二级生物安全柜biosafety cabinet工作原理示意图

30%外排,70%内循环

Class II Type A1 BSC Characteristics
二级A1型生物安全柜特性
Exhaust approximately 30% of total air handled and recirculate 70% in cabinet
30%外排,70%内循环
Minimum inflow air velocity is 75 fpm (0.38 m/s) through the front opening
May exhaust HEPA filtered air back into the room or through a canopy (to the outdoors)
Audiovisual alarm required when connected to a building exhaust system
May have contaminated ducts and plenums under positive pressure to the room 
Type A1 cabinets are not suitable for work with volatile toxic chemical and volatile radionuclides.

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