BMBL Section I - Introduction Biosafety in Biomedical and Microbiological Laboratories
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Appendix A. Primary Containment: Biological Safety Cabinets

Figure 2c. Class II, Type B2 Biological Safety Cabinet

A. front opening    B. sash    C. exhaust HEPA filter
D. supply HEPA filter    E. negative pressure exhaust plenum    F. supply blower   
G. filter screen
NOTE:The carbon filter in the building exhaust system is not shown.
The cabinet exhaust needs to be connected to the building exhaust system
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