Air Showers are self-contained chambers installed at entrances to cleanrooms and other controlled environments. They minimize particulate matter entering or exiting the clean space. Personnel and materials entering or exiting the controlled environment are "scrubbed" by high velocity HEPA- or ULPA-filtered air to remove dust, fibrous lint and other contaminants from personnel or object surfaces. Contaminated air is then drawn through the base within the unit, filtered and recirculated. When properly integrated in the design of the cleanroom, air showers provide an ISO classified transition area ensuring cleanroom cleanliness is maintained.