This is the type of filtration that used air to achieve a certain filtration goal. These happen to be one of the common practices in most of the laboratories. These method of filtration used a sealed limited flow cabinets to produce a sterile fluid plates, the cabinet is made in such a way that air are blow into the cabinet through the HEPA filter a fibreglass filter, these fibreglass filter is used to extract particle from the air. These happen by laying an ambush along a tiny tortous path, this type of filter required routine checking because of blockage. By checking, the air flowmeter is used also it can be determined by examine counting particle of the cabinet.
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