EN ISO 13351:2024

SLOVENSKI STANDARD
01-november-2024
Industrijski ventilatorji - Mere (ISO 13351:2024)
Fans - Dimensions (ISO 13351:2024)
Ventilatoren - Abmessungen (ISO 13351:2024)
Ventilateurs - Dimensions (ISO 13351:2024)
Ta slovenski standard je istoveten z: EN ISO 13351:2024
ICS:
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13351
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2024
EUROPÄISCHE NORM
ICS 23.120 Supersedes EN ISO 13351:2009
English Version
Fans - Dimensions (ISO 13351:2024)
Ventilateurs - Dimensions (ISO 13351:2024) Ventilatoren - Abmessungen (ISO 13351:2024)
This European Standard was approved by CEN on 25 August 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13351:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13351:2024) has been prepared by Technical Committee ISO/TC 117 "Fans" in
collaboration with Technical Committee CEN/TC 156 “Ventilation for buildings” the secretariat of which
is held by BSI.
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 March 2025, and conflicting national standards shall
be withdrawn at the latest by March 2025.
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 13351:2009.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 13351:2024 has been approved by CEN as EN ISO 13351:2024 without any modification.

International
Standard
ISO 13351
Third edition
Fans — Dimensions
2024-08
Ventilateurs — Dimensions
Reference number
ISO 13351:2024(en) © ISO 2024
ISO 13351:2024(en)
© ISO 2024
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 13351:2024(en)
Contents Page
Foreword .iv
Introduction .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 Requirements . 4
4.1 General .4
4.2 Circular flanges .4
4.3 Rectangular flanges .7
4.4 Designation of fan size . 12
Bibliography . 14

iii
ISO 13351:2024(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 117, Fans, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 156, Ventilation for buildings, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 13351:2009), which has been technically
revised.
The main changes are as follows:
— added to the sizes of the heavy-duty fans in Table 3;
— aligned definitions and symbols to ISO 13349-1;
— clarified Figure 3 for mixed flow fan.
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 13351:2024(en)
Introduction
This document gives dimensional details of circular and rectangular flanges of fans in addition to specifying
1)
the fan size designation. For circular flanges, the values specified in ISO 6580 have been retained for light-
duty fans, in parallel with those values given in Tables 3 and 4 for medium- and heavy-duty fans.
While it does not constrain the manufacturer's choice of flange details, this document facilitates
interchangeability, thereby helping reduce technical barriers to trade.
Throughout this document, the principal dimensions are based on the rounded values of preferred numbers
given in ISO 497.
1) Cancelled and replaced by ISO 13351.

v
International Standard ISO 13351:2024(en)
Fans — Dimensions
1 Scope
This document specifies the dimensions of the circular and rectangular flanges of general-purpose fans, as
well as the fan size designations. It is not applicable to cross-flow fans or to fan appliances used for individual
household or similar applications.
For circular flanges, it provides for three different flange series: one for light-duty casing thicknesses,
another for medium-duty fans and the third for heavy-duty fans as used on sea-going vessels or in heavy
industry.
In order not to restrict fan design unduly, only the pitch diameter, hole numbers and hole diameters are
specified. Flange thickness, as well as internal and external flange diameters, can be chosen freely within
the limits of good engineering practice.
2 Normative references
The following referenced documents are indispensable for the application 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 3, Preferred numbers — Series of preferred numbers
ISO 13349-1, Fans — Vocabulary and definitions of categories — Part 1: Vocabulary
ISO 13349-2, Fans — Vocabulary and definitions of categories — Part 2: Categories
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 13349-1, ISO 13349-2 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/
3.1 Terms and definitions
3.1.1
light‑duty fan
fan suitable for air that is non-toxic, not saturated, non-corrosive, non-flammable, free from abrasive
particles, and not exceeding a temperature of 80 °C, or 40 °C if the motor or the fan bearings are in the air
stream, and for pressures up to 2 kPa
Note 1 to entry: See Table 1.
ISO 13351:2024(en)
3.1.2
medium‑duty fan
fan designed for pressures up to 10 kPa
Note 1 to entry: Applications that require a robust design can be referred to as "medium duty", such as in marine
applications.
3.1.3
heavy‑duty fan
fan desi
...