Fans - Vocabulary and definitions of categories - Part 2: Categories (ISO 13349-2:2022)

This document defines categories in the field of fans used for all purposes.
It is not applicable to electrical safety.

Ventilateurs - Vocabulaire et définitions des catégories - Partie 2: Catégories (ISO 13349-2:2022)

Le présent document définit les catégories dans le domaine des ventilateurs destinés à tous les usages.
Le présent document ne s’applique pas à la sécurité électrique.

Ventilatorji - Slovar in definicije kategorij - 2. del: Kategorije (ISO 13349-2:2022)

General Information

Status
Published
Publication Date
14-Nov-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Oct-2022
Due Date
02-Jan-2023
Completion Date
15-Nov-2022

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SLOVENSKI STANDARD
SIST EN ISO 13349-2:2022
01-december-2022
Nadomešča:
SIST EN ISO 13349:2010

Ventilatorji - Slovar in definicije kategorij - 2. del: Kategorije (ISO 13349-2:2022)

Fans - Vocabulary and definitions of categories - Part 2: Categories (ISO 13349-2:2022)

Ventilateurs - Vocabulaire et définitions des catégories - Partie 2: Catégories (ISO 13349

-2:2022)
Ta slovenski standard je istoveten z: EN ISO 13349-2:2022
ICS:
01.040.23 Tekočinski sistemi in sestavni Fluid systems and
deli za splošno rabo (Slovarji) components for general use
(Vocabularies)
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
SIST EN ISO 13349-2:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13349-2:2022
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SIST EN ISO 13349-2:2022
EN ISO 13349-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 01.040.23; 23.120 Supersedes EN ISO 13349:2010
English Version
Fans - Vocabulary and definitions of categories - Part 2:
Categories (ISO 13349-2:2022)
Ventilateurs - Vocabulaire et définitions des catégories
- Partie 2: Catégories (ISO 13349-2:2022)
This European Standard was approved by CEN on 4 September 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13349-2:2022 E

worldwide for CEN national Members.
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SIST EN ISO 13349-2:2022
EN ISO 13349-2:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 13349-2:2022
EN ISO 13349-2:2022 (E)
European foreword

This document (EN ISO 13349-2:2022) 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 April 2023, and conflicting national standards shall be

withdrawn at the latest by April 2023.

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 13349:2010.

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 13349-2:2022 has been approved by CEN as EN ISO 13349-2:2022 without any

modification.
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SIST EN ISO 13349-2:2022
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SIST EN ISO 13349-2:2022
INTERNATIONAL ISO
STANDARD 13349-2
First edition
2022-09
Fans — Vocabulary and definitions of
categories —
Part 2:
Categories
Ventilateurs — Vocabulaire et définitions des catégories —
Partie 2: Catégories
Reference number
ISO 13349-2:2022(E)
© ISO 2022
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
Contents  Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 S c op e ................................................................................................................................................................................................................................. 1

2  N ormative references ..................................................................................................................................................................................... 1

3  T erms and definitions .................................................................................................................................................................................... 1

4  S ymbols and units............................................................................................................................................................................................... 1

4.1 Symbols ......................................................................................................................................................................................................... 1

4.2 M ultiples of primary units ........................................................................................................................................................... 2

4.3 U nits of time .............................................................................................................................................................................................. 2

4.4 T emperature of air or gas.............................................................................................................................................................. 2

5  F an categories ......................................................................................................................................................................................................... 2

5.1 G eneral ........................................................................................................................................................................................................... 2

5.2 S uitability for the fan pressure ................................................................................................................................................ 3

5.2.1 G eneral ........................................................................................................................................................................................ 3

5.2.2 W ork per unit mass .......................................................................................................................................................... 3

5 . 2 . 3 Fa n c at e g or ie s ....................................................................................................................................................................... 3

5.2.4 C hanges in air density ................................................................................................................................................... 3

5.3 S uitability of construction ........................................................................................................................................................... 4

5.3.1 Categorization according to casing construction ................................................................................. 4

5.3.2 D esignation for hot-gas fan ....................................................................................................................................... 4

5.3.3 Designation and recommended categorization for smoke-ventilating fans ................. 5

5.3.4 C ategorization for gas-tight fans ......................................................................................................................... 5

5 .4 Tr a n s m i s s ion a r r a n g ement s ...................................................................................................................................................... 5

5.5 I nlet and outlet conditions ........................................................................................................................................................... 9

5.6 M ethod of fan control .................................................................................................................................................................... 10

5.7 D esignation of direction of rotation and position of parts of the fan assembly ........................ 10

5.7.1 General ..................................................................................................................................................................................... 10

5.7.2 D irection of rotation .................................................................................................................................................... 10

5.7.3 O utlet position of a centrifugal fan .................................................................................................................12

5.7.4 Position of component parts of a centrifugal fan with volute casing ...............................13

5.7.5 P osition of component parts of an axial-flow, mixed-flow or other fan with

coaxial inlet and outlet ..............................................................................................................................................13

5.7.6 P osition of motor or other prime movers .................................................................................................. 14

5.8 C haracteristic dimensions and component parts ................................................................................................ 16

5 . 8 .1 C h a r ac t er i s t ic d i men s ion s ...................................................................................................................................... 16

5.8.2 Terms for fan component parts .......................................................................................................................... 16

Annex A (informative) Examples ..........................................................................................................................................................................24

Bibliography .............................................................................................................................................................................................................................26

iii
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(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 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 document, along with ISO 13349-1, cancels and replaces ISO 13349:2010, which has been

technically revised.
The main changes are as follows:
— document split into two parts: Vocabulary and Categories;
— Clause 3 revised to refer to ISO 13349-1;
— positions of the illustrations modified;
— editorial errors corrected.
A list of all parts in the ISO 13349 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.
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
Introduction

This document reflects the importance of a standardized approach to the terminology of fans.

The need for an International Standard has been evident for some considerable time. To take just one

example, the coding of driving arrangements differs from manufacturer to manufacturer. What one

currently calls arrangement no. 1 can be known by another as arrangement no. 3. The confusion for the

customer is only too apparent. For similar reasons, it is essential to use standardized nomenclature to

identify particular parts of a fan.

Wherever possible, in the interests of international comprehension, this document is in agreement with

similar documents produced by Eurovent, AMCA, VDMA (Germany), AFNOR (France) and UNI (Italy).

They have, however, been built on where the need for amplification was apparent.

Use of this document will lead to greater understanding among all parts of the air-moving industry.

This document is intended for use by manufacturers, consultants and contractors.
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
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SIST EN ISO 13349-2:2022
INTERNATIONAL STANDARD ISO 13349-2:2022(E)
Fans — Vocabulary and definitions of categories —
Part 2:
Categories
1 S cope
This document defines categories in the field of fans used for all purposes.
It is not applicable to electrical safety.
2  Normat  ive 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 5801, Fans — Performance testing using standardized airways

ISO 13349-1, Fans — Vocabulary and definitions of categories —Part 1:Fans—Vocabulary

ISO 13351, Fans — Dimensions
3  T erms and definitions

For the purposes of this document, the terms and definitions given in ISO 5167-1, ISO 5801 and

ISO 13349-1 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/
4  S ymbols and units
4.1 Symbols
The following symbols and primary units for the parameters listed apply.
Parameter Symbol Unit
Volume flow rate q m /s
Fan pressure p Pa
Power P W
Torque τ Nm
NOTE 1 For sound units, see ISO 13347-1.
NOTE 2 For efficiency units, see ISO 5801.
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
Parameter Symbol Unit
Gas density ρ kg/m
Impeller tip speed u m/s
Outlet or duct velocity v m/s
Rotational frequency n r/s
Rotational speed N r/min
Dimensions — mm
Moment of inertia I kg·m
Stress σ Pa
Energy E J
Temperature Θ K
Temperature Τ °C
Work per unit mass W J/kg
Thrust (calculated, measured) T , T N
c m
NOTE 1 For sound units, see ISO 13347-1.
NOTE 2 For efficiency units, see ISO 5801.
4.2  Multiples   of primary units

The choice of the appropriate multiple or submultiple of an SI unit is governed by convenience. The

multiple chosen for a particular application shall be that which leads to numerical values within a

practical range (e.g. kilopascal for pressure, kilowatt for power and megapascal for stress).

4.3  Units   of time

The second is the SI base unit of time, although outside SI the minute has been recognized by the

International Committee for Weights and Measures (CIPM) as necessary to be retained for use because

of its practical importance. Manufacturers may, therefore, continue with the use of r/min (“r” stands for

revolutions) for rotational speed.
4.4  T emperature of air or gas

The kelvin is the SI base unit of thermodynamic temperature and is preferred for most scientific and

technological purposes. The degree Celsius (°C) is acceptable for practical applications.

5  F an categories
5.1 General
Fans may be categorized according to:
a) suitability for the fan pressure;

b) suitability of construction (including features required for smoke ventilation, gas tightness and

ignition protection);
c) driving arrangement;
d) inlet and outlet conditions;
e) method of fan control;
f) rotation and position of parts;
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
g) characteristic dimensions.

Examples of the use of the definitions and categories to identify a fan in a specification are given in

Annex A.
5.2  Suitability   for the fan pressure
5.2.1 General

A fan may also be defined as being low-, medium- or high-pressure, according to the level of flow work

per unit mass and whether the influence of compressibility of the air or gas being handled has to be

taken into account. For a detailed account of these considerations, see ISO 5801.

A low-pressure fan is then defined as having a pressure ratio less than 1,02. This corresponds to a

pressure rise of less than 2 kPa when handling standard air.

A medium-pressure fan is defined as having a pressure ratio greater than 1,02 and less than 1,1. The

reference Mach number shall be less than 0,15. This corresponds to a pressure rise of 2 kPa to 10 kPa.

A high-pressure fan is defined as having a pressure ratio equal to or greater than 1,1 and a pressure

rise greater than 10 kPa.
5.2.2   Work per unit mass

A convention is used for all industrial fans except jet fans (see ISO 13350), denoting the work per unit

mass as the quotient of air power and mass flow rate. The fan pressure is approximately equal to the

product of work per unit mass and the mean stagnation density of the fluid within the fan.

5.2.3   Fan categories

Depending on, for example, its peripheral speed, impeller and casing design, a fan impeller develops

more or less pressure. This document defines a range of “fan categories” where the fan pressure at

maximum efficiency and maximum rotational speed is not less than the value given in Table 1. In any

event, this defined fan pressure (as shown in Table 1) shall not exceed 95 % of the maximum pressure

developed by the fan at its maximum speed.
5.2.4   Changes in air density

These categories shall also be used to indicate whether or not the change in air density within the fan

shall be considered. For a low-pressure fan, this change may be neglected. For a high-pressure fan,

this change shall not be neglected, whereas for a medium-pressure fan, it may be neglected depending

on the desired accuracy. Detailed mechanical design and construction of the rotational elements are

determined by the peripheral speed and, therefore, the pressure for which the fan is specified. For

examples of centrifugal fans, see ISO 13349-1:2022, Figure 14.

Table 1 — Categorization of fan according to fan pressure at maximum safe rotational speed

Maximum fan pressure, p
Fan description Code (for standard air) Category
kPa
Low pressure L 0 < p ≤ 0,7 0
0,7 < p ≤ 1 1
1 < p ≤ 1,6 2
1,6 < p ≤ 2,0 3
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Maximum fan pressure, p
Fan description Code (for standard air) Category
kPa
Medium pressure M 2,0 < p ≤ 3,6 4
3,6 < p ≤ 6,3 5
6,3 < p ≤ 10 6
High pressure H 10 < p ≤ 16 7
16,0 < p ≤ 22,4 8
22,4 < p ≤ 30 9
5.3  Suitability   of construction
5.3.1   Categorization according to casing construction

Fans are used for a variety of purposes. The air or gas handled can be clean or contain moisture or

solid particles and may be at ambient or other temperature. Connection to its associated ducting can be

via flexible elements or alternatively it can be attached directly, such that the casing has to withstand

additional loads due to the dead weight of these connections. Where a high or low temperature is

present, further loading can result from the effects of expansion or contraction. Casing thickness and

stiffening are also determined by the ability to withstand the specified fan pressure and dynamic loads

and by the need for a margin to counter the effects of any erosion or corrosion. For all these and other

reasons, different methods of casing construction and different casing thicknesses are appropriate to

the application.

The categorization in Table 2 reflects current practice and shall be used only to assist specification. It

in no way indicates any form of grading. Category 1 is as valid for clean air ventilation as category 3 is

preferred for heavy industrial requirements.
Table 2 — Categorization of fans according to method of casing construction
Casing thick-
Category Typical casing features Usage
ness
1 Lockformed, spot welded or screwed con- — Light HVAC clean air < 0,002 5D
struction. Cradle or angle frame mounting.
2 Lockformed, seam welded or continuously — Heavy HVAC > 0,002 5D
welded construction. Semi-universal design
— Light industrial
with bolted-on side-plates.
— Light dust or moisture
3 Fully welded fixed discharge. — Heavy industrial > 0,003 33D
— Dirty air containing moisture
or solids
— High pressure
— High power
Key
D nominal impeller diameter, in millimetres
5.3.2   Designation for hot-gas fan

Where a fan is suitable for continuous operation up to a stated maximum temperature this should be

indicated on the conventional fan rating plate itself.
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)

The designation that shall be used is: T, followed by the maximum temperature in degrees Celsius (°C),

for continuous operation.

EXAMPLE T/500 denotes a fan rated for a maximum continuous temperature of 500 °C.

5.3.3   Designation and recommended categorization for smoke-ventilating fans

If the fan is also, or only, capable of short-term operation at a high temperature, this information shall

be clearly stated on a separate label.
5.3.4   Categorization for gas-tight fans

Gas-tight fans shall be categorized in accordance with Table 3. The amount of leakage is dependent

on the pressure within the fan casing and the time for which this must be maintained. The leakage

rate is obtained by blocking off the fan inlet and outlet and “pumping up” or extracting the casing

using an auxiliary test fan. The change in the test pressure shall be measured by a manometer as a

function of time. The leakage rate is then determined from the flow of the auxiliary test fan or other

pressure sources. This leakage shall be less than the value calculated from the formula appropriate to

the category.

Normally, the fan is stationary during this test. However, if the correct functioning of the shaft seal is

dependent on fan rotation, the test shall be carried out with the impeller removed and the remainder of

the fan running.

Categories A to D match the established classes of allowable ductwork leakage rate used in the air-

conditioning industry. Category E is often specified for systems handling toxic fumes, while categories F

and G relate to nuclear and defence equipment specifications, respectively.

Table 3 — Categorization of gas-tight fans — Leakage as a function of test pressure

Maximum test pres- Time at maximum
Acceptance criteria/maximum leak-
sure pressure
Leakage category
age rate
kPa min
0,65
A 0,5 15 0,027 × p
0,65
B 1 15 0,009 × p
0,65
C 2 15 0,003 × p
0,65
D 2,5 15 0,001 × p
0,65
E 2,5 15 0,000 5 × p
F 3 60 Fall in p < 500 Pa
G 10,5 15 No detectable leaks
H1 1,5 60 Fall in p < 150 Pa
H2 1,5 60 Fall in p < 15 Pa

NOTE 1 Leakage rates in categories A, B, C, D and E are in litres per second per square metre of casing wetted area and p is

the test pressure in pascals.

NOTE 2 Leakage is defined as loss of pressure in categories F, H1 and H2. Especially when measuring the pressure loss

according to leakage categories H1 or H2, attention is drawn to changes of the gas temperature inside the casing or the

ambient pressure during measurement as they can taint the result significantly.
5.4  T ransmission arrangements
The six most commonly used types of transmission are:

a) Direct transmission from the shaft of the motor or other prime mover: the impeller is fixed to the

shaft extension.
© ISO 2022 – All rights reserved
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SIST EN ISO 13349-2:2022
ISO 13349-2:2022(E)

b) Transmission through an in-line direct coupling: the transmission shaft and the impeller shaft are

each fixed on a part of the in-line direct coupling and rotate at the same speed.

c) Transmission through an in-line slipping coupling: the transmission shaft is fixed to the primary

part of the coupling and the impeller shaft to the secondary part of the coupling, enabling them to

rotate at different speeds, the relative difference of which (i.e. the slip) depends upon the speed, the

torque to be transmitted and, when appropriate, the degree of control applied to the coupling.

d) Transmission through a gearbox: the transmission shaft and the impeller shaft are not necessarily

coaxial; they may be parallel or at an angle, their speeds being in one or more given ratio(s).

e) Belt transmission: the transmission shaft and the impeller shaft are not in-line but parallel, the

transmission between the two being by means of flat, toothed or vee belts (or belts of some other

section) and su
...

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