Class II, A2 Biological Safety Cabinets__________________________________________________________________Service
10 -2
10. Release the two latches securing the supply plenum to
the blower housing.
11. Disconnect the vinyl tubing that connects the Mag gauge
to the plenum.
12. Remove the hex nuts (4 on the four-foot models, 6 on
the six-foot models), springs, washers and hold-down
brackets securing the plenum.
13. Remove the front filter hold-down studs (2 on the four-
foot models, 3 on the six-foot models) in front of the
plenum.
14. Slide the plenum from the cabinet.
15. Remove the supply filter and clean the filter mounting
surface.
16. Loosen - do not remove, the four bolts, springs and
washers that secure the exhaust filter.
17. Slide the exhaust filter out, clean the filter mounting sur-
face and install the new filter, ensuring that the gasket is
on the top.
18. Tighten the hex nuts to secure the new exhaust filter in
position.
19. Install the new supply filter with the gasket side down.
20. Reinstall the supply plenum and assemble the compo-
nents in reverse order.
The cabinet must be recertified after filter replacement.
Assembly Notes:
• Latches connecting the plenum to the blower housing have
a safety lock that must be released prior to opening the
latch.
• When tightening the filter hold-down nuts, the springs
should be compressed from 1/2 to 3/4 of their original
height.
• Ensure that the vinyl tubing from the Mag gauge is recon-
nected to the supply plenum.
• The Velcro connection on the exhaust boot must be smooth
with no gaps or loose spots to ensure proper sealing.
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