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  • BS 4979:1986

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Methods for aerodynamic testing of constant and variable dual or single duct boxes, single duct units and induction boxes for air distribution systems

    Available format(s):  Hardcopy, PDF

    Withdrawn date:  01-12-2003

    Language(s):  English

    Published date:  30-04-1986

    Publisher:  British Standards Institution

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

    Foreword
    Committees responsible
    Specification
    1. Scope
    2. Definitions
    3. Summary of tests
    4. Symbols and suffixes
    5. Instrumentation
    6. Leakage tests
    7. Test for flow rate control
    8. Boxes with variable rate of air flow at constant
        inlet pressure
    9. Test for flow rate characteristics of single duct
        units
    10. Test for temperature mixing efficiency of dual
        duct boxes
    11. Tests for induction boxes
    Tables
    1. Symbols
    2. Ranges and accuracies of measurement of air flow
        meters not employed for determining leakage rate
    3. Ranges and accuracies of measurement of air flow
        meters for determining leakage rate
    4. Pressure measuring instruments: range, accuracy
        and scale intervals
    5. Pressure differentials
    Figures
    1. Leakage test, air supply duct
    2. Typical air supply arrangement for tests on single
        duct boxes and/or units
    3. Typical air supply arrangement for tests on dual
        duct boxes
    4. Examples of the determination of 'minimum pressure
        differential'
    5. Typical graph resulting from tests described in 8.4
    6. Typical graph for tests on a single duct unit
    7. Typical air supply arrangement for mixing efficiency
        tests showing location of instrumentation
    8. Mixing efficiency: typical outlet duct arrangement
        (single outlet)
    9. Mixing efficiency: points of temperature measurement
        in outlet extension duct of multiple outlet box
    10. Typical induction box test installation

    Abstract - (Show below) - (Hide below)

    Methods of test for casing leakage, valve and damper leakage, flow rate control, temperature mixing, induction flow rate and pressure requirements.

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

    Committee RHE/2
    Document Type Standard
    Publisher British Standards Institution
    Status Withdrawn
    Supersedes

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

    BS 1042-1.1(1981) : 1981 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - SPECIFICATION FOR SQUARE-EDGED ORIFICE PLATES, NOZZLES AND VENTURI TUBES INSERTED IN CIRCULAR CROSS SECTION CONDUITS RUNNING FULL
    BS 1042-2.1:1983 Measurement of fluid flow in closed conduits. Velocity area methods Method using Pitot static tubes
    BS 1042-1.2(1984) : LATEST SPEC. FOR SQUARE-EDGED ORIFICE PLATES, NOZZLES (WITH DRAIN HOLES, IN PIPES BELOW 50MM DIAMETER, AS INLET AND OUTLET DEVICES) AND OTHER ORIFICE PLATES AND BORDA INLETS
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