Cleanair™ Air showers are self-contained air chambers installed at the entrance of clean rooms in order to keep the clean room sanitized by minimizing the amount of particulate contamination entering the clean room. Equipment and materials are sanitized by passing through the air shower pass box while particulate contamination is removed by washing with high velocity HEPA-filtered air jets. Contaminated air is then taken in through the base of the unit, filtered, and re-circulated into the chamber. To facilitate the proper removal of particulate contamination, Cleanair Air Showers are built-to-order with standard shower duration of at least 15 seconds.