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8. Loosen the four filter exhaust filter bolts until the exhaust plenum is free of the
four bolts. See Figure 12-40.
It is recommended to have two persons perform Steps 8 and 9. When the exhaust filter
bolts are freed from the exhaust plenum, it will fall without support. Utilize a second
person to support the exhaust plenum while the bolts are removed one at a time. When
the bolts on one side are free, set that end of the exhaust plenum down gently, then
proceed to the two bolts on the opposite end.
Note: 2x4 boards may be utilized to help support the exhaust plenum, particularly on a
Type C1, when the exhaust filter bolts are removed. The boards allow for easier
removal of the exhaust plenum from the biosafety cabinet on a Type C1 because there
is a lip that the exhaust plenum must be lifted over, if boards are not utilized. See
Figure 12-41 for reference.
9. Lift and slide the exhaust plenum out of the cabinet.
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