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

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Appendix A<br />

Figure 4. Canopy (thimble) unit for ducting a Class II, Type A BSC. A. balancing<br />

damper, B. flexible connector to exhaust system, C. cabinet exhaust HEPA filter housing,<br />

D. canopy unit, E. BSC. Note: There is a 1” gap between the canopy unit (D) and the<br />

exhaust filter housing (C), through which room air is exhausted.<br />

Figure 5A. The Class II, Type B1 BSC (classic design). A. front opening, B. sash, C.<br />

exhaust HEPA filter, D. supply HEPA filter, E. negative pressure dedicated exhaust<br />

plenum, F. blower, G. additional HEPA filter for supply air. Note: The cabinet exhaust<br />

needs to be hard connected to the building exhaust system.<br />

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