BS 4979-2:1974
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Aerodynamic testing of variable flow rate assemblies without a heat exchangerMethods for testing and rating air control devices for air distribution systems
Hardcopy
23-07-2013
English
22-07-1974
Deals with the testing of the variable flow rate control characteristics (using a simulated external signal) and casing and damper leakage, as well as (in the case of dual duct variable flow rate boxes) the efficiency of mixing following the transition from variable flow rate, and the flow proportioning damper.
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