MFF biological safety cabinet is a primary engineering control used to protect personnel against biohazardous or infectious agents and to help maintain quality control of the material being worked with as it filters both the inflow and exhaust air. It is sometimes referred to as a laminar flow or tissue culture hood.
These filtered cabinets are primarily designed to protect against exposure to particulates or aerosols. A portion of the air in MFF biological safety cabinet is recirculated back into the lab through its exhaust HEPA filter. This purifies the air of potentially infectious aerosols, animal dander, or both but does not reduce exposure to chemicals.