Classification of Bio-Safety Cabinets

Class II biosafety cabinets provide protection to both sample and personnel working in the work space. Work space is protected with HEPA filtered sterile air where the biological product handled

Class II BSCs are further divided into four types depending on the exhaust system and the mechanism of work (recirculation of the exhaust air); Type A1, Type A2, Type B1, and Type B2.

Type A1/A2 – Re-circulated air back into the laboratory. A1 & A2 are similar but differentiated by the minimum average inflow velocity (FPM). A1 cabinets have minimum average inflow velocity of 75 FPM; Where A2 cabinets have minimum average inflow velocity of 100 FPM above the work station.

Type B1/B2 – B1-Re-circulates a percentage of air into laboratory. B2 cabinets are entirely hard ducted to atmosphere.