Etration of Submicron Aerosols Through High-efficiency Air Filters

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Abstract
Penetration through high-efficiency air filters was measured using dioctyl phthalate (DOP) particles and ambient particles. The tested filters were a Whatman GF/A filter and a Oshitari SO filter, one of the media used in high-efficiency particulate air (HEPA) filters. The particle concentration measurements were made with an automated diffusion battery (DB)/condensation nucleus counter (CNC) submicron-sizing system and a laser-particle spectrometer. The most penetrating particle sizes through both the GF/A filter and the SO filter were in a size range from 0.10-0.18 .mu.m in diameter. The values of penetration through the GF/A filter by 2 different particle-measuring methods, the combined CNC/DB system and the laser-particle spectrometer, were consistent with each other in the limited size range from 0.12-0.42 .mu.m. No significant difference between the penetration curve of DOP particles and that of ambient particles was observed.

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