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...Biological safety cabinet document number management program ehs bsc effective date revision purpose and applicability the following describes proper procedures for working in a biosafety as well annual certification requirements these must be followed properly by all who own work this covers types of cabinets techniques them also offers guidance selecting new decommissioning old equipment several important topics specific to definitions is primary barrier protection individuals with biohazardous materials laboratory that could create airborne biohazards should always performed it protects workers environment from aerosols or droplets spread material common element classes high efficiency particulate air hepa filter removes particles aerodynamic diameters microns most penetrating particle size an percent both larger smaller than which includes majority bacteria viruses are removed virtually note however filters do not remove vapors gases laminar flow clean benches devices look similar ...