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 2022
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Published in Switzerland
ii
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
Bibliography .28
iv
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
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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.
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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.
v
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 refe
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