EN ISO 13351:2009

SLOVENSKI STANDARD
01-april-2010
1DGRPHãþD
SIST EN ISO 13351:2009
Industrijski ventilatorji - Mere (ISO 13351:2009)
Fans - Dimensions (ISO 13351:2009)
Einführendes Element - Haupt-Element - Ergänzendes Element (ISO 13351:2009)
Ventilateurs - Dimensions (ISO 13351:2009)
Ta slovenski standard je istoveten z: EN ISO 13351:2009
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13351
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2009
ICS 23.120 Supersedes EN ISO 13351:2008
English Version
Fans - Dimensions (ISO 13351:2009)
Ventilateurs - Dimensions (ISO 13351:2009)
This European Standard was approved by CEN on 3 November 2009.

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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13351:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 13351:2009) 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 May 2010, and conflicting national standards shall be withdrawn at the
latest by May 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 13351:2008.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 13351:2009 has been approved by CEN as a EN ISO 13351:2009 without any modification.

INTERNATIONAL ISO
STANDARD 13351
Second edition
2009-11-15
Fans — Dimensions
Ventilateurs — Dimensions
Reference number
ISO 13351:2009(E)
©
ISO 2009
ISO 13351:2009(E)
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ii © ISO 2009 – All rights reserved

ISO 13351:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 1
4 Requirements . 3
4.1 General. 3
4.2 Circular flanges. 4
4.3 Rectangular flanges. 7
4.4 Designation of fan size. 12
Bibliography . 13

ISO 13351:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 13351 was prepared by Technical Committee ISO/TC 117, Fans.
This second edition cancels and replaces the first edition (ISO 13351:1996), of which it constitutes a minor
revision. It also incorporates the content of ISO 6580:2005, which will be withdrawn following its publication.
iv © ISO 2009 – All rights reserved

ISO 13351:2009(E)
Introduction
This International Standard gives dimensional details of circular and rectangular flanges of fans in addition to
specifying 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 International Standard facilitates
interchangeability, thereby helping to reduce technical barriers to trade.
Throughout this International Standard, the principal dimensions are based on the rounded values of preferred
numbers given in ISO 497.
INTERNATIONAL STANDARD ISO 13351:2009(E)

Fans — Dimensions
1 Scope
This International Standard 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, may 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, Industrial fans — Vocabulary and definitions of categories
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 13349 and the following terms,
definitions and symbols apply.
3.1
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 See Table 1.
3.2
medium-duty fan
fan with flange dimensions as specified in Figure 4 and Table 2 and suitable for pressures up to 10 kPa
3.3
heavy-duty fan
fan with larger flange dimensions as specified in Figure 4 and Table 3 and suitable for pressures up to 40 kPa
ISO 13351:2009(E)
3.4
nominal impeller tip diameter
D
diameter of the impeller tip on which the design of the fan is based
NOTE See Figures 1 to 3.
D nominal impeller tip diameter, in millimetres (see Figures 1 to 3)
D actual impeller tip diameter, in millimetres (see Figures 1 to 3)
R
d pitch circle diameter, in millimetres
d hole diameter, in millimetres
d bolt diameter, in millimetres
d washer diameter, in millimetres
e casing thickness, in millimetres
g hole offset, in millimetres
l arc length between bolt holes, in millimetres
N number of holes
P pitch
α angle between bolt holes, in degrees

Figure 1 — Impeller — Centrifugal fan
2 © ISO 2009 – All rights reserved

ISO 13351:2009(E)
Figure 2 — Impeller — Axial-flow fan

a
Usually, D = D
R
Figure 3 — Impeller — Mixed-flow fan
4 Requirements
4.1 General
This International Standard adopts the Renard R 20 series according to ISO 497 as the nominal dimensions
for impeller tip diameters, the inside diameters of circular flanges and the inside lengths of the sides of
rectangular flanges. It takes into account the maximum casing thicknesses likely to be used for
general-purpose fans, as well as typical manufacturing tolerances representative of engineering “good
practice”.
The smallest practical pitch circle diameter can be related to the inside diameter of the casing, the casing
thickness, the size of the weld fillet or bend radius at the junction of the flange and the casing, and the normal
washer diameter. Light-duty circular flanges might not be suitable for the use of open-ended spanners in all
cases.
ISO 13351:2009(E)
This International Standard accepts that the number and diameter of bolts or screws cannot be established on
a theoretical basis. Practical experience of satisfactory service, optimum cost of installation and manufacture,
as well as dimensional tolerances of production are the most important considerations.
The dimensions of circular and rectangular flanges are given in sizes corresponding to nominal diameters
from 100 mm to 2 000 mm. In the smaller sizes (below about 20
...