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.