Labconco 3980200 User Manual - page 47

42 

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. 

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.