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Class II Type A1 BSC Characteristics
- Exhaust approximately 30% of total air handled and recirculate 70% in cabinet
- 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
 
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