31
Donaldson Company, Inc.
afterfilter
clamp straps
and wing
screws
power pack
mounting base
sealant
plenum
HEPA and ASHRAE Afterfilter Installation
HEPA or ASHRAE Afterfilter Installation
The afterfilter plenum is mounted on top of the unit and
the blower is positioned inside the plenum.
1. Apply sealant around the clean-air outlet toward the
outside edge of the bolt hole pattern located on the
top of the collector.
2. Position the afterfilter plenum mounting base
aligning the bolt patterns.
3. Apply sealant to the plenum mounting base toward
the outside edge of the bolt pattern.
4. Install the blower housing, align bolt holes, and
fasten securely in place using hardware supplied
with the power pack.
5. Assemble the remaining power pack components as
described in Power Pack.
6. Apply sealant to the inside perimeter of the mounting
base. Install the plenum to the mounting base using
self-threading bolts with washers.
7. Install 1/2-in conduit using the holes on the back of
the afterfilter plenum. Flexible
or rigid conduit can be used.
8. Apply sealant to the plenum’s top flange and use self-
treading bolts and washers to secure the plenum top
to the plenum.
9. Install the afterfilters in the afterfilter frames. Install
HEPA filters with the gasket toward the inside of
the frame. Install ASHRAE filters with the airflow
direction arrow pointing outside.
10. Position the clamp straps and tighten the wing
screws securely.
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