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high-efficiency particulate air (HEPA) filter definition

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a replaceable extended media, dry-type filter in a rigid frame and having a minimum particle-collection efficiency of 99.97% on all particles larger than 0.3 micrometer.

See also:

heterolysis, heterolytic definition
heterocyclyl groups definition
High-performance liquid chromatography (HPLC) definition
Heterogeneous Mixture definition
helium (He) definition