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credits bmbl December 7 '06.doc - Central Michigan University

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Appendix A<br />

Figure 6. The Class II, Type B2 BSC. A. front opening, B. sash, C. exhaust HEPA<br />

filter, D. supply HEPA filter, E. negative pressure exhaust plenum, F. filter screen. Note:<br />

The carbon filter in the exhaust system is not shown. The cabinet needs to be hard<br />

connected to the building exhaust system.<br />

Figure 7. The tabletop model of a Class II, Type A2 BSC. A. front opening, B. sash,<br />

C. exhaust HEPA filter, D. supply HEPA filter, E. positive pressure common plenum, F.<br />

negative pressure plenum. The Class II Type A2 BSC is not equivalent to what was<br />

formerly called a Class II Type B3 unless it is connected to the building exhaust<br />

system. Note: The A2 BSC should be canopy connected to the exhaust system.<br />

336

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