle size
OPC optical particle counter
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ISO/FDIS 29463-5:2021(E)
4 Efficiency test methods
4.1 Reference efficiency test method

In order to determine the efficiency of the test filter, the test filter is fixed in the filter mounting

assembly and subjected to a test air volume flow corresponding to the nominal volume flow rate.

After the pressure drop at the nominal volumetric flow rate is measured, the test aerosol produced by

the aerosol generator is mixed with the prepared test air along a mixing section, so that it is spread

homogeneously over the cross-section of the duct.

The efficiency is always determined for the MPPS; see ISO 29463-3. The size distribution of the aerosol

particles can optionally be measured using a particle size analysis system, for example, a DMPS.

The testing can be carried out using either a mono-disperse or poly-disperse test aerosol. When testing

with (quasi-) mono-disperse aerosol, the total particle count method may be used with a CPC or an OPC,

e.g. a laser particle counter. It shall be ensured that the number median particle diameter corresponds

to the MPPS, i.e. the particle diameter at which the filter medium has its minimum efficiency.

When using a poly-disperse aerosol, the particle counting and sizing method, e.g. an OPC or DMPS, shall

be used, which, in addition to counting the particles, is also able to determine their size distribution.

It shall be ensured that the count median diameter, D , of the test aerosol lies in the range given by

Formula (1):
MPPS
< MMPPS
15,
where S is the most penetrating particle size.
MPPS

In order to determine the overall efficiency, representative partial flows are extracted on the upstream

and downstream sides of the filter element and directed to the attached particle counter via a fixed

sampling probe to measure the number of particles. It is necessary to have a mixing section behind the

test filter to mix the aerosol homogeneously with the test air over the duct cross-section (see 6.2.4).

When testing filters with large face dimensions, achieving adequate aerosol mixing may not be possible.

In these cases, the test method with moving probe described in Annex A shall be used.

4.2 Alternate efficiency test method for groups H and U filters

The standard efficiency test method, as described in 4.1, uses downstream mixing and a fixed

downstream probe. However, an alternate efficiency test method using scan test equipment with

moving probe(s) is provided and described in Annex A.

4.3 Statistical efficiency test method for low efficiency filters — Group E filters

For filters of group E, the overall efficiency shall be determined by one of the statistical test procedures

described in this subclause, and it is not necessary to carry out the test for each single filter element (as

is mandatory for filters of groups H and U). The overall efficiency of group E filters shall be determined

by averaging the results of the statistical leak test as described in this subclause.

A record of the filter data in the form of a type test certificate or alternatively a factory test certificate is

required. However, the supplier shall be able to provide documentary evidence to verify the published

filter data upon request. This can be done by either:

a) maintaining a certified quality management system (e.g. ISO 9000), which requires the application

of statistically based methods for testing and documenting efficiency for group E filters in

accordance with this document; or
b) using accepted statistical methods to test all of production lots of filters.

The skip lot procedure as described in ISO 2859-1 or any equivalent alternative method may be used.

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ISO/FDIS 29463-5:2021(E)

The skip lot procedure as described in ISO 2859-1 implies that at the beginning, the test frequency is

high and is, in the course of further testing, reduced as the production experience grows and that the

products produced conform to the target. For example, for the first eight production lots, 100 % of the

produced filters are tested. If all the tests are positive, the frequency is reduced to half for the next

eight production lots. If all the tests are positive again, the number is reduced by half again, and so on

until it is necessary to test only one out of eight lots (e.g. the minimum test frequency). Each time one

of the tested filters fails, the test frequency is doubled again. In any case, the number of samples per lot

tested shall be greater than three filters.
5 Test filter

The filter element being tested shall show no signs of damage or any other irregularities. The filter

element shall be handled carefully and shall be clearly and permanently marked with the following

details:
— designation of the filter element;
— upstream side of the filter element.

The temperature of the test filter during the testing shall correspond with that of the test air.

6 Test apparatus
6.1 General

A flow sheet showing the arrangement of apparatus comprising a test rig is given in ISO 29463-1:2017,

Figure 4. An outline diagram of a test rig is given in Figure 1.

The fundamentals of aerosol generation and neutralization with details of suitable types of equipment

as well as detailed descriptions of the measuring instruments required for the testing are given in

ISO 29463-2.
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ISO/FDIS 29463-5:2021(E)
Key
1 coarse dust filter 10 sampler, upstream
2 fine dust filter 11 ring pipe for differential pressure measurement
3 fan 12 manometer (Δp)
4 air heating 13 test filter mounting assembly
5 high-efficiency air filter 14 measuring damper (see ISO 5167-1)
6 aerosol inlet to the test duct 15 measurement of absolute pressure (p)
7 temperature measurement (T) 16 manometer measuring differential pressure (Δp)
8 hygrometer (φ) 17 sampler, downstream
9 sampler, particle size analysis
Figure 1 — Example of a test rig
6.2 Test duct
6.2.1 Test air conditioning

The test air conditioning equipment shall include equipment required to control the condition of the

test air so that it can be brought in conformity with the requirement of Clause 7.

6.2.2 Adjustment of the volume flow rate

Filters shall always be tested at their nominal air flow rate. It shall be possible to adjust the volume flow

rate by means of a suitable provision (e.g. by changing the speed of the fan, or with dampers) to a value

±5 % of the nominal flow rate, which shall then remain constant within ±2 % throughout each test.

6.2.3 Measurement of the volume flow rate

The volume flow rate shall be measured using a standardized or calibrated method (e.g. measurement

of the differential pressure using standardized damper equipment, such as orifice plates, or nozzles,

Venturi tubes in accordance with ISO 5167-1).
The limit error of measurement shall not exceed 5 % of the measured value.
6.2.4 Aerosol mixing section

The aerosol input and the mixing section (see Figure 1 for an example) shall be so constructed that the

aerosol concentration measured at individual points of the duct cross-section, directly in front of the

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ISO/FDIS 29463-5:2021(E)

test filter, do not deviate by more than 10 % from the mean value of at least nine measuring points over

the channel cross-section.
6.2.5 Test filter mounting assembly

The test filter mounting assembly shall ensure that the test filter can be sealed and subjected to flow in

accordance with requirements.
It shall not obstruct any part of the filter cross-sectional area.
6.2.6 Measuring points for the pressure drop

The measuring points for pressure drop shall be so arranged that the mean value of the static pressure

in the flow upstream and downstream of the filter can be measured. The planes of the pressure

measurements upstream and downstream shall be positioned in regions of an even flow with a uniform

flow profile.

In rectangular or square test ducts, smooth holes with a diameter of 1 mm to 2 mm for the pressure

measurements shall be bored in the middle of the channel walls, normal to the direction of flow. The

four holes shall be interconnected with a circular pipe.
6.2.7 Sampling

In order to determine the efficiency, sampled volumes of air are extracted from the test volume flow

by sampling probes and led to the particle counters. The diameter of the probes shall be chosen so

that isokinetic conditions are maintained in the in the probe at the given volume flow rate in the duct.

In this way, sampling errors can be neglected due to the small size of the particles in the test aerosol.

The connections to the particle counter shall be as short as possible. Samples on the upstream side are

taken by a fixed sampling probe in front of the test filter. The sampling shall be representative, on the

basis that the aerosol concentration measured from the sample does not deviate by more than ±10 %

from the mean value determined in accordance with 6.2.4.

A fixed sampling probe is also installed downstream, preceded by a mixing section that ensures a

representative measurement of the downstream aerosol concentration. This is taken to be the case

when, in event of an artificially made big leak in the test filter, the aerosol concentration measured

downstream the filter does not at any point deviate by more than ±10 % from the mean value of at

least nine measuring points over the duct cross-section. It is necessary, however, to verify beforehand

that the artificially made leak is big enough to increase the filter penetration by at least a factor of five

relative to the penetration of the non-leaking filter.

The mean aerosol concentrations determined at the upstream and downstream sampling points

without the filter in position shall not differ from each other by more than 5 %.

6.3 Aerosol generation and measuring instruments
6.3.1 General

The operating parameters of the aerosol generator shall be adjusted to produce a test aerosol whose

number median diameter is in the range of the MPPS for the sheet filter medium.

The median size of the mono-disperse test aerosol shall not deviate from the MPPS by more than ±10 %.

A deviation of ±50 % is allowed when using a poly-disperse aerosol.

The particle output of the aerosol generator shall be adjusted according to the test volume

...

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