RHM Consultant Sdn. Bhd. (380905-V)
General Ventilation Testing
Face velocities at air inlets and outlets/suction are measured using air velocity meter at a few points for each outlet/inlets, average calculated and multiply with the surface area of inlets/outlets to get the volume of air supplied/exhausted. The total air supplied per hour for each room divided by the volume of the room and multiply by measured % fresh air, give the number of air change-recommended minimum air change is 8-12 for a laboratory.