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.
BS 4979-2:1974
Original price was: $264.16.$132.00Current price is: $132.00.
Methods for testing and rating air control devices for air distribution systems-Aerodynamic testing of variable flow rate assemblies without a heat exchanger
BSI Group , 07/22/1974
