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Fan Filter Unit Market - Global Industry Analysis, Share by 2031 A fan filter unit (FFU) is a kind of motorized air filtering equipment. It is used to supply purified air to cleanrooms, laboratories, medical facilities, or microenvironments by removing harmful airborne particles from recirculating air. The units are installed within the system's ceiling or floor grid. Large cleanrooms need a proportionally large number of FFUs, which in some cases may range from several hundred to several thousand