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  • ISO 7235:2003

    Current The latest, up-to-date edition.

    Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English, French

    Published date:  28-08-2003

    Publisher:  International Organization for Standardization

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    Abstract - (Show below) - (Hide below)

    ISO 7235:2003 specifies methods for determining

    • the 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, and
    • the 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 ISO/TC 43/SC 1
    Development Note Supersedes ISO/DIS 7235 (08/2003)
    Document Type Standard
    Publisher International Organization for Standardization
    Status Current
    Supersedes

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

    16/30315262 DC : 0 BS EN 60704-2-13 ED 3.0 - HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-13: PARTICULAR REQUIREMENTS FOR RANGE HOODS AND OTHER FUME EXTRACTORS
    12/30257842 DC : 0 BS ISO 27327-2 - FANS - AIR CURTAIN UNITS - PART 2: LABORATORY METHODS OF TESTING FOR SOUND POWER
    BS 848-2.2(2004) : 2004 INDUSTRIAL FANS - DETERMINATION OF FAN SOUND POWER LEVELS UNDER STANDARDIZED LABORATORY CONDITIONS - PART 2: REVERBERANT ROOM METHOD
    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
    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
    17/30356593 DC : 0 BS EN ISO 15138 - PETROLEUM AND NATURAL GAS INDUSTRIES - OFFSHORE PRODUCTION INSTALLATIONS - HEATING, VENTILATION AND AIR-CONDITIONING
    BS 848-2.1(2004) : 2004 INDUSTRIAL FANS - DETERMINATION OF FAN SOUND POWER LEVELS UNDER STANDARDIZED LABORATORY CONDITIONS - PART 1: GENERAL OVERVIEW
    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 ISO 15138:2007 Petroleum and natural gas industries. Offshore production installations. Heating, ventilation and air-conditioning
    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
    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
    UNI EN ISO 15138 : 2008 PETROLEUM AND NATURAL GAS INDUSTRIES - OFFSHORE PRODUCTION INSTALLATIONS - HEATING, VENTILATION AND AIR-CONDITIONING
    ISO 15138:2007 Petroleum and natural gas industries Offshore production installations Heating, ventilation and air-conditioning
    DIN EN ISO 12354-4 E : 2017 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE (ISO 12354-4:2017)
    BS EN 13141-2:2010 Ventilation for buildings. Performance testing of components/products for residential ventilation Exhaust and supply air terminal devices
    BS EN ISO 11691:1997 Acoustics. Measurement of insertion loss of ducted silencers without flow. Laboratory survey method
    BS EN ISO 11690-2:1997 Acoustics. Recommended practice for the design of low-noise workplaces containing machinery Noise control measures
    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
    I.S. EN ISO 11691:2009 ACOUSTICS - MEASUREMENT OF INSERTION LOSS OF DUCTED SILENCERS WITHOUT FLOW - LABORATORY SURVEY METHOD
    DIN EN ISO 11691:2010-01 Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995); German version EN ISO 11691:2009
    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
    ONORM EN 12354-5 : 2011 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDING FROM THE PERFORMANCE OF ELEMENTS - PART 5: SOUNDS LEVELS DUE TO THE SERVICE EQUIPMENT
    I.S. 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
    10/30210548 DC : 0 BS EN 60704-2-13 ED 2.0 - HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-13: PARTICULAR REQUIREMENTS FOR RANGE HOODS
    BS ISO 27327-2:2014 Fans. Air curtain units Laboratory methods of testing for sound power
    11/30244467 DC : 0 BS EN 60704-2-6 - HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES - TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE - PART 2-6: PARTICULAR REQUIREMENTS FOR TUMBLE DRYERS
    PREN 13141-5 : DRAFT 2017 VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 5: COWLS AND ROOF OUTLET TERMINAL DEVICES
    UNI ISO 13347-1 : 2009 INDUSTRIAL FANS - DETERMINATION OF FAN SOUND POWER LEVELS UNDER STANDARDIZED LABORATORY CONDITIONS - PART 1: GENERAL OVERVIEW
    08/30175518 DC : DRAFT SEP 2008 BS EN 13141-2 - VENTILATION FOR BUILDINGS - PERFORMANCE TESTING OF COMPONENTS/PRODUCTS FOR RESIDENTIAL VENTILATION - PART 2: EXHAUST AND SUPPLY AIR TERMINAL DEVICES
    PREN 13053 : DRAFT 2017 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    BS ISO 13347-1 : 2004 INDUSTRIAL FANS - DETERMINATION OF FAN SOUND POWER LEVELS UNDER STANDARDIZED LABORATORY CONDITIONS - PART 1: GENERAL OVERVIEW
    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))
    IEC 60704-2-13:2016 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
    I.S. EN 13053:2006 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING 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
    ISO 5136:2003 Acoustics — Determination of sound power radiated into a duct by fans and other air-moving devices — In-duct method
    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
    I.S. EN ISO 5136:2009 ACOUSTICS - DETERMINATION OF SOUND POWER RADIATED INTO A DUCT BY FANS AND OTHER AIR-MOVING DEVICES - IN-DUCT METHOD
    UNI EN ISO 11691 : 2009 ACOUSTICS - MEASUREMENT OF INSERTION LOSS OF DUCTED SILENCERS WITHOUT FLOW - LABORATORY SURVEY METHOD
    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
    EN ISO 11691:2009 Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)
    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
    10/30230561 DC : 0 BS EN 60704-2-10 - 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
    I.S. EN ISO 15138:2007 PETROLEUM AND NATURAL GAS INDUSTRIES - OFFSHORE PRODUCTION INSTALLATIONS - HEATING, VENTILATION AND AIR-CONDITIONING
    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
    06/30127203 DC : DRAFT OCT 2006 ISO 15138 - PETROLEUM, PETROCHEMICAL AND NATURAL GAS INDUSTRIES - OFFSHORE PRODUCTION INSTALLATIONS - HEATING, VENTILATION AND AIR CONDITIONING
    03/316891 DC : DRAFT OCT 2003 EN 13053 - VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATINGS AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    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
    BS ISO 13347-2:2004 Industrial fans. Determination of fan sound power levels under standardized laboratory conditions Reverberant room method
    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 ISO 5136:2010 Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003)
    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
    I.S. EN ISO 5135:1999 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE FROM AIR-TERMINAL DEVICES, AIR-TERMINAL UNITS, DAMPERS AND VALVES BY MEASUREMENT IN A REVERBERATION ROOM
    EN ISO 5135 : 1998 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE FROM AIR-TERMINAL DEVICES, AIR-TERMINAL UNITS, DAMPERS AND VALVES BY MEASUREMENT IN A REVERBERATION ROOM
    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 ISO 5136 : 2009 ACOUSTICS - DETERMINATION OF SOUND POWER RADIATED INTO A DUCT BY FANS AND OTHER AIR-MOVING DEVICES - IN-DUCT METHOD
    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
    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
    BS EN ISO 12354-4:2017 Building acoustics. Estimation of acoustic performance of buildings from the performance of elements Transmission of indoor sound to the outside
    ISO 13347-2:2004 Industrial fans — Determination of fan sound power levels under standardized laboratory conditions — Part 2: Reverberant room method
    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
    EN ISO 15138:2007 Petroleum and natural gas industries - Offshore production installations - Heating, ventilation and air-conditioning (ISO 15138:2007)
    DIN EN ISO 12354-4:2016-03 (Draft) BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE (ISO 12354-4:2017)
    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 ISO 5136:2009 Acoustics. Determination of sound power radiated into a duct by fans and other air-moving devices. In-duct method
    ISO 11691:1995 Acoustics Measurement of insertion loss of ducted silencers without flow Laboratory survey method
    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
    IEC 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
    UNI EN 13053 : 2011 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    ISO 14163:1998 Acoustics — Guidelines for noise control by silencers
    BS EN 12354-5:2009 Building acoustics. Estimation of acoustic performance of building from the performance of elements Sounds levels due to the service equipment
    IEC 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
    ONORM EN 13053 : 2011 VENTILATION FOR BUILDINGS - AIR HANDLING UNITS - RATING AND PERFORMANCE FOR UNITS, COMPONENTS AND SECTIONS
    BS EN ISO 14163:1998 Acoustics. Guidelines for noise control by silencers
    BS EN ISO 11820:1997 Acoustics. Measurements on silencers in situ
    ISO 12354-4:2017 Building acoustics — Estimation of acoustic performance of buildings from the performance of elements — Part 4: Transmission of indoor sound to the outside
    EN ISO 5136:2009 Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003)
    EN ISO 14163 : 1998 ACOUSTICS - GUIDELINES FOR NOISE CONTROL BY SILENCERS
    EN 25136 : 1993 ACOUSTICS - DETERMINATION OF SOUND POWER RADIATED INTO A DUCT BY FANS - IN-DUCT METHOD
    ISO 27327-2:2014 Fans Air curtain units Part 2: Laboratory methods of testing for sound power
    DIN 45646 : 1988 MEASUREMENT PROCEDURES FOR DUCTED SILENCERS; INSERTION LOSS, TRANSMISSION LOSS, FLOW NOISE, TOTAL PRESSURE LOSS
    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
    BS 848-2.5(2003) : 2003 ACOUSTICS - DETERMINATION OF SOUND POWER RADIATED INTO A DUCT BY FANS AND OTHER AIR-MOVING DEVICES - IN-DUCT METHOD
    I.S. EN ISO 12354-4:2017 BUILDING ACOUSTICS - ESTIMATION OF ACOUSTIC PERFORMANCE OF BUILDINGS FROM THE PERFORMANCE OF ELEMENTS - PART 4: TRANSMISSION OF INDOOR SOUND TO THE OUTSIDE (ISO 12354-4:2017)
    UNE-EN ISO 12354-4:2018 Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 4: Transmission of indoor sound to the outside (ISO 12354-4:2017)
    ISO 13347-1:2004 Industrial fans — Determination of fan sound power levels under standardized laboratory conditions — Part 1: General overview
    EN 13053:2006+A1:2011 Ventilation for buildings - Air handling units - Rating and performance for units, components and sections
    UNE-EN 13053:2007 Ventilation for buildings - Air handling units - Rating and performance for units, components and sections
    BS EN 25136:1994 Acoustics. Determination of sound power radiated into a duct by fans. In-duct method
    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)
    EN ISO 12354-4:2017 Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 4: Transmission of indoor sound to the outside (ISO 12354-4:2017)
    DIN EN ISO 5136:2009-11 Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003)

    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
    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
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