Air showers are used to clean particles off personnel before they enter a cleanroom. They are typically used for higher classification cleanrooms (ISO-5 /class 100 cleanrooms, ISO-6 / class 1000 cleanrooms) and are very popular in the semiconductor industry.
Before entering the cleanroom air shower, personnel will gown up to encapsulate any particles they might have on their clothes or body. Depending on the size of the cleanroom air shower, anywhere from 1 to 3 people can open the door and enter. After entering, the cleanroom air shower blows HEPA filtered air on them for 20-40 seconds to remove any particles. Once the cycle is complete, the personnel exit thru the second door into the cleanroom. The doors of the cleanroom air shower are typically interlocked so only one door can be open at a time to prevent particles from entering the cleanroom from the exterior.
The air shower blasts HEPA filtered air thru nozzles in the ceilings and both walls at 8000 feet/minute on the standing personnel. A typical 4’x6’ air shower has 6 nozzles in the ceiling and 11 nozzles on each wall to blast the air. This results in the cleanroom air shower having 800 air changes per hour – more than double the requirement for ISO-5 cleanrooms.
There are different air shower sizes, door opening locations and height.
A cleanroom air shower can be constructed of different materials depending on the industry of the cleanroom (semiconductor cleanroom, pharmaceutical cleanroom, chemical cleanroom, hazardous material cleanroom, or industrial cleanroom).
There are also may be special building code requirements for air showers so options include:
Cleanroom Air Showers Applications:
Air showers are an expensive (starting at $25k each depending on size) but effective way to clean cleanroom personnel. They are most popular in semiconductor industry who typically have large ISO-5 and ISO-6 cleanrooms with many employees going in and out. Beware of lower cost imported air showers that do not have sufficient air velocity and air changes per hour to effectively clean personnel and material.
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