Definitions for "HEPA filter"
Device that removes from the air tiny particles that can irritate the nasal and breathing passages.
High Efficiency Particulate Air filter, which filters out 99.97% of contaminants such as asbestos, lead or mold spores.
High Efficiency Particulate Arrestor.  Cartridge style exhaust filter that traps particles in the .3-micron range.  Typical allergens are in the .5-micron range.  Good for allergies and low dust emissions.
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