107
Type A2 (12-inch sash)
Follow these instructions carefully, and in the order documented.
HEPA filters can be awkward to handle, and quite heavy for larger models. Use safe
lifting techniques when removing and replacing the filters. Always use two persons to
remove and replace each HEPA filter.
1. Thoroughly and properly decontaminate the biosafety cabinet.
2. Remove the front dress panel as described earlier in this section under Removal
of External Dress Panels. Unplug the power cord to this biosafety cabinet.
3. Loosen all of the Phillips screws around the perimeter of the blower/plenum
cover. Remove all screws except two along the top edge of the cover. This will
support the cover. The sash stop bracket is held in place by two of the
blower/plenum cover screws. Remove this bracket.
4. Remove the last two screws. The blower/plenum cover will rest on the center
sash support (Figure 12-12) after the final screws are removed. Gently break the
gasket seal on the cover by starting in one corner. Use a flat screwdriver if
necessary, taking care not to damage the gasket or panel by prying too hard in
one area. Once the gasket seal is free, slide the cover to the left or right, and
bend it slightly to free one end by getting it past the corner post. Lift the
blower/plenum cover off.
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