SIST EN ISO 11691:2009

SLOVENSKI STANDARD
SIST EN ISO 11691:2009
01-november-2009
1DGRPHãþD
SIST EN ISO 11691:1997
Akustika - Merjenje dodanega dušenja dušilnika zvoka v kanalu brez pretoka -
Laboratorijska informativna metoda (ISO 11691:1995)
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory
survey method (ISO 11691:1995)
Akustik - Messung des Einfügungsdämpfungsmaßes von Schalldämpfern in Kanälen
ohne Strömung - Laborverfahren der Genauigkeitsklasse 3 (ISO 11691:1995)
Acoustique - Détermination de la perte d'insertion de silencieux en conduit sans
écoulement - Méthode de mesurage en laboratoire (ISO 11691:1995)
Ta slovenski standard je istoveten z: EN ISO 11691:2009
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
SIST EN ISO 11691:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11691:2009

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SIST EN ISO 11691:2009
EUROPEAN STANDARD
EN ISO 11691
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 91.120.20 Supersedes EN ISO 11691:1995
English Version
Acoustics - Measurement of insertion loss of ducted silencers
without flow - Laboratory survey method (ISO 11691:1995)
Acoustique - Détermination de la perte d'insertion de Akustik - Messung des Einfügungsdämpfungsmaßes von
silencieux en conduit sans écoulement - Méthode de Schalldämpfern in Kanälen ohne Strömung -
mesurage en laboratoire (ISO 11691:1995) Laborverfahren der Genauigkeitsklasse 3 (ISO
11691:1995)
This European Standard was approved by CEN on 3 August 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 11691:2009: E
worldwide for CEN national Members.

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SIST EN ISO 11691:2009
EN ISO 11691:2009 (E)
Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC .4
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .5

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SIST EN ISO 11691:2009
EN ISO 11691:2009 (E)
Foreword
The text of ISO 11691:1995 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 11691:2009 by
Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.
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 January 2010, and conflicting national standards shall be withdrawn at
the latest by January 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 11691:1995.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directives.
For relationship with EC Directives, see informative Annexes ZA and ZB, which are integral parts of this
document.
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 11691:1995 has been approved by CEN as a EN ISO 11691:2009 without any modification.
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SIST EN ISO 11691:2009
EN ISO 11691:2009 (E)

Annex ZA
(informative)

Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 98/37/EC, amended by 98/79/EC on machinery.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements of that Directive and associated EFTA regulations.
WARNING - Other requirements and other EU Directives may be applicable to the product(s) falling within the
scope of this standard.
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SIST EN ISO 11691:2009
EN ISO 11691:2009 (E)
Annex ZB
(informative)

Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements of that Directive and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.




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SIST EN ISO 11691:2009

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SIST EN ISO 11691:2009
IS0
INTERNATIONAL
11691
STANDARD
First edition
1995-08-I 5
Corrected and reprinted
1995-l Z-01
- Measurement of insertion
Acoustics
loss of ducted silencers without flow -
Laboratory survey method
- D&ermina tion de la perte d’insertion de silencieux en
Acous tique
- M&hode de mesurage en laboratoire
conduit sans kcoulement
Reference number
IS0 11691 :I 995(E)

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SIST EN ISO 11691:2009
IS0 11691:1995(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 11691 was prepared by Technical Committee
ISO/TC 43, Acoustics, Subcommittee SC I, Noise.
Annex A of this International Standard is for information only.
0 IS0 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 11691:2009
Q IS0 IS0 11691:1995(E)
Introduction
The insertion loss of absorbent silencers is generally not affected by the
air flow, provided that the flow velocity does not exceed approximately
20 m/s in the narrowest cross-section of the silencer. In practice, non-
uniform flow distributions must be considered, therefore the limit velocity
of 20 m/s corresponds to a design velocity of 10 m/s to 15 m/s.
. . .
III

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SIST EN ISO 11691:2009
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SIST EN ISO 11691:2009
INTERNATIONAL STANDARD 0 IS0 IS0 11691:1995(E)
Acoustics - Measurement of insertion loss of ducted
silencers without flow - Laboratory survey method
1.2 Measurement uncertainty
1 Scope
Exact information on the precision of the method
cannot be given at this time. Therefore this Inter-
national Standard is denoted a survey standard.
1.1 General
Interlaboratory tests are necessary for the determi-
This International Standard specifies a laboratory sub-
nation of the standard deviation of reproducibility, OR,
stitution method to determine the insertion loss
of the method (relevant terms and methods are given
without flow of ducted, mainly absorbent, circular and
in IS0 5725-l). It is, however, estimated that this
rectangular silencers, as well as other duct elements
method will have a OR which is comparable to that of
for use in ventilating and air-conditioning systems.
IS0 7235. See table 1.
NOTE 1 Laboratory measurement procedures for ducted
silencers with superimposed flow are described in
Table 1 - Estimated values of the standard
IS0 7235.
deviation of reproducibility
This International Standard is applicable to silencers
Midband frequencies of
Standard deviation of
where the design velocity does not exceed 15 m/s.
one-third-octave band
reproducibility, OR
As the method does not include self-generated flow
Hz dB
noise, this International Standard is not suitable for
tests on silencers where this type of noise is of great
50 to 1 250
2
importance for the evaluation of the silencer per-
1600tol0000 3
formance.
The insertion loss determined according to this Inter-
national Standard in a laboratory will not necessarily
2 Normative references
be the same as the insertion loss that will be obtained
in an installation in the field. Different sound and flow
The following standards contain provisions which,
fields in the duct will yield different results. As this
through reference in this text, constitute provisions
International Standard requires regular test ducts, the
of this International Standard. At the time of publi-
results may include some flanking transmission via
cation, the editions indicated were valid. All standards
structural vibrations in the duct walls, that sets an
are subject to revision, and parties to agreements
upper limit to the insertion loss that can be deter-
based on this International Standard are encouraged
mined.
to investigate the possibility of applying the most re-
NOTE 2 IS0 7235 gives methods for determining this cent editions of
...