ISO 5011
(Main)Inlet air cleaning equipment for internal combustion engines and compressors — Performance testing
Inlet air cleaning equipment for internal combustion engines and compressors — Performance testing
This document establishes and specifies uniform test procedures, conditions, equipment and a performance report to permit the direct laboratory performance comparison of air cleaners. The basic performance characteristics of greatest interest are air flow restriction or differential pressure, dust collection efficiency, dust capacity and oil carry-over on oil bath air cleaners. This test code therefore deals with the measurement of these parameters. This document is applicable to air cleaners used on internal combustion engines and compressors generally used in automotive and industrial applications.
Séparateurs aérauliques placés à l'entrée des moteurs à combustion interne et des compresseurs — Détermination des performances
General Information
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Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/FDIS 5011
ISO/TC 22/SC 34
Inlet air cleaning equipment for
Secretariat: JISC
internal combustion engines and
Voting begins on:
compressors — Performance
2025-06-03
testing
Voting terminates on:
2025-07-29
Séparateurs aérauliques placés à l'entrée des moteurs à
combustion interne et des compresseurs — Détermination des
performances
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
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
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.
Reference number
ISO/FDIS 5011:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 5011:2025(en)
International
Standard
ISO/FDIS 5011
ISO/TC 22/SC 34
Inlet air cleaning equipment for
Secretariat: JISC
internal combustion engines and
Voting begins on:
compressors — Performance testing
Séparateurs aérauliques placés à l'entrée des moteurs à
Voting terminates on:
combustion interne et des compresseurs — Détermination des
performances
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.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/FDIS 5011:2025(en) © ISO 2025
ii
ISO/FDIS 5011:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions .1
3.2 Symbols .3
4 Measurement accuracy and standard conditions . 4
4.1 Measurement accuracy and precision .4
4.2 Standard conditions .4
5 Test materials and test conditions . 4
5.1 Test dust .4
5.1.1 Grade .4
5.1.2 Preparation .5
5.2 Test oil for oil bath air cleaners .5
5.3 Absolute filter materials .5
5.3.1 Filter media .5
5.3.2 Validation of absolute filter media efficiency, E .5
a
5.4 Absolute filter mass .6
5.4.1 Validation of the absolute filter weighing method .6
5.5 Temperature and humidity .6
6 Test procedure for dry-type single-stage air cleaners . 6
6.1 General .6
6.2 Test equipment .6
6.3 Restriction and differential pressure test .8
6.4 Efficiency test .8
6.4.1 Purpose .8
6.4.2 Types .8
6.4.3 Test procedure — Absolute filter method .9
6.4.4 Test procedure — Direct weighing method .10
6.5 Capacity test .10
6.6 Filter element pressure collapse test . . .11
6.7 Variable air flow test .11
6.8 Presentation of data . . 12
7 Test procedure for dry-type multistage air cleaners .12
7.1 General . 12
7.2 Test equipment . 12
7.3 Restriction and differential pressure test . 13
7.4 Initial efficiency test procedure — Absolute filter method . 13
7.5 Full-life efficiency and capacity test . .14
7.5.1 Air cleaner dust capacity.14
7.5.2 Test procedure — Absolute filter method .14
7.5.3 Test procedure — Direct weighing method . 15
7.6 Presentation of data .16
7.7 Variations for scavenged air flow performance testing .16
7.7.1 General .16
7.7.2 Additional equipment .16
7.7.3 Restriction and differential pressure test .17
7.7.4 Full-life efficiency and capacity test .17
7.7.5 Presentation of data .17
7.8 Precleaner performance test .17
7.8.1 Precleaner dust removal .17
7.8.2 Precleaner efficiency .18
7.8.3 Presentation of data .18
iii
ISO/FDIS 5011:2025(en)
7.9 Secondary element test procedure .18
7.9.1 General .18
7.9.2 Specific efficiency test .18
7.9.3 Expression of results .19
8 Test procedure for oil bath air cleaners . 19
8.1 General .19
8.2 Test equipment and conditions .19
8.3 Restriction and differential pressure test . 20
8.4 Oil carry-over test. 20
8.5 Full life efficiency and capacity test .
...
ISO/DIS FDIS 5011:2024(en)
ISO/TC 22/SC 34/WG 3
Secretariat: ANSI JISC
Date: 2024-072025-05-20
Inlet air cleaning equipment for internal combustion engines and
compressors — Performance testing
Séparateurs aérauliques placés à l'entrée des moteurs à combustion interne et des compresseurs —
Détermination des performances
FDIS stage
ISO/FDIS 5011:2020(E2025(en)
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
and microfilm, or posting on the internet or an intranet, without prior written permission in writing. Permission can be
requested from either ISO at the address below or ISO'sISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CP 401 • Ch. de Blandonnet 8
CH-12111214 Vernier, Geneva 20
Tel.Phone: + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail: copyright@iso.org
WebWebsite: www.iso.chorg
PrintedPublished in Switzerland
ii © ISO 2020 – All rights reserved
ii
ISO/DIS FDIS 5011:20242025(en)
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.2 Symbols . 4
4 Measurement accuracy and standard conditions . 4
4.1 Measurement accuracy and precision . 4
4.2 Standard conditions . 5
5 Test materials and test conditions . 5
5.1 Test dust . 5
5.2 Test oil for oil bath air cleaners . 5
5.3 Absolute filter materials . 6
5.4 Absolute filter mass . 6
5.5 Temperature and humidity . 7
6 Test procedure for dry-type single-stage air cleaners . 7
6.1 General. 7
6.2 Test equipment . 7
6.3 Restriction and differential pressure test . 9
6.4 Efficiency test . 9
6.5 Capacity test . 11
6.6 Filter element pressure collapse test . 12
6.7 Variable air flow test . 12
6.8 Presentation of data . 13
7 Test procedure for dry-type multistage air cleaners . 13
7.1 General. 13
7.2 Test equipment . 13
7.3 Restriction and differential pressure test . 14
7.4 Initial efficiency test procedure — Absolute filter method . 14
7.5 Full-life efficiency and capacity test . 15
7.6 Presentation of data . 17
7.7 Variations for scavenged air flow performance testing . 17
7.8 Precleaner performance test . 19
7.9 Secondary element test procedure. 19
8 Test procedure for oil bath air cleaners . 20
8.1 General. 20
8.2 Test equipment and conditions . 20
8.3 Restriction and differential pressure test . 21
8.4 Oil carry-over test . 21
8.5 Full life efficiency and capacity test . 22
8.6 Recovery test . 22
8.7 Presentation of data . 22
Annex A (normative) Explanation of restriction, differential pressure and pressure loss of an
air cleaner . 23
Annex B (normative) Test equipment . 25
Annex C (informative) Report sheet on performance testing of air cleaner equipment according
to ISO 5011 — Automotive application . 43
iii
ISO/FDIS 5011:2020(E2025(en)
Annex D (informative) Report sheet on performance testing of air cleaner equipment according
to ISO 5011 — Industrial application . 45
Annex E (informative) Presentation of results — Air cleaner restriction/differential pressure
versus flow . 47
Annex F (informative) Presentation of results — Air cleaner capacity. 50
Annex G (normative) Airflow and resistance corrections to standard conditions . 53
Annex H (normative) Penetration sensitivity . 55
Bibliography . 63
iv © ISO 2020 – All rights reserved
iv
ISO/DIS FDIS 5011:20242025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This fifth edition cancels and replaces the fourth edition (ISO 5011:2020), which has been technically revised.
The main changes are as follows:
— Capacitycapacity of UUT is no longer dependent on scavenge flow rate;
— Use of “air cleaner” used instead of “air filter” where warranted;
— Editededited list of symbols to meet ISO specifications;
- significant editorial modifications to Annex HSignificant edits to Annex H to improve accuracy and
ease of understanding as well as meeting ISO specifications for use of impersonal tone
— .
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
DRAFT International Standard ISO/DIS 5011:2020(en)
Inlet air cleaning equipment for internal combustion engines and
compressors — Performance testing
1 Scope
This document establishes and specifies uniform test procedures, conditions, equipment and a performance
report to permit the direct laboratory performance comparison of air cleaners.
The basic performance characteristics of greatest interest are air flow restriction or differential pressure, dust
collection efficiency, dust capacity and oil carry-over on oil bath air cleaners. This test code therefore deals
with the measurement of these parameters.
This document is applicable to air cleaners used on internal combustion engines and compressors generally
used in automotive and industrial applications.
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 12103--1, Road vehicles — Test contaminants for filter evaluation — Part 1: Arizona test dust
3 Terms, definitions and symbols
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminologicalterminology 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/
3.1 Terms and definitions
3.1.1 3.1.1
air cleaner
device which removes particles suspended in the intake air as it is drawn into the engine
3.1.2 3.1.2
filter element
replaceable part of the air cleaner (3.1.1(3.1.1),)
...
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