Air shower (room)
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Air showers are specialised antechambers which personnel need to pass through before entering cleanrooms in order to decontaminate. This is done so by clearing off dust and dirt particles from bodies of cleanroom personnel to minimize contamination of equipment or products. HEPA filters are generally used in air shower units to filter out particles greater than 0.3 micrometres in size.
There are various possible designs to an air shower unit, for example, single-side shower, double-side shower, three-side shower as well as top shower. Spraying wind speed is around 25 m/s or above through stainless steel nozzles.
As a percentage of the total cost of the modern cleanroom, the cost of an air shower installation is considered minor. In various fields where sterile conditions are critical- for example, life science and biomedical research, pharmaceutical, parenteral drug, microelectronics, aerospace and precision manufacturing—air showers are considered essential equipment.
Due to the requirement of near sterile conditions in cleanrooms, air showers are used to decontaminate by blasting dirt and dust particles off personnel entering the place. The pollutants carried by personnel can affect special equipment. Their use can potentially eliminate contamination and in turn prevent loss of important manufacturing, such as expensive batches of pharmaceutical chemicals and semiconductor wafers. Thus, air showers are common in many factories where sterile conditions are needed.