HEPA filters

According to the NAFA Guide to Air Filtration (1993), the Institute of Environmental Sciences (IES) defines a HEPA filter as "a throw-away extended-media dry-type filter in a rigid frame, having minimum particle-collection efficiency of 99.97% for 0.3 micrometer (micron) thermally-generated dioctyl phthalate (DOP) particles or specified alternative aerosol, and a maximum clean-filter pressure drop of ... 1.0 in w.g. when tested at rated air flow capacity." The NAFA Guide offers the following general description of HEPA filters,

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