Selection of Biological Safety Cabinet (BSC)
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Catagory
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Laboratory Type
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Type of Protection
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Class I
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Group 1-3, microorganisms in Risk;
Slightly volatile, radionuclide/chemical protection
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Operator, Environment
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Class II A1
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Group 1-3, microorganisms in Risk
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Operator, Environment, Product
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Class II A2
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Group 1-3, microorganisms in Risk
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Operator, Environment, Product
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Class II B1
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Group 1-3, microorganisms in Risk;
Slightly volatile, radionuclide/chemical protection
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Operator, Environment, Product
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Class II B2
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Group 1-3, microorganisms in Risk;
Minute amounts volatile, radionuclide/chemical protection
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Operator, Environment, Product
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Class III
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Group 1-3, microorganisms in Risk;
Volatile, radionuclide/chemical protection
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Operator, Environment, Product
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BSC Grades
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Inlet Air Velocity
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% of Airflow
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m/s
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Internal Recirculation
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Exhausted
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Class I
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0.38
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0
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100
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BSC Grades
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Inlet Air Velocity
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% of Airflow
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m/s
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Internal Recirculation
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Exhausted
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Class II A1
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0.38
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70
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30
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Class II A2
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0.5
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70
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30
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Class II B1
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0.5
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30
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70
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Class II B2
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0.5
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0
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100
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BSC Grades
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Inlet Air Velocity
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% of Airflow
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m/s
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Internal Recirculation
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Exhausted
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Class III
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N/A
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0
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100
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