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Figure 5a.

The Class II, Type B1 BSC (classic design).

Connection to building exhaust system required.

A. front opening
B. sash
C. exhaust HEPA filter
D. supply HEPA filter
E. negative pressure exhaust plenum
F. blower
G. additional HEPA filter for air supply

Note: The cabinet exhaust needs to be connected to the building exhaust.

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Last Modified: 1/2/97
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