Envirco NSF Biohazard Cabinet - Manual (Page 6)

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Class II, Type A/B3 Cabinets:
1. Meets the requirements of Class II, Type A cabinets when the HEPA filtered
exhaust air is recirculated back to the laboratory.
2. Meets the requirements of Class II, Type B3 cabinets when the exhaust air is
vented to the outside atmosphere after HEPA filtration.
3. Confirms to the requirements for either the Type A or Type B3 cabinet outlined
above.
III. DESCRIPTION
The ENVIRCO Biohazard Cabinet is a Class II, Type A/B3 unit with HEPA filtered
air recirculation, front air barrier and self-contained exhaust. It provides a work area
for safe handling of low to moderate risk biohazard materials. It is designed
primarily for work in microbiology, virology, tissue culture, and sterility testing.
The Biohazard Cabinet
The cabinet protects the worker from airborne contaminants generated within the
work area. It protects the work from airborne contaminants generated in the
ambient air and protects against cross-contamination within the work area. The
cabinet is designed to comply with NSF
1
Standard 49, Class II, Type A and/or B3
Biohazard Cabinetry and bears NSF seal of compliance.
NOTE: The Type A cabinet is suitable for work with low to moderate risk agents.
The Type B3 cabinet is suitable for use with chemical carcinogens and
low toxicity fumes or vapors.
1 NSF International, Ann Arbor, Michigan 48105