- Purifier HEPA Filtered Enclosures & Purifier Class I Filtered Enclosures User's Manual

Chapter 6: Maintaining Your Filtered Enclosure

How to Install a New HEPA Filter

NOTE: The enclosure must be properly decontaminated before

servicing the HEPA filter. Only a qualified certifier

should service the HEPA filter. After the HEPA filter is

replaced, the enclosure MUST be certified. See Figure 6-

1. Unplug the enclosure.

2. Remove the front panel by loosening the two screws that

secure it, and then remove the filter access cover.

3. Using a 9/16" deep socket, loosen the filter clamp bolts

located on top. Refer to Figures 4-1 and 4-2.

4. With the clamp bolts loosened, the HEPA filter-clamping

frame should be clear of filter. Carefully pull the filter

straight out of the enclosure and discard properly.

5. With the filter removed, inspect the clamping frame and the

frame of the cabinet for damage.

6. Cover the surface of the new HEPA filter gasket with a

light coating of silicone grease, if desired.

7. Install the new HEPA filter by pushing it straight into the

cabinet, ensuring that it is correctly oriented with the gasket

facing up on the exhaust side of the enclosure. The filter

gasket is surrounded by a negative pressure plenum and the

gasket will not leak. Be sure the filter fits properly.

8. Tighten the clamp bolts uniformly until the filter gasket is

properly compressed against the frame. Inspect the seal

thoroughly before proceeding.

9. Reinstall the filter access cover and the front panel.

10. Plug the enclosure in and have it recertified before use.

CAUTION: The filter clamp bolts should only be tightened

enough to ensure a proper seal at maximum tightness. The

filter gasket should be compressed 50% or less.