SIST EN ISO 29463-5:2022
(Main)High-efficiency filters and filter media for removing particles in air - Part 5: Test method for filter elements (ISO 29463-5:2022)
High-efficiency filters and filter media for removing particles in air - Part 5: Test method for filter elements (ISO 29463-5:2022)
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.
Schwebstofffilter und Filtermedien zur Abscheidung von Partikeln aus der Luft - Teil 5: Prüfverfahren für Filterelemente (ISO 29463-5:2022)
Dieses Dokument legt die Prüfverfahren für die Bestimmung des Abscheidegrads von Filtern für die Partikelgröße im Abscheidegradminimum (MPPS) fest. Es enthält außerdem Richtlinien für die Prüfung und Klassifizierung von Filtern mit einer Partikelgröße im Abscheidegradminimum (MPPS) von weniger als 0,1 μm (Anhang B) und Filtern, die Medien mit (geladenen) synthetischen Fasern (Anhang C) nutzen. Es sollte in Verbindung mit ISO 29463 1, ISO 29463 2, ISO 29463 3 und ISO 29463 4 verwendet werden.
Filtres à haut rendement et filtres pour l'élimination des particules dans l'air - Partie 5: Méthode d'essai des éléments filtrants (ISO 29463-5:2022)
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.
Zelo učinkoviti filtri in filtrirno sredstvo za odstranjevanje delcev iz zraka - 5. del: Metoda preskušanja filtrskih elementov (ISO 29463-5:2022)
Ta dokument določa preskusne metode za ugotavljanje učinkovitosti filtrov pri velikosti delcev, ki omogoča največjo prepustnost (MPPS). Vsebuje tudi smernice za preskušanje in razvrstitev filtrov pri velikosti delcev, ki omogoča največjo prepustnost manj kot 0,1 μm (dodatek B), in filtrov s sredstvom iz (naelektrenih) sintetičnih vlaken (dodatek C). Predviden je za uporabo v povezavi s standardi ISO 29463-1, ISO 29463-2, ISO 29463-3 in ISO 29463-4.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 29463-5:2022
01-junij-2022
Nadomešča:
SIST EN ISO 29463-5:2018
Zelo učinkoviti filtri in filtrirno sredstvo za odstranjevanje delcev iz zraka - 5. del:
Metoda preskušanja filtrskih elementov (ISO 29463-5:2022)
High-efficiency filters and filter media for removing particles in air - Part 5: Test method
for filter elements (ISO 29463-5:2022)
Schwebstofffilter und Filtermedien zur Abscheidung von Partikeln aus der Luft - Teil 5:
Prüfverfahren für Filterelemente (ISO 29463-5:2022)
Filtres à haut rendement et filtres pour l'élimination des particules dans l'air - Partie 5:
Méthode d'essai des éléments filtrants (ISO 29463-5:2022)
Ta slovenski standard je istoveten z: EN ISO 29463-5:2022
ICS:
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
SIST EN ISO 29463-5:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 29463-5:2022
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SIST EN ISO 29463-5:2022
EN ISO 29463-5
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN ISO 29463-5:2018
English Version
High-efficiency filters and filter media for removing
particles in air - Part 5: Test method for filter elements
(ISO 29463-5:2022)
Filtres à haut rendement et filtres pour l'élimination Schwebstofffilter und Filtermedien zur Abscheidung
des particules dans l'air - Partie 5: Méthode d'essai des von Partikeln aus der Luft - Teil 5: Prüfverfahren für
éléments filtrants (ISO 29463-5:2022) Filterelemente (ISO 29463-5:2022)
This European Standard was approved by CEN on 18 March 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29463-5:2022 E
worldwide for CEN national Members.
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SIST EN ISO 29463-5:2022
EN ISO 29463-5:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 29463-5:2022
EN ISO 29463-5:2022 (E)
European foreword
This document (EN ISO 29463-5:2022) has been prepared by Technical Committee ISO/TC 142
"Cleaning equipment for air and other gases" in collaboration with Technical Committee CEN/TC 195
“Cleaning equipment for air and other gases” the secretariat of which is held by UNI.
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 October 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
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 ISO 29463-5:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 29463-5:2022 has been approved by CEN as EN ISO 29463-5:2022 without any
modification.
3
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SIST EN ISO 29463-5:2022
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SIST EN ISO 29463-5:2022
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
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SIST EN ISO 29463-5:2022
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
ii
© ISO 2022 – All rights reserved
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SIST EN ISO 29463-5:2022
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
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SIST EN ISO 29463-5:2022
ISO 29463-5:2022(E)
Bibliography .28
iv
© ISO 2022 – All rights reserved
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SIST EN ISO 29463-5:2022
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.
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SIST EN ISO 29463-5:2022
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.
vi
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SIST EN ISO 29463-5:2022
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/
1
© ISO 2022 – All rights reserved
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SIST EN ISO 29463-5:2022
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
N
d particle diameter, μm
p
E efficiency
k dilution factor
N particle counts
P penetration, %
p absolute pressure, Pa
T temperature, K
t sampling duration, s
3
volume flow rate, cm /s
V
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
2
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SIST EN ISO 29463-5:2022
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
M
Formula (1):
S
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.
3
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SIST EN ISO 29463-5:2022
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.
4
© ISO 2022 – All rights reser
...
SLOVENSKI STANDARD
oSIST prEN ISO 29463-5:2021
01-junij-2021
Zelo učinkoviti filtri in filtrirno sredstvo za odstranjevanje delcev iz zraka - 5. del:
Metoda preskušanja filtrskih elementov (ISO/DIS 29463-5:2021)
High-efficiency filters and filter media for removing particles in air - Part 5: Test method
for filter elements (ISO/DIS 29463-5:2021)
Schwebstofffilter und Filtermedien zur Abscheidung von Partikeln aus der Luft - Teil 5:
Prüfverfahren für Filterelemente (ISO/DIS 29463-5:2021)
Filtres à haut rendement et filtres pour l'élimination des particules dans l'air - Partie 5:
Méthode d'essai des éléments filtrants (ISO/DIS 29463-5:2021)
Ta slovenski standard je istoveten z: prEN ISO 29463-5
ICS:
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
oSIST prEN ISO 29463-5:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 29463-5:2021
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oSIST prEN ISO 29463-5:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 29463-5
ISO/TC 142 Secretariat: UNI
Voting begins on: Voting terminates on:
2021-04-20 2021-07-13
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
ICS: 91.140.30
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 29463-5:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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oSIST prEN ISO 29463-5:2021
ISO/DIS 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
ii © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 29463-5:2021
ISO/DIS 29463-5:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Efficiency test methods . 2
4.1 Reference efficiency test method . 2
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 . 3
6 Test apparatus . 4
6.1 General . 4
6.2 Test duct . 4
6.2.1 Test air conditioning . 4
6.2.2 Adjustment of the volume flow rate . 4
6.2.3 Measurement of the volume flow rate . 5
6.2.4 Aerosol mixing section . 5
6.2.5 Test filter mounting assembly . 5
6.2.6 Measuring points for the pressure drop . 5
6.2.7 Sampling. 5
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 . 6
6.3.3 Apparatus for testing with a poly-disperse test aerosol . 6
7 Conditions of the test air .10
8 Test procedure .11
8.1 Preparatory checks.11
8.2 Starting up the aerosol generator .11
8.3 Preparation of the test filter .11
8.3.1 Installation of the test filter .11
8.3.2 Flushing the test filter .11
8.4 Testing .11
8.4.1 Measuring the pressure drop .11
8.4.2 Testing with a mono-disperse test aerosol .12
8.4.3 Testing with a poly-disperse test aerosol .12
8.4.4 Testing filters with charged media .12
9 E valuation .12
10 Test report .14
11 Maintenance and inspection of the test apparatus .15
Annex A (normative) Alternate efficiency test method from scan testing .16
Annex B (informative) Testing and classification method for filters with MPPS ≤0,1 µm
(e.g. membrane medium filters) .17
Annex C (normative) Method for testing and classification of filters using media with
charged fibres .20
Annex D (informative) Traditional efficiency test methods for HEPA and ULPA filters .25
Bibliography .26
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ISO/DIS 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.
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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Introduction
ISO 29463 (all parts) is derived from EN 1822 (all parts) with extensive changes to meet the requests
from non-EU 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.
ISO 29463 (all parts) 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
ISO 29463 (all parts) 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 most penetrating particle size (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 supplier and customer. For lower-efficiency filters
(group H, as described below), alternate leak test methods described in ISO 29463-4:2011, Annex A, can
be used by specific agreement between users and suppliers, but only if the use of these other methods is
clearly designated in the filter markings as noted in ISO 29463-4:2011, Annex A.
There are differences between ISO 29463 (all parts) 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 of this part of ISO 29463.
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DRAFT INTERNATIONAL STANDARD ISO/DIS 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 part of ISO 29463 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
ISO 29464, Cleaning of air and other gases — Terminology
3 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, ISO 29464 and the following apply.
3.1
sampling duration
time during which the particles in the sampling volume flow are counted (upstream or downstream)
[SOURCE: ISO 29464:2017, 3.2.153]
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3.2
measuring procedure with fixed sampling probes
determination of the overall efficiency using fixed sampling probes upstream and downstream of the
filter being tested
[SOURCE: ISO 29464:2017, 3.2.107]
3.3
total particle count method
particle counting method in which the total number of particles in a certain sample volume is
determined without classification according to size
EXAMPLE By using a condensation particle counter.
[SOURCE: ISO 29464:2017, 3.2.164, modified – Example 2 has been deleted]
3.4
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]
3.5
particle concentration method
method that can determine the total concentration of particles in the aerosol either by multiple particle
counting or chemical concentrations
Note 1 to entry: No particle size classification can be determined by this method.
4 Efficiency test methods
4.1 Reference efficiency test method
In order to determine the efficiency of the test filter, it is fixed in the test filter mounting assembly and
subjected to a test air volume flow corresponding to the nominal volume flow rate. After measuring the
pressure drop at the nominal volume flow rate, the filter is purged with clean air and 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 differential
mobility particle sizer, 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 counting method may be used with a
condensation particle counter (CPC) or an optical particle counter (OPC; for example 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 method, e.g. an optical particle counter or
DMPS, shall be used, which, in addition to counting the particles, is also able to determine their size
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distribution. It shall be ensured that the count median diameter, D , of the test aerosol lies in the range
M
given by Equation (1):
S
MPPS
>>DS15, ⋅ (1)
MMPPS
2
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).
4.2 Alternate efficiency test method for groups H and U filters
The standard efficiency test method, as described above, 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 below 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 below.
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 part of ISO 29463; 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.
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 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.
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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.
Key
1 coarse dust filter 10 sampler, upstream
2 fine dust filter 11 ring pipe for differential pressure measurement
3 fan 12 manometer
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
7 temperature measurement 16 manometer measuring differential pressure
8 hygrometer 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 be comprised of the equipment required to control the
condition of the test air so that it can be brought in compliance 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.
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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, 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
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, partial flows 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 duct at the given volume flow rate for the sample. 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 a
...
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