ISO INTERNATIONAL STANDARD 11654 First edition 1997-04-01 Acoustics - Sound absorbers for use in buildings Rating of sound absorption Acoustique-Absorbantspour I'utilisationdans les batiments Evaluation de I'absorption acoustique This material is reproduced from Iso documents under International Organization for Standardization (ISO) Copyright License number IHS/cC/1996. Not for resale. No part of these IsO documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 73410 79), IHs or the Iso Licensor's members. Reference number ISO11654:1997(E) Copyright Intemational Organization for Standardization r license with IS lot for Resale ISO 11654:1997(E) Contents Page 1 Scope 1 2 Normative references 1 3 Definitions ..... 2 4 Calculation 2 5 Presentation of results 3 Annexes A Examples of calculations of aw with and without a shape 5 B Classification of sound absorbers . 6 c Example of a standardized diagramforαs values 7 @ISO1997 All rights reserved.Unless otherwise specified,no partofthispublicationmaybe reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm,withoutpermissioninwritingfromthepublisher. InternationalOrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; s=central Printed in Switzerland ii No reproduction or networking permited without license from IHS Not for Resale ISO 11654:1997(E) CISO 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. 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 ISO 11654 was prepared by Technical Committee IsO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics. Annexes A, B and C of this International Standard are for information only. ili Copyrightlntemational Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale