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U.S. and foreign test standards for air filters used in general ventilation and as prefilters for high efficiency filters. are described. These existing standards provide means for comparing and ranking filters, but do not provide the complete information needed by air-handling system designers who need to meet specific requirements, or who want to minimize system costs and energy use. Better information about filter service life, quicker tests, and ones which are not dependent on random atmospheric dust are all needed. Committees of the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) and the U.S. Department of Energy (DOE) are addressing these problems, and will add particle-size-penetration measurement to the codes.
air filter testing, efficiency, dust loading, resistance, penetration, ventilation air filters
Rivers, Richard D.
vice-president, Environmental Quality Sciences, Inc., Louisville, KY
Murphy, David J.
president, Air Filter Testing Laboratories, Inc., Crestwood, KY