Coordinate and analyze interlaboratory testing of filters under ASHRAE standard 52.2 to determine the adequacy of the apparatus qualification tests. Final Report
Under contract with the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE, Project No. 1088-RP), RTI conducted an interlaboratory study (ILS) of ANSI/ASHRAE Standard 52.2-1999. The standard presents procedures for measuring the filtration efficiency of general ventilation filters over the particle diameter size range from 0.3 to<br>10 ?m in 12 particle diameter size ranges. The filter is first evaluated in its clean condition for filtration efficiency and initial pressure drop. The filtration efficiency of the filter is then evaluated after each of five dust loading steps. From these efficiency measurements and measurements of filter pressure drop, composite efficiency values (the E1, E2 and E3 values of the standard) and the Minimum Efficiency Reporting Value (MERV) are derived. A complete 52.2 test (initial efficiency and efficiency after each of 5 dust loading steps) takes approximately 8 – 16 hours to complete and may span more than one day.