Understanding the Applications and Uses of Biological Safety Cabinets Class II BSCs use higher air velocities to provide better protection for personnel, the environment and product. The two main types are Class II Type A1 and A2 cabinets. Both have HEPA filtered downward laminar airflow and HEPA filtered exhaust air to protect the environment. The main difference is that Type A1 cabinets recirculate about 70% of the purified air back into the work zone whereas...
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