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Type B2 Prefilter Replacement
NOTE: The prefilter is not washable; it must be replaced when it becomes
dirty.
1. Shut off the cabinet blower.
2. Using an appropriate step or ladder, remove the two wing nuts that secure the
prefilter, located next to the electronics module, as shown in Figure 6-24.
3. Remove and discard the prefilter, and replace it with a new one. Retighten the two
wing nuts that secure the prefilter.
Figure 6-24
Prefilter wing nuts
Type B2 HEPA Filter Replacement
CAUTION: The cabinet must be properly decontaminated before servicing the
exhaust HEPA filter. Following replacement of either HEPA filter, the cabinet
must be recertified.
CAUTION: HEPA filters can be awkward to handle and heavy. Use appropriate
lifting techniques to remove and handle it. Use two people to remove the
larger filters if possible.
1. Unplug the cabinet.
2. Remove the front dress panel as shown in Figure 6-1.
To Remove the Exhaust HEPA Filter:
3. Loosen all of the Phillips screws on the exhaust filter cover.
4. Loosen the four sealed exhaust filter bolts on the top of the cabinet hull, as
shown in Figure 6-25. DO NOT remove the bolts; only loosen them until the
exhaust HEPA filter is free of the filter frame.
5. Pull the exhaust HEPA filter straight out of the cabinet.
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