LARGE-SCALE FACILITY FOR MEASURING AIR-FLOW RESISTANCE, AIR-LEAKAGE RATES, AND MECHANICAL FAN PERFORMANCE
This facility can determine the air-flow resistance of large- scale ventilation devices such as roof terminals, wall and window units, etc, of up to approximately 1 m square in size, and mechanical fans of up to approximately 0.75 m in diameter. It has been designed in accordance with BS 848. From the information recorded, accurate determination of discharge coefficients, Cd can be made for individual products. Volumetric air flow rates of 0.1-10 m3/s can be achieved (calibrated cones) and pressure differentials of 1-150 Pa; air density corrections are applied according to prevailing environmental conditions.