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To Remove the Supply HEPA Filter:
1. With the exhaust filter removed, use a 1/2-inch socket or wrench to tighten the
three plenum lift bolts located as noted in Figure 6-22. This will lift the plenum off of
the supply HEPA filter. Remove the Supply HEPA filter retainers on the front of the
plenum.
2. Slide the supply HEPA filter straight out the unit.
3. With the HEPA filters removed, inspect the filter shelf and the exhaust filter tray for
damage.
Figure 6-22
Plenum Lift Bolts (3)
Note: The Blower has been
removed for clarity only.
Supply HEPA filter retainers (3)
To Install a Supply HEPA Filter:
1. Install a new supply HEPA filter by pushing it straight into the cabinet, ensuring that
it is correctly oriented, and that the filter is centered on the filter shelf.
2. Use a 1/2-inch socket or wrench to sequentially loosen the three plenum lift bolts
located as noted in Figure 6-17. When properly positioned, the plenum box will be
aligned with the supply HEPA filter frame. Continue to loosen the bolts until the
plenum contacts the HEPA filter and has slightly compressed the filter gasket.
NOTE: The lift bolts should only be tightened enough to ensure a proper seal
of the supply HEPA filter. At maximum tightness, the supply filter's gasket
should be compressed to less than 50% of its original thickness. NEVER
tighten the locking bolts beyond this setting.
To Install an Exhaust HEPA Filter:
1. On 3-foot wide models, reinstall the exhaust filter pan, ensuring the filter stop flange
is oriented toward the rear of the cabinet.
2. On 3-foot wide models, thread all four sealed bolts into the exhaust filter pan.
3. Slide the new exhaust HEPA filter all the way into the pan.
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