ISO 13347-1
(Main)Fans — Determination of fan sound power levels under standardized laboratory conditions — Part 1: General overview
Fans — Determination of fan sound power levels under standardized laboratory conditions — Part 1: General overview
ISO 13347:2004 deals with the determination of the acoustic performance of industrial fans. In addition, it may be used to determine the acoustic performance of fans combined with an ancillary device such as a roof cowl or damper or, where the fan is fitted with a silencer, the sound power resulting from the fan and silencer combination.
Ventilateurs — Détermination des niveaux de puissance acoustique des ventilateurs dans des conditions de laboratoire standardisées — Partie 1: Présentation générale
L'ISO 13347-1:2004 est applicable à la détermination des performances acoustiques des ventilateurs industriels et peut également être utilisée pour déterminer les performances acoustiques des ventilateurs combinés à un appareil dépendant tel qu'un capotage ou un registre ou, lorsque le ventilateur est équipé d'un silencieux, la puissance acoustique issue de la combinaison ventilateur/silencieux.
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International
Standard
ISO/FDIS 13347-1
ISO/TC 117
Fans — Determination of fan sound
Secretariat: BSI
power levels under standardized
Voting begins on:
laboratory conditions —
2025-05-08
Part 1:
Voting terminates on:
2025-07-03
General overview
Ventilateurs — Détermination des niveaux de puissance
acoustique des ventilateurs dans des conditions de laboratoire
normalisées —
Partie 1: Présentation générale
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Reference number
ISO/FDIS 13347-1:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 13347-1:2025(en)
International
Standard
ISO/FDIS 13347-1
ISO/TC 117
Fans — Determination of fan sound
Secretariat: BSI
power levels under standardized
Voting begins on:
laboratory conditions —
Part 1:
Voting terminates on:
General overview
Ventilateurs — Détermination des niveaux de puissance
acoustique des ventilateurs dans des conditions de laboratoire
normalisées —
Partie 1: Présentation générale
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
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 13347-1:2025(en) © ISO 2025
ii
ISO/FDIS 13347-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 2
3.1 Terms and definitions .2
3.2 Symbols — fan sound power levels .4
3.3 Other symbols .5
4 Limitations on use . 6
5 Measurement uncertainty . 7
6 Instrumentation . 9
6.1 Microphone .9
6.1.1 Microphone cable .9
6.1.2 Sound level meter or other microphone amplifier .9
6.2 Frequency analyser .9
6.3 Turbulence screens and windshields .9
6.3.1 Windshields .9
6.3.2 Sampling tube .10
6.3.3 Wind-generated false noise .10
6.4 Reference sound source (RSS) . .10
7 Test methods . 10
7.1 General .10
7.2 Special considerations .10
8 Fan installation conditions .11
8.1 General .11
8.2 Reverberant room test method . 12
8.3 Enveloping surface test method . 12
8.4 Sound intensity method . 12
8.5 In-duct test method . 12
8.6 Limitations . 12
8.7 Small fans . 13
9 Fan operating conditions .13
9.1 General . 13
9.2 Measurement of ambient conditions . . 13
9.3 Fan rotational speed . 13
9.4 Determination of fan aerodynamic operating point . 13
9.5 Control of fan operating condition . . 13
10 Information to be recorded . 14
10.1 General .14
10.2 Fan under test .14
10.2.1 Description of the fan under test .14
10.2.2 Operating conditions .14
10.2.3 Mounting conditions .14
10.3 Acoustic environment .14
10.4 Acoustic data appropriate to the method of test . 15
11 Calculations and evaluations .16
11.1 Calculation of one-third octave band levels .16
11.2 Calculation of overall sound power levels .17
11.3 Calculation of A-weighted sound power level .17
11.4 Evaluation .17
iii
ISO/FDIS 13347-1:2025(en)
12 Test report . 17
12.1 General .17
12.2 Description of test site, arrangement of fan, location of measuring points .18
12.3 Instrumentation used .18
12.4 Subjective assessment of the noise character .18
12.5 Measured values and test results .18
Annex A (normative) Effect of rotational speed changes .20
Annex B (informative) Change of gas or air conditions .21
Annex C (normative) Corrections for end reflection .22
Annex D (informative) Simplified anechoic termination .
...
ISO/DISFDIS 13347-1:2024(en)
2024-07-23
ISO/TC 117
Secretariat: BS BSI
Date: 2025-04-23
Fans — Determination of fan sound power levels under standardized
laboratory conditions —
Part 1:
General overview
Ventilateurs — Détermination des niveaux de puissance acoustique des ventilateurs dans des conditions de
laboratoire normalisées —
Partie 1: Présentation générale
FDIS stage
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'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
E-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland.
ICS 17.140.20; 23.120
Price based on 34 pages
ISO/DIS 13347-1:2024(en)
Contents Page
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 2
4 Limitations on use . 7
5 Measurement uncertainty . 8
6 Instrumentation . 10
7 Test methods . 11
8 Fan installation conditions . 12
9 Fan operating conditions . 14
10 Information to be recorded . 15
11 Calculations and evaluations . 18
12 Test report . 19
Annex A (normative) Effect of rotational speed changes . 22
Annex B (informative) Change of gas or air conditions . 23
Annex C (normative) Corrections for end reflection . 24
Annex D (informative) Simplified anechoic termination . 29
Annex E (normative) Uncertainty analysis . 31
Annex F (normative) Calibration of reference sound source . 37
Annex G (informative) Filter weighted measurements . 39
Bibliography . 40
Foreword iv
Introduction v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and units . 2
4 Limitations on use . 6
5 Measurement uncertainty . 7
6 Instrumentation . 8
7 Test methods . 9
8 Fan installation conditions . 10
iii
9 Fan operating conditions .12
10 Information to be recorded .13
11 Calculations and evaluations .16
12 Test report .17
Annex A (normative) Effect of rotational speed changes .19
Annex B (informative) Change of gas or air conditions .20
Annex C (normative) Corrections for end reflection .21
Annex D (informative) Simplified anechoic termination .25
Annex E (normative) Uncertainty analysis .26
Annex F (normative) Calibration of reference sound source .31
Annex G (informative) Filter weighted measurements .33
Bibliography 34
ICS 17.140.20; 23.120
Price based on 34 pages
ISO/DIS 13347-1:2024(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.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 117, Fans.
This fourth edition cancels and replaces the third edition (ISO 13347-1:2004), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 13347-41:2004/Cor 1:2006 and the
Amendment ISO 13347-41:2004/Amd 1:2010.
The main changes compared with ISO 13347-1:2004 are as follows:
— the inclusion of acoustic methods for installation category E fans;
— symbols have been harmonized with those used in ISO 5801 and other ISO standards as listed in
Normativenormative references [2][0];
— editorial corrections have been incorporatedrevisions.
A list of all parts in the ISO 13347 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.www.iso.org/members.html.
v
ICS 17.140.20; 23.120
Price based on 34 pages
ISO/DIS 13347-1:2024(en)
Introduction
This document deals with the determination of the fan sound power level appropriate to a particular
application. In describing the test and rating procedures, numerous references are made to ISO 5801 as
well as to other relevant ISO standards. This general overview should be read in conjunction with the
appropriate part of the ISO 13347 series that specifies, in detail, methods for determining the sound
power propagated from a fan in specified installation conditions as a function of frequency.
This document primarily deals with the determination of sound power levels of fans used in five
installation categories (see Clause 4)4) for ducted and non-ducted applications, including jet fans.
The test procedures described in this document relate to laboratory conditions. The measurement of
performance under site conditions is not included. Acoustic system effects can be considerable where the
airflow into and out of the fan is not free from swirl, nor fully developed.
This document describes methods for determining sound power levels of fans in one-third octave
bandwidths and one octave bandwidths.
Data obtained in accordance with this document can be used for the following purposes amongst others:
a) a) comparison of fans which are similar in size and type;
b) b) comparison of fans which are different in size, type, design, speed, etc;
c) c) determining whether a fan is suitable for a specified upper limit of sound emission;
d) d) scaling of fan noise from one size and speed to another size and speed of the same type of fan;
e) e) prediction of sound pressure level in application of the fan;
f) f) engineering work to assist in developing machinery and equipment with lower sound emissions.
This document along with the other parts of the ISO 13347 series offersspecifies a method, based on the
ISO 3740 series and ISO 9614-1 and ISO 9614-2, for acoustic testing of jet fans (and partition fans) from
the method currently described in ISO 13350.
NOTE: The Bibliography of this document hasbibliography contains further references for those wishing
to explore this subject in greater detail [1](see References [0] to [21]
vii
ISO/FDIS 13347-1:2025(en)
Fans — Determination of fan sound power levels under standardized
laboratory conditions — Part 1:
General overview
[0]).
viii
ISO/DIS 13347-1:2024(en)
DRAFT International Standard
Fans — Determination of fan sound power levels under standardized
laboratory conditions —
Part 1:
General overview
1 Scope
This document establishes principles for the determination of the acoustic performance of fans. In addition,
itthis document can be used to determine the acoustic performance of fans combined with an ancillary device
such as a roof cowl or damper or, where the fan is fitted with a silencer, the sound power resulting from the
fan and silencer combination.
2 Normative references
The following referenced documents are indispensable forreferred to in the applicationtext 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 266, Acoustics — Preferred frequencies
ISO 3741, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Precision methods for reverberation test rooms
ISO 3743 (all parts), Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure
ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering
method in an essentially free field over a reflecting plane
ISO 3745, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
press
...
PROJET FINAL
Norme
internationale
ISO/FDIS 13347-1
ISO/TC 117
Ventilateurs — Détermination des
Secrétariat: BSI
niveaux de puissance acoustique
Début de vote:
des ventilateurs dans des conditions
2025-05-08
de laboratoire standardisées —
Vote clos le:
2025-07-03
Partie 1:
Présentation générale
Fans — Determination of fan sound power levels under
standardized laboratory conditions —
Part 1: General overview
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/FDIS 13347-1:2025(fr) © ISO 2025
PROJET FINAL
ISO/FDIS 13347-1:2025(fr)
Norme
internationale
ISO/FDIS 13347-1
ISO/TC 117
Ventilateurs — Détermination des
Secrétariat: BSI
niveaux de puissance acoustique
Début de vote:
des ventilateurs dans des conditions
2025-05-08
de laboratoire standardisées —
Vote clos le:
2025-07-03
Partie 1:
Présentation générale
Fans — Determination of fan sound power levels under
standardized laboratory conditions —
Part 1: General overview
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
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Publié en Suisse Numéro de référence
ISO/FDIS 13347-1:2025(fr) © ISO 2025
ii
ISO/FDIS 13347-1:2025(fr)
Sommaire Page
Avant-propos .v
Introduction .vi
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes, définitions et symboles . 2
3.1 Termes et définitions .2
3.2 Symboles — niveaux de puissance acoustique du ventilateur .4
3.3 Autres symboles .5
4 Limites d'utilisation . 7
5 Incertitude de mesure. 8
6 Appareillage de mesure . 10
6.1 Microphone .10
6.1.1 Câble du microphone .10
6.1.2 Sonomètre ou autre amplificateur de microphone .10
6.2 Analyseur de fréquence .10
6.3 Écrans antiturbulences et antivent .11
6.3.1 Écrans antivent .11
6.3.2 Tube d'échantillonnage .11
6.3.3 Bruit erroné généré par le vent .11
6.4 Source sonore de référence (RSS) .11
7 Méthodes d'essais .11
7.1 Généralités .11
7.2 Considérations spéciales .11
8 Conditions d'installation du ventilateur .12
8.1 Généralités . 12
8.2 Méthode d'essai de la salle réverbérante . 13
8.3 Méthode d'essai de la surface enveloppante . 13
8.4 Méthode de l'intensité acoustique. 13
8.5 Méthode d'essai en conduit . 13
8.6 Limitations .14
8.7 Ventilateurs de petite taille .14
9 Conditions de fonctionnement du ventilateur . 14
9.1 Généralités .14
9.2 Mesurage des conditions ambiantes .14
9.3 Vitesse de rotation du ventilateur .14
9.4 Détermination du point de fonctionnement aérodynamique du ventilateur .14
9.5 Contrôle des conditions de fonctionnement du ventilateur .14
10 Informations à consigner . .15
10.1 Généralités . 15
10.2 Ventilateur soumis à l'essai . 15
10.2.1 Description du ventilateur soumis à l'essai . 15
10.2.2 Conditions de fonctionnement . 15
10.2.3 Conditions de montage . 15
10.3 Environnement acoustique .16
10.4 Données acoustiques selon la méthode d'essai .17
11 Calculs et évaluations .18
11.1 Calcul des niveaux par bande de tiers d'octave .18
11.2 Calcul des niveaux globaux de puissance acoustique .18
11.3 Calcul du niveau de puissance acoustique pondéré A .18
11.4 Évaluation .18
iii
ISO/FDIS 13347-1:2025(fr)
12 Rapport d’essai . 19
12.1 Généralités .19
12.2 Description du site d'essai, de la disposition du ventilateur, de l'emplacement des
points de mesurage .19
12.3 Appareillage de mesure utilisé .19
12.4 Évaluation subjective du caractère du bruit .19
12.5 Valeurs mesurées et résultats d'essai . 20
Annexe A (normative) Effet des changements de vitesse de rotation.21
Annexe B (informative) Variation des conditions du gaz ou de l'air .22
Annexe C (normative) Correction de réflexion d'extrémité .23
Annexe D (informative) Terminaison anéchoïque simplifiée .28
Annexe E (normative) Analyse des incertitudes .
...
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