Achieving "excellent" indoor air quality in commercial offices equipped with air-handling unit - respirable suspended particulate

The feasibility of achieving ultra low respirable suspended particulates (RSP) in commercial offices without major modification of existing ventilation systems by enhancing the particulates removal effiiency of existing central ventilation systems was investigated . For that study , four types of filter were tested in a commercial building located the North shore of Hong Kong Island. The field observations show that indoor RSP can be lowered satisfactorily by the simultaneous filtration of outdoor air and return air.