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Class II, type A2 this cabinet is vented. 30% of the air is exhausted from the cabinet while 70% is recirculated. This cabinet may be used with etiologic agents treated with minute quantities of toxic chemicals and trace quantities of radionuclides that will not interfere with work if recirculated in the down flow air.
The Type A2 cabinet, has a minimum inflow velocity of 90+-20 ft/min. A negative air pressure plenum surrounds all contaminated plenums that are under positive pressure.