Skip to content
Please enter a keyword to search
  • Preview

    I.S. EN ISO 7235:2009

    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

    Language(s):  English

    Published date:  01-01-2009

    Publisher:  National Standards Authority of Ireland

    For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
    Only cited Standards give presumption of conformance to New Approach Directives/Regulations.

    Dates of withdrawal of national standards are available from NSAI.

    Add To Cart

    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
    6 Test procedures
    7 Information to be recorded
    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)

    Applies to all types of silencer including silencers for ventilating and air-conditioning systems, air intake and exhaust of flue gases, and similar applications.

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

    Document Type Standard
    Publisher National Standards Authority of Ireland
    Status Current
    Supersedes

    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
    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

    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective