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...University of pittsburgh eh s guideline number safety manual subject effective date biological cabinets page properly maintained and utilized bsc provide containment for the safe manipulation potentially infectious agents a sterile work environment protection experimental material high efficiency particulate air hepa filters are installed on exhaust plenum bscs to protect worker filtering supply within protects research materials from room contaminants only listed in latest edition national sanitation foundation nsf standard class ii laminar flow biohazard cabinetry shall be purchased is available consult selection location biosafety cabinet terminology i no longer manufactured regular basis usage existing should limited low risk which not necessary front opening with inward personnel filtered vertical environmental divided into types or b type formerly designated as utilize design recirculated area through filter balance can exhausted back outside via canopy connection function same e...