Air showers are used at the entrance of dust-free premises. A high-velocity clean air bath is created inside an air shower chamber to remove dust particles from the human body, clothes, and material if carried out through the air shower. It is a barrier by door interlocking between internal  & external environment to avoid the dust. It is used as a recovery unit also in the gold industry. Gold dust trapped in The HEPA filter is recovered by burning the HEPA filter.