Bsi bs en 60704 2 13 2017

BS EN 60704-2-13:2017 BSI Standards Publication Household and similar electrical appliances — Test code for the determination of airborne acoustical noise Part 2-13: Particular requirements for range hoods and other cooking fume extractors BRITISH STANDARD BS EN 60704-2-13:2017 National foreword This British Standard is the UK implementation of EN 60704-2-13:2017 It is identical to IEC 60704-2-13:2016 It supersedes BS EN 60704-2-13:2011 which will be withdrawn on 30 November 2019 The UK participation in its preparation was entrusted to Technical Committee CPL/59, Performance of household electrical appliances A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 580 88474 ICS 17.140.20; 97.040.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017 Amendments/corrigenda issued since publication Date Text affected BS EN 60704-2-13:2017 EUROPEAN STANDARD EN 60704-2-13 NORME EUROPÉENNE EUROPÄISCHE NORM January 2017 ICS 17.140.20; 97.040.20 Supersedes EN 60704-2-13:2011 English Version Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods and other cooking fume extractors (IEC 60704-2-13:2016) Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 2-13: Exigences particulières pour les hottes de cuisine et autres extracteurs de fumée de cuisine (IEC 60704-2-13:2016) Elektrische Geräte für den Hausgebrauch und ähnliche Zwecke - Prüfvorschrift für die Bestimmung der Luftschallemission - Teil 2-13: Besondere Anforderungen für Dunstabzugshauben (IEC 60704-2-13:2016) This European Standard was approved by CENELEC on 2016-11-30 CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 60704-2-13:2017 E BS EN 60704-2-13:2017 EN 60704-2-13:2017 European foreword The text of document 59K/272/CDV, future edition of IEC 60704-2-13, prepared by SC 59K: "Performance of household and similar electrical cooking appliances" of IEC/TC 59: "Performance of household and similar electrical appliances." was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60704-2-13:2017 The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-08-30 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2019-11-30 This document supersedes EN 60704-2-13:2011 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association Endorsement notice The text of the International Standard IEC 60704-2-13:2016 was approved by CENELEC as a European Standard without any modification BS EN 60704-2-13:2017 EN 60704-2-13:2017 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies NOTE When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies NOTE Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu Addition to Annex ZA of EN 60704-1:2010: Publication IEC 61591 Year 1997 + A1 + A2 ISO 7235 2005 2010 - Title Household range hoods - Methods for measuring performance Acoustics - Laboratory measurement procedures for ducted silencers and airterminal units - Insertion loss, flow noise and total pressure loss EN/HD EN 61591 Year 1997 + A1 + A2 + A11 + A12 EN ISO 7235 2006 2011 2014 2015 2009 Replace Publication ISO 3743-1 Year 2010 ISO 3744 2010 Title EN/HD Acoustics - Determination of sound power EN ISO 3743-1 levels and sound energy levels of noise sources using sound pressure Engineering methods for small movable sources in reverberant fields - Part 1: Comparison method for a hard-walled test room Acoustics - Determination of sound power EN ISO 3744 levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane Year 2010 2010 –2– BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 CONTENTS FOREWORD INTRODUCTION Scope and object Normative references Terms and definitions Measurement methods and acoustical environments Instrumentation Operation and location of appliances under test Measurement of sound power levels 12 Calculation of sound pressure and sound power levels 12 Information to be recorded 13 10 Information to be reported 13 Annexes 16 Annex A (normative) 16 Figure 101 – Standard load for cooking fume extractors 14 Figure 102 – Example of standard stand 14 Figure 103 – Standard load for cooking fume extractors with an external fan 15 Table 101 – Standard deviations of sound power levels Table 102 – Standard deviations for declaration and verification BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 –3– INTERNATIONAL ELECTROTECHNICAL COMMISSION HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE – Part 2-13: Particular requirements for range hoods and other cooking fume extractors FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees) The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”) Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter 5) IEC itself does not provide any attestation of conformity Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity IEC is not responsible for any services carried out by independent certification bodies 6) All users should ensure that they have the latest edition of this publication 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications 8) Attention is drawn to the Normative references cited in this publication Use of the referenced publications is indispensable for the correct application of this publication 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights IEC shall not be held responsible for identifying any or all such patent rights International Standard IEC 60704-2-13 has been prepared by subcommittee 59K: Performance of household and similar electrical cooking appliances, of IEC technical committee 59: Performance of household and similar electrical appliances This third edition cancels and replaces the second edition published in 2011 This edition constitutes a technical revision This edition includes the following significant technical changes with respect to the previous edition: a) change of title, scope and definitions 3.103 and 3.104: the standard is dealing with cooking fume extractors (this covers range hoods and down-draft systems); b) exhaust pipe of down-draft systems specified; –4– BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 c) built-in recirculation-air range hoods with an air outlet device specified; d) Annex AA has been deleted The text of this standard is based on the following documents: CDV Report on voting 59K/272/CDV 59K/283/RVC Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table This document has been drafted in accordance with the ISO/IEC Directives, Part This Part 2-13 is intended to be used in conjunction with IEC 60704-1:2010 (3rd edition), Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 1: General requirements NOTE When “Part 1” is mentioned in this standard, it refers to IEC 60704-1 This Part 2-13 supplements or modifies the corresponding clauses in IEC 60704-1, so as to establish the test code for cooking fume extractors When a particular subclause of Part is not mentioned in this Part 2-13, that subclause is applicable as far as reasonable Where this standard states "addition", "modification" or "replacement", the relevant requirements, test specifications or explanatory matter in Part are to be adapted accordingly Subclauses, tables and figures that are numbered starting from 101 are additional to those in Part Additional annexes are lettered AA, BB, etc Unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including those in a replaced clause or subclause A list of all parts in the IEC 60704 series, published under the general title Household and similar electrical appliances – Test code for the determination of airborne acoustical noise, can be found on the IEC website The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document At this date, the document will be • reconfirmed, • withdrawn, • replaced by a revised edition, or • amended BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 –5– INTRODUCTION The measuring conditions specified in this part of IEC 60704 provide for sufficient accuracy in determining the noise emitted and comparing the results of measurements taken by different laboratories, whilst simulating as far as possible the practical use of household range hoods and other cooking fume extractors It is recommended to consider the determination of noise levels as part of a comprehensive testing procedure covering many aspects of the properties and performance of household range hoods and other cooking fume extractors NOTE As stated in the introduction to IEC 60704-1, this test code is concerned with airborne noise only –6– BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE – Part 2-13: Particular requirements for range hoods and other cooking fume extractors Scope and object This clause of Part is applicable except as follows: 1.1 1.1.1 Scope General Addition: These particular requirements apply to electrical range hoods and other cooking fume extractors for household and similar use intended for filtering the air of a room or for exhausting the air out of a room, including their accessories and their component parts It also applies to cooking fume extractors with an external fan which may be mounted inside or outside of the room where the range hood is located or a down-draft system that is arranged beside, behind or under the cooking surface 1.1.2 Types of noise Replacement: The methods specified in ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by cooking fume extractors 1.1.3 Size of source Replacement: The method specified in ISO 3744 is applicable to noise sources of any size When applying ISO 3743-1 and ISO 3743-2, care should be taken that the maximum size of the cooking fume extractor under test fulfils the requirements specified in 1.2 of ISO 3743-1 and 1.3 of ISO 3743-2 1.2 Object Addition: This standard describes the determination of the noise emission of household cooking fume extractors under normal operating conditions and at the highest fan speed setting for normal use NOTE 101 If a boost position is incorporated, this is not taken into account (see 6.5 of IEC 61591:1997) NOTE 102 A boost position is a setting of a control for occasional use, which results in a higher temporary fan speed (see 6.5 of IEC 61591:1997) Requirements for the declaration of noise emission values are not within the scope of this standard BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 –7– NOTE 103 For determining and verifying noise emission values declared in product specifications, see IEC 60704-3 1.3 Measurement uncertainty Replacement: The estimated values of standard deviations of sound power levels, determined according to this standard, are as follows (see Table 101): Table 101 – Standard deviations of sound power levels Standard deviation (dB) σ r (repeatability) σ R (reproducibility) 0,4 1,0 Addition: 1.101 Standard deviation for declaration and verification For the purpose of determining and verifying declared noise emission values according to IEC 60704-3, the following values apply (see Table 102): Table 102 – Standard deviations for declaration and verification Standard deviation (dB) σ P (production) σ t (total) σ M (reference) 1,5 to 1,7 1,8 to 2,0 2,0 Normative references This clause of Part is applicable except as follows: Replacement: ISO 3743-1:2010, Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for small movable sources in reverberant fields – Part 1: Comparison method for a hard-walled test room ISO 3744:2010, Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane Addition: IEC 61591:1997, Household range hoods - Methods for measuring performance IEC 61591:1997/AMD1:2005 IEC 61591:1997/AMD2:2010 ISO 7235:2003, Acoustics – Laboratory measurement procedures for ducted silencers and airterminal units – Insertion loss, flow noise and total pressure loss _ There exists a consolidated edition 1.1 of IEC 61591 (2005), that includes IEC 61591 (1997) and its amendment (2005) –8– BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 Terms and definitions This clause of Part is applicable except as follows: Addition: 3.101 cooking fume extractor device intended to collect cooking vapours, smells and fumes Note to entry: The filtered air may be discharged back into the room or away by ducts Examples are: range hoods, down-draft systems or range hoods with external fans 3.102 range hood appliance installed over a hob and through which air is passed to remove contaminants from the room [SOURCE: IEC 61591:1997, 3.1] 3.103 recirculation-air cooking fume extractor range hood or other cooking fume extractor containing filters to remove contaminants, after which the cleaned air is discharged back into the room [SOURCE: IEC 61591:1997, 3.2, modified, – in the term, "range hood" was replaced by "cooking fume extractor" and " or other cooking fume extractor" was added in the definition.] 3.104 air-extracting cooking fume extractor range hood or other cooking fume extractor which discharges the collected air to the outside of the building by means of ducting Note to entry: The range hood can incorporate an internal or external fan [SOURCE: IEC 61591:1997, 3.3, modified – in the term, "range hood" was replaced by "cooking fume extractor" and " or other cooking fume extractor" was added in the definition ] 3.105 down-draft system cooking fume extractor intended for installation adjacent to a household cooking range, hob or similar cooking appliance that draws vapour down into an internal or external exhaust duct [SOURCE: IEC 61591:1997/AMD2:2010, 3.9] Measurement methods and acoustical environments This clause of Part is applicable except as follows: 4.2 Direct method Addition: NOTE 101 If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the special reverberation room may increase In such cases additional microphone positions or source positions may be necessary as specified in ISO 3743-2 BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 4.3 –9– Comparison method Addition: NOTE 101 If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the hard-walled test room or in the special reverberation room may increase In such cases additional microphone positions or source positions may be necessary as specified in ISO 3743-1 or ISO 3743-2 Instrumentation This clause of Part is applicable except as follows: 5.1 Instrumentation for measuring acoustical data Addition: Windscreens should be used if necessary and then corrections for change in the microphone sensitivity shall be added to the observed sound pressure levels Operation and location of appliances under test This clause of Part is applicable except as follows: 6.1 Equipping and pre-conditioning of appliances 6.1.1 Addition: Recirculation-air cooking fume extractors should be fitted with (a) clean filter(s) Air-extraction cooking fume extractors shall be fitted with the pipe coupling ring, if any, having the largest diameter among those provided by the manufacturer If the cooking fume extractor is designed to accommodate additional filters, those filters shall be clean and appropriately fitted 6.1.3 Replacement: Prior to noise measurements, the cooking fume extractor shall have been in operation for running for at least h at the highest speed setting for normal use (see notes in 1.2) 6.1.4 Replacement: Immediately before each series of noise measurements, the cooking fume extractor equipped for its intended use is operated to stabilize at the highest speed setting for normal use (see notes in 1.2) for at least 10 6.2 Supply of electrical energy and of water or gas 6.2.3 and 6.2.4 Not applicable – 10 – 6.4 BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 Loading and operating of appliances during test 6.4.2 Replacement: The appliances shall be equipped according to 6.1.1 The cooking fume extractor shall be operated at the highest speed setting for normal use (see notes in 1.2) Air-extraction cooking fume extractors shall be loaded using a pipe connected to a muffler according to Figure 101 The pipe shall be rigid with smooth inner walls and shall have the widest diameter among those specified by the manufacturer If not stated, a standard pipe with the best fitting diameter shall be used The muffler shall have an insertion loss as specified in the table of Figure 101 It shall have a circular section with the same internal diameter as that of the pipe, a length as specified in Figure 101 and shall not have parts protruding inside that may cause additional pressure drops The pipe and the muffler shall also comply with all the specifications reported in Figure 101 and care shall be taken that they not radiate noise Cooking fume extractors with an external fan shall be connected to the fan with a pipe and a muffler according to Figure 103 The pipe shall be rigid with smooth inner walls and shall have the widest diameter among those specified by the manufacturer If not stated, a standard pipe with the best fitting diameter shall be used The muffler shall be provided with the appliance If the manufacturer did not provide a muffler, the appliance is tested without muffler In particular, when connecting the pipe and muffler system to the cooking fume extractor, care shall be taken that this connection does not transfer any additional structure borne noise For this purpose, isolating connecting pieces can be used Static forces from the standard load to the cooking fume extractor shall also be avoided The fastening of the muffler should not influence the acoustical field in the test room; for example, two wires could be fixed around the muffler and on the ceiling Whenever it is possible to choose among two or more exit holes for the pipe connection, the one on the upper side of the cooking fume extractor, if any, shall be used Cooking fume extractors designed for connection with more than one pipe at the same time shall be connected accordingly to the number of pipes required 6.4.3 6.5 Not applicable Location and mounting of appliances 6.5.1 Replacement: Range hoods not intended to be placed against a wall shall be located and mounted according to 6.5.4 6.5.2 Not applicable 6.5.3 Addition: BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 – 11 – If the air outlet is located at the rear side of the appliance, an additional 90° bend of the same type as the standard load shall be used for connection of the appliance to the standard exhaust system Down-craft systems are placed in normal position with a distance of D = × diameter of the duct + 50 mm between the back of the appliance and a vertical wall or plane, directly, without any resilient means other than those incorporated in the appliance For rectangular air outlets the distance of 25 cm is kept 6.5.4 Replacement: Range hoods intended to be placed against a wall, island range hoods and ceiling range hoods are placed at a distance of D = cm ± 0,5 cm between the back of the appliance and a vertical wall and supported by a stand with resilient means (an example is given in Figure 102) • either at a height of 0,6 m from the floor of the hard-walled test room or of the special reverberation test room with the mentioned distance from one vertical wall and with a minimum distance of m between any surface (including protruding parts) of the range hood and the nearest other wall; • or at a height of 0,6 m on a horizontal reflecting plane in the free field environment and with the mentioned distance between the back of the range hood and the vertical reflecting plane The minimum size of this vertical plane shall be at least equal to the size of the projection of the measurement surface The acoustic absorption coefficient of the vertical reflecting plane shall be smaller than 0,06 in the frequency range of interest Care shall be taken in order to avoid any kind of interference between the supports and the air intake of the appliance under test Care should be taken to avoid any direct contact between the appliance (including protruding parts, worktops, spacers, etc.) and the vertical reflecting plane 6.5.5 Addition: Down-draft systems shall be built-in according to the manufacturer’s installation instructions in an appropriate test enclosure according to Annex B of Part Built-in recirculation-air range hoods with an air outlet device separated from the air inlet device shall be built-in according to the manufacturer’s installation instructions in an appropriate test enclosure with the same material and thickness defined in Annex B of Part The bottom of the test enclosure shall be provided with a base shelf of the same material and thickness as the test enclosure if necessary for mounting the range hood If the distance between the air inlet and air outlet device is not defined in the manufacturer’s installation instructions, a minimum distance of 0,3 m between the outer shapes of the two devices has to be adhered to Unless otherwise specified, the opening of the air outlet shall be adjusted preferably to the floor direction Care shall be taken in order to avoid any kind of interference between the supports (Figure 102), the test enclosure, the air inlet and outlet device and the connecting pipe of the two devices Static forces from the supports to the range hood shall also be avoided Addition: – 12 – BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 6.5.101 For cooking fume extractors with external fan the air inlet device shall be located and mounted as described in 6.5.1, 6.5.3 or 6.5.4 The external fan shall be located in a way that the noise emitted by the housing of the fan and by the air outlet does not influence the measurement result Measurement of sound power levels This clause of Part is applicable except as follows: 7.1 Microphone array, measurement surface and RSS location for essentially freefield conditions over reflecting plane(s) 7.1.1 Not applicable 7.1.2 Replacement: For all cooking fume extractors the measurement surface is a parallelepiped with six microphone positions, as specified in 7.2.4 of ISO 3744 and in Figure of IEC 60704-1 Additional measurement positions may be required according to 8.1.2 of ISO 3744 The number of microphone positions may also be reduced according to 8.1.2 of ISO 3744 While defining the reference box around the appliance, for down-draft systems the suction has to be extended While defining the reference box around the appliance, the standard load connected to a cooking fume extractor operating in exhausting mode should not be taken into account NOTE The x and y axes are located in the vertical reflecting plane, with the x-axis directed vertically upwards and the front of the appliance directed in the direction of the z-axis The preferred value of the measurement distance d is m 7.1.3 to 7.1.6 Not applicable 7.4 Measurements 7.4.1 Addition: The A-weighted time averaged sound pressure level shall be measured over a period of at least 30 s Calculation of sound pressure and sound power levels This clause of Part is applicable except as follows: 8.1 General Addition: Noise emitted by the housing or by the air outlet of an external fan shall be considered as background noise BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 – 13 – Information to be recorded This clause of Part is applicable except as follows: 9.2 Description of appliance under test 9.2.2 Replacement: Design characteristics: for example chimney, free-standing, island, ceiling, slim line 9.7 Electric supply, water supply, etc 9.7.3 and 9.7.4 9.12 Not applicable Measurement data 9.12.5 Not applicable 10 Information to be reported This clause of Part is applicable except as follows: 10.3 Test conditions for the appliance 10.3.4 and 10.3.5 10.3.11 10.4 Not applicable Not applicable Acoustical data 10.4.10 Not applicable BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 – 14 – Dimensions in millimetres l3 l2 1,5 × d 90° l1 The muffler shall have the same internal diameter as that of the pipe and shall have at least the insertion loss reported in the table below The connections shall not interfere with the air flow to avoid any additional noise or pressure drop Pipe with smooth inner walls l1 + l2 + l3 = 000 mm l1 ≥ × d ød For the measurement of the diameter d see 6.1.1 IEC Minimum insertion loss in decibels for octave bands a a 125 Hz 250 Hz 500 Hz kHz kHz kHz kHz 20 20 20 20 20 20 Insertion loss measured according to ISO 7235 Figure 101 – Standard load for cooking fume extractors Dimensions in millimetres Resilient means 50 35 60 600 200 35 900 100 50 250 Resilient means IEC Figure 102 – Example of standard stand BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 – 15 – Dimensions in millimetres l3 l2 1,5 × d 90° External fan l1 Muffler according to the manufacturer’s instructions, if a muffler is provided The connections shall not interfere with the air flow to avoid any additional noise or pressure drop Pipe with smooth inner walls l1 + l2 + l3 = 000 mm l1 ≥ × d ød For the measurement of the diameter d see 6.1.1 IEC Minimum insertion loss in decibels for octave bands a a 125 Hz 250 Hz 500 Hz kHz kHz kHz kHz 20 20 20 20 20 20 Insertion loss measured according to ISO 7235 Figure 103 – Standard load for cooking fume extractors with an external fan – 16 – Annexes The annexes of Part are applicable except as follows: Annex A (normative) This annex of Part is not applicable _ BS EN 60704-2-13:2017 IEC 60704-2-13:2016 © IEC 2016 This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Reproducing extracts We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based 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