Bio Safety Cabinet


 
BIOSAFETY CABINETS – SCHEMATIC
 
Comparison table
BSC
Class
Face
Velocity
Airflow Pattern Nonvolatile ToxicChemicals andRadionuclides Volatile ToxicChemicals andRadionuclides
II, A 75
70% recirculated to the cabinet work area through HEPA; 30% balance can be exhausted through HEPA back into the room or to the outside through a thimble unit

YES NO
II, B1 100
Exhaust cabinet air must pass through a dedicated duct to the outside through a HEPA filter

YES YES (minute amounts(2))
II, B2 100
No recirculation; total exhaust to the outside through hard-duct and a HEPA filter

YES YES (small amounts)
II, B3 100
Same as II, A, but plenums are under negative pressure to room; exhaust air is thimble-ducted to the outside through a HEPA filter

YES YES (minute amounts(2))
III N/A
Supply air inlets and hard-duct exhausted to outside through two HEPA filters in series

YES YES (small amounts)
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