prEN ISO 29463-5

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)

Dieser Teil der ISO 29463 spezifiziert die Prüfverfahren für die Bestimmung des Abscheidegrads von Filtern für die Partikelgröße im Abscheidegradminimum (MPPS). Er 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. Er 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/DIS 29463-5:2021)

Zelo učinkoviti filtri in filtrirno sredstvo za odstranjevanje delcev iz zraka - 5. del: Metoda preskušanja filtrskih elementov (ISO/DIS 29463-5:2021)

General Information

• Status: Not Published
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 195 - Air filters for general air cleaning
• Drafting Committee: CEN/TC 195/WG 2 - HEPA and ULPA filters
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 29-Oct-2021
• Completion Date: 29-Oct-2021
• Ref Project: oSIST prEN ISO 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)

RELATIONS

• Revised: EN ISO 29463-5:2018 - High-efficiency filters and filter media for removing particles in air - Part 5: Test method for filter elements (ISO 29463-5:2011)
• Effective Date: 15-May-2019

Standards Content (sample)

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.

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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

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Published in Switzerland
ii © ISO 2021 – All rights reserved
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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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oSIST prEN ISO 29463-5:2021
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.
iv © ISO 2021 – All rights reserved
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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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oSIST prEN ISO 29463-5:2021
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

given by Equation (1):
MPPS
>>DS15, ⋅ (1)
MMPPS
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
...