114
Type C1
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. To remove the exhaust HEPA filter, remove all of the Phillips screws around the
perimeter of the exhaust cover. 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. Remove the exhaust
filter cover. See Figure 12-21.
4. Using a 1/2-inch socket, loosen the 4 bolts on top of the cabinet liner (Figure 12-
22), until filter drops 1/2 inch to 3/4 inch (19 mm). Do not remove these 4 bolts,
just loosen them to lower the exhaust filter.
5. Slide the exhaust HEPA filter straight out of the biosafety cabinet.
Note: When sliding the exhaust HEPA filter out, the rear edge of the filter frame
may catch and stop the filter from easily sliding out. If this happens, push the
filter back in about 1 inch (25 mm), pull the front edge of the filter down, which
will tilt the back edge up. Maintain this filter position, and slide the filter out.
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