SIST EN ISO 17624:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRPRþMRAkustik - Leitfaden für den Schallschutz in Büros und Arbeitsräumen durch Schallschirme (ISO 17624:2004)Acoustique - Lignes directrices pour la réduction du bruit dans les bureaux et locaux de travail au moyen d'écrans acoustiques (ISO 17624:2004)Acoustics - Guidelines for noise control in offices and workrooms by means of acoustical screens (ISO 17624:2004)13.140Vpliv hrupa na ljudiNoise with respect to human beingsICS:Ta slovenski standard je istoveten z:EN ISO 17624:2004SIST EN ISO 17624:2005en01-junij-2005SIST EN ISO 17624:2005SLOVENSKI
STANDARD



SIST EN ISO 17624:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 17624December 2004ICS 13.140English versionAcoustics - Guidelines for noise control in offices andworkrooms by means of acoustical screens (ISO 17624:2004)Acoustique - Lignes directrices pour la réduction du bruitdans les bureaux et locaux de travail au moyen d'écransacoustiques (ISO 17624:2004)Akustik - Leitfaden für den Schallschutz in Büros undArbeitsräumen durch Schallschirme (ISO 17624:2004)This European Standard was approved by CEN on 21 June 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17624:2004: ESIST EN ISO 17624:2005



EN ISO 17624:2004 (E) 2
Foreword
The text of ISO 17624:2004 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 17624:2004 by Technical Committee CEN/TC 43 " 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 June 2005, and conflicting national standards shall be withdrawn at the latest by June 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 17624:2004 has been approved by CEN as EN ISO 17624:2004 without any modifications.
SIST EN ISO 17624:2005



INTERNATIONALSTANDARDISO17624First edition2004-05-15Reference numberISO17624:2004(E)© ISO2004Acoustics— Guidelines for noise control in offices and workrooms by means of acoustical screensAcoustique— Lignes directrices pour la réduction du bruit dans les bureaux et locaux de travail au moyen d'écrans acoustiques
SIST EN ISO 17624:2005



ISO17624:2004(E)ii© ISO2004–All rights reservedPDF disclaimerThis PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shallnot be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. Indownloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariataccepts no liability in this area.Adobe is a trademark of Adobe Systems Incorporated.Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creationparameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In theunlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.©ISO2004All 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 either ISO at the address below orISO's member body in the country of the requester.ISO copyright officeCase postale 56  CH-1211 Geneva 20Tel.+ 41 22 749 01 11Fax+ 41 22 749 09 47E-mailcopyright@iso.orgWebwww.iso.orgPublished in SwitzerlandSIST EN ISO 17624:2005



ISO17624:2004(E)© ISO2004–All rights reservediiiContents Page1Scope . 12Normative references . 13Terms and definitions . 24Symbols . 35Basic principles and conditions of application . 35.1Contributions to the sound attenuation . 35.2Absorption close to the sound source . 45.3Screening effect . 45.4Decoupling . 55.5Absorption away from the sound source . 55.6Further effects of screens . 56Types of acoustical screens and special requirements . 66.1Partitioning of large rooms . 66.2Noise control for individual work stations . 76.3Protection of individual work stations . 77Combined effect of acoustical screens and acoustical claddings . 78Acoustical requirements for planning and verification purposes . 88.1Sound absorption . 88.2Sound insulation . 88.3In-situ sound attenuation . 89Information for user inquiries and information to be provided by the supplier/manufacturer of a screen
99.1Information to be provided by the user . 99.2Information to be provided by the supplier/manufacturer . 9AnnexA(informative)Case studies . 10Bibliography . 14SIST EN ISO 17624:2005



ISO17624:2004(E)iv© ISO2004–All rights reservedForewordISO (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 ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational 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 patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO17624 was prepared by Technical Committee ISO/TC43, Acoustics, Subcommittee SC1, Noise.SIST EN ISO 17624:2005



ISO17624:2004(E)© ISO2004–All rights reservedvIntroductionBesides silencers and enclosures (see ISO14163 and ISO15667, respectively), indoor screens are used assecondary means of noise control in workrooms and offices. For workplaces containing machinery, someinformation on such elements is given in ISO11690-2:1996, AnnexesE and F. More detailed information can befound in the bibliographic references.SIST EN ISO 17624:2005



.viSIST EN ISO 17624:2005



INTERNATIONAL STANDARDISO17624:2004(E)© ISO2004–All rights reserved1Acoustics— Guidelines for noise control in offices and workrooms by means of acoustical screens1ScopeThis International Standard deals with the effectiveness of acoustical screens. It specifies the acoustical andoperational requirements to be agreed upon between the supplier or manufacturer and the user of acousticalscreens. This International Standard is applicable to the following types of acoustical screens:a)free-standing acoustical screens for offices, service areas, exhibition areas, and similar rooms;b)acoustical screens integrated in the furniture of such rooms;c)portable and removable acoustical screens for workshops;d)fixed room partitions with more than
of the connecting area open and acoustically untreated.Walls of partial acoustic enclosures and cabins which, together with the room boundary surfaces, also partitiona room and provide more than
open and acoustically untreated area, are also treated as acousticalscreens.NOTEGuidance on complete acoustic enclosures is given in ISO15667.This International Standard is not applicable to cabinet walls and similar multi-layer walls whose thicknessexceeds , nor to banners and other types of suspended baffles.2Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO140-3, Acoustics— Measurement of sound insulation in buildings and of building elements— Part3:Laboratory measurements of airborne sound insulation of building elementsISO354, Acoustics— Measurement of sound absorption in a reverberation roomISO717-1, Acoustics— Rating of sound insulation in buildings and of building elements— Part1: Airbornesound insulationISO9053, Acoustics— Materials for acoustical applications— Determination of airflow resistanceISO10534-1, Acoustics— Determination of sound absorption coefficient and impedance in impedancetubes— Part1: Method using standing wave ratioISO10534-2, Acoustics— Determination of sound absorption coefficient and impedance in impedancetubes— Part2: Transfer-function methodISO11654, Acoustics— Sound absorbers for use in buildings— Rating of sound absorptionISO11821:1997, Acoustics— Measurement of the in situ sound attenuation of a removable screen10%10%0,2mSIST EN ISO 17624:2005



ISO17624:2004(E)2© ISO2004–All rights reserved3Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1 (acoustical) screenobject that is specifically designed to shield one or several specified positions in a given area from the noise of(a) specified sound source(s)[ISO11821:1997]3.2 portable or removable (acoustical) screen(acoustical) screen that is designed to be dismantled or relocated without the other environmental conditionsbeing changedNOTEAdapted from ISO11821:1997.3.3 insertion sound pressure level differencein-situ sound attenuationdifference, in decibels, between the sound pressure levels, in octave bands or one-third-octave bands, at aspecified position without and with the screen installed when one or several specified sound sources are inoperationNOTEAdapted from ISO14163:1998.3.4 A-weighted insertion sound pressure level differenceA-weighted (in-situ) sound attenuationdifference, in decibels, between the A-weighted sound pressure levels at a specified position without and withthe screen installed, when one or several specified sound sources are in operationNOTE1The A-weighting is specified in IEC61672-1.NOTE2Adapted from ISO14163:1998.3.5 insertion lossdifference, in decibels, between the levels of the sound power, in octave bands or one-third-octave bands,radiated into the room by the sound source(s) to be shielded without and with the screen installedNOTEBy definition, the sound power is to be measured on an enveloping surface enclosing the sound source(s) to beshielded and the space for positioning the screen. It mainly applies to screens placed close to the source.3.6 sound reduction indextransmission lossquantity, in decibels, characterizing the sound energy transmitted through a building element in relation to thesound energy incident upon the element as per ISO140-33.7 free-field screen sound attenuationdifference, in decibels, between the sound pressure level of the sound reaching a specified position on thedirect path from the sound source to be shielded when the screen is not installed, and the level of the diffractedsound when the screen is installed, calculated fromDpDpADiRDzSIST EN ISO 17624:2005



ISO17624:2004(E)© ISO2004–All rights reserved3(1)whereis the path length difference, in metres, between the longer sound propagation path around the leasteffective diffracting edge of the screen and the direct path;is the wavelength, in metres, of the sound with the frequency
in hertz.NOTE1The screen sound attenuation is given for octave-band or one-third-octave-band centre frequencies.NOTE2The reduced screen sound attenuation,
approximately accounts for reflections from a wall close to the soundsource and considers the least effective diffracting edge of the screen, for a receiver located within the reverberation radiusfrom the source, as per(2)It is
to
lower than the free-field screen sound attenuation .4SymbolsThe following symbols are used in this International Standard.equivalent absorption area, in square metres, see 5.3;absorption coefficient, see 8.1;average room width in the vicinity of the screen, in metres;screen height, in metres;average room height in the vicinity of the screen, in metres;length, in metres, of mean free path between reflections from scattering objects, typically ;reverberation radius, in metres, see 5.3;distance from source to receiver, in metres, see 6.1;reverberation time, in seconds, see 5.3;volume, in cubic metres, see 5.3.5Basic principles and conditions of application5.1Contributions to the sound attenuationAcoustical screens typically provide an A-weighted sound attenuation of up to
in offices and workrooms.This attenuation results from (see Figure1):—sound absorption by the screen surface;—blocking of the direct sound propagation path from a source to the receiver;—partial decoupling of the sound fields on both sides of the screen.The sound reduction index of all components forming the screen is usually sufficiently large due to structuralrequirements and, therefore, does not need any further consideration. Sealing joints between screen elementsDz=10lg3+40zλdBzλfDz,rDz,r=10lg1+20zλdB3dB5dBDzAαBhHlS10mrrsTV10dBSIST EN ISO 17624:2005



ISO17624:2004(E)4© ISO2004–All rights reservedis only necessary to optimize the performance of screens intended to provide an insertion loss of more than.5.2Absorption close to the sound sourceThe sound absorption of a screen close to a sound source results in a reduction in the sound power radiated bythat source into the space behind the screen, which is characterized by the insertion loss . The value of
isgreater—the higher the absorption coefficient of the screen surface facing the sound source,—the more pronounced the directivity of the sound radiation towards the screen, and—the more completely the sound source is enclosed by the screen.5.3Screening effectBlocking the direct sound propagation path between the sound source and the receiver results in a reduction indirect sound characterized by the reduced screen attenuation
as per Equation(2). The value of
isgreater—the larger the
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