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Filtration efficiency of selected HVAC filters.
Moyer E; Commodore M; Hayes J; Fotta S
American Industrial Hygiene Conference and Exposition, June 1-6, 2002, San Diego, California. Fairfax, VA: American Industrial Hygiene Association, 2002 Jun; :25
Air quality begins with good engineering controls in the air handling system (HVAC system). For particulate matter this involves having an air handler containing filters which remove the majority of particulate matter from the incoming ambient air. The National Institute for Occupational Safety and Health (NIOSH) has conducted a study of various bag filters used in its air handler to determine the micrometer particles (0.03-0.4 micrometers) because this is the most penetrating size range for these filters. Experimental aerosol penetration data shows that an extremely large range of filter efficiency exists. Aerosol penetration through new filters ranged from less than one percent to greater than ten percent were observed. The values depend on flow rate, surface area of the media, challenge agent particle size, and challenge agent state (liquid or solid). Filters which were removed from the filter bank were also tested to determine the effect of routine inlet air exposure.
Filters; Filtration; Air-quality-control; Engineering-controls; Particulates; Aerosols; Exposure-levels
Research Tools and Approaches: Control Technology and Personal Protective Equipment
American Industrial Hygiene Conference and Exposition, June 1-6, 2002, San Diego, California
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division