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A clean room is an environment, typically used in manufacturing or scientific research, with a low level of environmental pollutants such as dust, airborne microbes, aerosol particles, and chemical vapors. A clean room has a controlled level of contamination that is specified by the number of particles per cubic meter at a specified particle size.
Clean rooms are generally large. Entire manufacturing facilities can be contained within a clean room with factory floors covering thousands of square meters. They are used extensively in semiconductor manufacturing, biotechnology, the life sciences, and other fields that are very sensitive to environmental contamination.
The air entering a clean room from outside is filtered to exclude dust, and the air inside is constantly re-circulated through high-efficiency particulate air (HEPA) and/or ultra-low penetration air (ULPA) filters to remove internally generated contaminants.
Clean rooms maintain particulate-free air through the use of either HEPA or ULPA filters employing laminar or turbulent air flow principles. Laminar, or unidirectional, air flow systems direct filtered air downward in a constant stream towards filters located on walls near the clean room floor or through raised perforated floor panels to be re-circulated.
Laminar air flow systems are typically employed across 80% of a clean room ceiling to maintain constant air processing. Stainless steel or other non shedding materials are used to construct laminar air flow filters and hoods to prevent excess particles entering the air.
Turbulent, or non-unidirectional, air flow uses both laminar air flow hoods and nonspecific velocity filters to keep air in a clean room in constant motion, although not all in the same direction. The rough air seeks to trap particles that may be in the air and drive them towards the floor, where they enter filters and leave the clean room environment.
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