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External Supply Plenum Installation
The purpose of the external supply plenum is to provide make-up air to an exhaust hood to maintain
the air balance in the space. The external supply plenum must be hung independent of the hood.
Follow the instructions for hanging the following supply plenums: Horizontal, Air Curtain and Variable.
See page 8 for Back Supply Plenum. If an external supply plenum is not provided, skip this section.
Installation Instructions
1. If duct collar(s) is shipped loose,
place the duct collar(s) over the
opening, fastening with tack-
welds at 1 to in. (.54 to 5.08 cm)
intervals, or sheet metal screws
at 3 to 6 in. (7.6 to 15.4 cm)
intervals.
. Insert 1/ in. (1.7 mm) diameter
threaded rod (by others) into all
of the hanger brackets on the
supply plenum top. Raise external
supply plenum and hang level from
adequate roof or ceiling supports.
(Horizontal Supply Plenum shown
in Fig. 7, must be below finished
ceiling. Air Curtain Supply Plenum
may be fit into drop ceiling.)
3. Remove perforated panel from
plenum and bolt to enclosures
through back of plenum (Fig. 8).
This will draw plenum tight to the
enclosures. Fasteners are not
intended to support the plenum;
for alignment purposes only.
4. Caulk mating joints with
NSF Approved silicone caulk
(GE SCS1009, or its equivalent).
The caulk is not provided.
Support plenum from all
hangers provided
Fig. 7
Bolt back of
plenum to
enclosures
Fig. 8
7
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