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  • EN ISO 7235:2009

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    Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss (ISO 7235:2003)

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    Language(s): 

    Published date:  05-08-2009

    Publisher:  Comite Europeen de Normalisation

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Introduction
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Symbols
    5 Test facilities and requirements for instrumentation
      5.1 Purpose and types of test facilities
      5.2 Equipment for acoustic testing of silencers
      5.3 Equipment for acoustic testing of air-terminal
          units
      5.4 Equipment for flow testing
      5.5 Equipment for dynamic testing
    6 Test procedures
      6.1 General
      6.2 Insertion loss
      6.3 Transmission loss
      6.4 Sound power level of the flow noise (or regenerated
          sound)
      6.5 Volume flow rate and pressure loss coefficient
    7 Information to be recorded
      7.1 Description of the test object
      7.2 Instrumentation
      7.3 Sound-source equipment
      7.4 Test, substitution and transmission ducts
      7.5 Transitions
      7.6 Anechoic termination
      7.7 Reverberation room
      7.8 Acoustical test results
      7.9 Measurement uncertainty
    8 Information to be reported
    Annex A (normative) - Design of the sound field excitation
                             equipment and qualification tests
    Annex B (normative) - Transmission element
    Annex C (normative) - Duct walls and limiting insertion
                             loss
    Annex D (normative) - Conversion of one-third-octave-band
                             attenuation values to octave-band
                             attenuation values
    Annex E (normative) - Measurements on large parallel-baffle
                             silencers
    Annex F (normative) - Test of longitudinal attenuation
    Annex G (informative) - Anechoic terminations
    Annex H (informative) - Examples of measurement arrangements
    Annex ZA (informative) - Relationship between this European Standard
                             and the Essential Requirements of EU
                             Directive 98/37/EC
    Annex ZB (informative) - Relationship between this European Standard
                             and the Essential Requirements of EU
                             Directive 2006/42/EC
    Bibliography

    Abstract - (Show below) - (Hide below)

    ISO 7235:2003 specifies methods for determiningthe insertion loss, in frequency bands, of ducted silencers with and without airflow,the sound power level, in frequency bands, of the flow noise (or regenerated sound) generated by ducted silencers,the total pressure loss of silencers with airflow, andthe transmission loss, in frequency bands, of air-terminal units.The measurement procedures are intended for laboratory measurements at ambient temperature. Measurements on silencers in situ are specified in ISO 11820.It is to be noted that the results determined in a laboratory according to ISO 7235:2003 will not necessarily be the same as those obtained in situ (installation), as different sound and flow fields will yield different results. For example, the pressure loss will be lower under laboratory conditions than in situ, but will be comparable between different laboratories.ISO 7235:2003 is applicable to all types of silencer including silencers for ventilating and air-conditioning systems, air intake and exhaust of flue gases, and similar applications. Other passive air-handling devices, such as bends, air-terminal units or T-connectors, can also be tested using this International Standard.It is not applicable to reactive silencers used for motor vehicles.

    General Product Information - (Show below) - (Hide below)

    Committee CEN/TC 211
    Document Type Standard
    Publisher Comite Europeen de Normalisation
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    17/30332536 DC : 0 BS EN 13141-5 - VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 5: COWLS AND ROOF OUTLET TERMINAL DEVICES
    CEI EN 60704-2-10 : 2012 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-10: PARTICULAR REQUIREMENTS FOR ELECTRIC COOKING RANGES, OVENS, GRILLS, MICROWAVE OVENS AND ANY COMBINATION OF THESE
    CEI EN 60704-2-6 : 2013 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-6: PARTICULAR REQUIREMENTS FOR TUMBLE DRYERS
    BS EN 60704-2-13:2017 Household and similar electrical appliances. Test code for the determination of airborne acoustical noise Particular requirements for range hoods and other cooking fume extractors
    BS EN 13141-2:2010 VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 2: EXHAUST AND SUPPLY AIR TERMINAL DEVICES
    EN 13141-2:2010 Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 2: Exhaust and supply air terminal devices
    EN 60704-2-6:2012 Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-6: Particular requirements for tumble dryers
    EN 12354-5:2009/AC:2010 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDING FROM THE PERFORMANCE OF ELEMENTS - PART 5: SOUNDS LEVELS DUE TO THE SERVICE EQUIPMENT
    PREN 13141-5 : DRAFT 2017 VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 5: COWLS AND ROOF OUTLET TERMINAL DEVICES
    PREN 13053 : DRAFT 2017 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    I.S. EN 60704-2-6:2012 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-6: PARTICULAR REQUIREMENTS FOR TUMBLE DRYERS (IEC 60704-2-6:2012 (EQV))
    I.S. EN 13053:2006 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    NF EN 13053 : 2006 + A1 2011 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATINGS AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    DIN EN 12354-5:2009-10 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDING FROM THE PERFORMANCE OF ELEMENTS - PART 5: SOUNDS LEVELS DUE TO THE SERVICE EQUIPMENT
    UNE-EN 60704-2-10:2012 Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-10: Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these
    UNE-EN 60704-2-6:2013 Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-6: Particular requirements for tumble dryers
    DIN EN 13053:2012-02 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS (INCLUDES AMENDMENT A1:2011)
    DIN EN 13141-2:2010-12 Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 2: Exhaust and supply air terminal devices
    I.S. EN 13141-2:2010 VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 2: EXHAUST AND SUPPLY AIR TERMINAL DEVICES
    CEI EN 60704-2-13 : 2012 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
    BS EN 60704-2-10:2011 Household and similar electrical appliances. Test code for the determination of airborne acoustical noise Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these
    BS EN 60704-2-6:2012 Household and similar electrical appliances. Test code for the determination of airborne acoustical noise Particular requirements for tumble dryers
    ISO 15712-4:2005 Building acoustics Estimation of acoustic performance of buildings from the performance of elements Part 4: Transmission of indoor sound to the outside
    UNE-EN 13141-2:2011 Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 2: Exhaust and supply air terminal devices
    BS EN 13053 : 2006 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    UNE-EN 60704-2-13:2017 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
    UNI EN 13141-2 : 2010 VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 2: EXHAUST AND SUPPLY AIR TERMINAL DEVICES
    UNI EN 12354-5 : 2009 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDING FROM THE PERFORMANCE OF ELEMENTS - PART 5: SOUNDS LEVELS DUE TO THE SERVICE EQUIPMENT
    EEMUA 161 : 2014 SILENCERS AND ACOUSTIC ENCLOSURES - GUIDE TO SELECTION AND ASSESSMENT
    I.S. EN 12354-4:2000 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE
    03/316891 DC : DRAFT OCT 2003 EN 13053 - VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATINGS AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    17/30339487 DC : 0 BS EN 13053 - VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    16/30344387 DC : 0 BS EN 16475-1 - CHIMNEYS - ACCESSORIES - PART 1: CHIMNEY SILENCERS - REQUIREMENTS AND TEST METHODS
    I.S. EN 60704-2-10:2011 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-10: PARTICULAR REQUIREMENTS FOR ELECTRIC COOKING RANGES, OVENS, GRILLS, MICROWAVE OVENS AND ANY COMBINATION OF THESE (IEC 60704-2-10:2011 (EQV))
    BS EN 12354-4:2000 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE
    ISO 14163:1998 Acoustics — Guidelines for noise control by silencers
    UNI EN 13053 : 2011 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    BS EN 12354-5:2009 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDING FROM THE PERFORMANCE OF ELEMENTS - PART 5: SOUNDS LEVELS DUE TO THE SERVICE EQUIPMENT
    BS EN ISO 14163:1998 Acoustics. Guidelines for noise control by silencers
    EN ISO 14163 : 1998 ACOUSTICS - GUIDELINES FOR NOISE CONTROL BY SILENCERS
    16/30334506 DC : 0 BS EN ISO 12354-4 - BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE
    I.S. EN 60704-2-13:2017 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
    EN 13053:2006+A1:2011 Ventilation for buildings - Air handling units - Rating and performance for units, components and sections
    EN 12354-4:2000 Building Acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 4: Transmission of indoor sound to the outside
    EN 60704-2-13:2017 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
    EN 60704-2-10:2011 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-10: PARTICULAR REQUIREMENTS FOR ELECTRIC COOKING RANGES, OVENS, GRILLS, MICROWAVE OVENS AND ANY COMBINATION OF THESE (IEC 60704-2-10:2011)

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions
    ISO 11200:2014 Acoustics Noise emitted by machinery and equipment Guidelines for the use of basic standards for the determination of emission sound pressure levels at a work station and at other specified positions
    EN 12238:2001 Ventilation for buildings - Air terminal devices - Aerodynamic testing and rating for mixed flow application
    IEC 60942:2003 Electroacoustics - Sound calibrators
    ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a standard measurement method
    ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
    ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results Part 4: Basic methods for the determination of the trueness of a standard measurement method
    2006/42/EC : 2006 AMD 4 2014 DIRECTIVE 2006/42/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF 17 MAY 2006 ON MACHINERY, AND AMENDING DIRECTIVE 95/16/EC (RECAST) (TEXT WITH EEA RELEVANCE)
    ISO 11820:1996 Acoustics — Measurements on silencers in situ
    BS 4718:1971 Methods of test for silencers for air distribution systems
    ISO 3746:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane
    ISO 5135:1997 Acoustics Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room
    ISO 5167-1:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements
    ISO 9614-3:2002 Acoustics Determination of sound power levels of noise sources using sound intensity Part 3: Precision method for measurement by scanning
    EN 12239:2001 Ventilation for buildings - Air terminal devices - Aerodynamic testing and rating for displacement flow applications
    ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
    ISO 14163:1998 Acoustics — Guidelines for noise control by silencers
    ISO 3741:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms
    ISO 5221:1984 Air distribution and air diffusion Rules to methods of measuring air flow rate in an air handling duct
    1998/37/EC : 1998 DIRECTIVE 98/37/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF 22 JUNE 1998 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO MACHINERY
    IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
    EN 12589:2001 Ventilation for buildings - Air terminal units - Aerodynamic testing and rating of constant and variable rate terminal units
    ISO 3966:2008 Measurement of fluid flow in closed conduits Velocity area method using Pitot static tubes
    ISO 5136:2003 Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method
    ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results — Part 5: Alternative methods for the determination of the precision of a standard measurement method
    IEC 60651:1979+AMD1:1993+AMD2:2000 CSV Sound level meters
    IEC 60804:2000 Integrating-averaging sound level meters
    View more information

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