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Field Installation of Steel Plenums cont........
Damper
Frame
Damper and Steel Plenum
CRD-1WT Grille Mount
Fabrication of Fiberglass Ductboard Plenum for CRD-1WT
1. Fiberglass ductboard shall be a minmum of 1 inch
(25mm) thick UL181 Listed and have a minmum
R-value 4.3 .
2. The inside width x length dimensions on the duct
board plenum shall be sized no greater than
1/8 in. (3mm) larger than the damper frame. The
maximum plenum height shall be 15 in. (381mm)
as illustrated below. The plenum should be sized
to provide a snug fit over the damper frame.
3. Edge and corner preparation shall be accordance
with details shown (Figures 9 and 10). Plenum
top shall be fabricated and attached using similar
method, S-AF and SF-AF (Figures 9 and 10).
4. Corner sealing tape shall be UL 181 Listed and
minimum of 2 in. ( 51mm) wide.
AF - Square Cut
with Flap
S - Female Shiplap
14 in.
maximum
Plaster
Flange
Assembly
AF - Square Cut
SF - Female Shiplap with
End Flap
Damper
Frame
Damper and Steel Plenum
Assembly
CRD-1WT Duct Mount
5. The plenum duct collars shall be minimum of 30
ga. (.39mm) galvanized steel. The total area of the
plenum box duct collars shall not exceed 78.5 sq.
in. (1994 sq. mm) with a maximum of two duct
collars per plenum. Duct collars shall be securely
fastened to the plenum duct board. Any segment
of the duct collar that protrudes inside the plenum
must not interfere with the damper blade operation.
6. Plenum shall be attached to ceiling damper sub-
frame using UL 181 Listed tape (Figure 11).
7. Refer to Figure 4- 7 for ceiling damper installation.
The CRD-1WT ceiling radiation damper is classified
for use in specific wood truss ceiling assemblies.
See UL Fire Resistance Directory for floor/ceiling
design number M508 and roof/ceiling design
number P554.
VC - V-groove
Corner Fold
14 in.
maximum
Plaster
Flange
Figure 8
SC - Shiplap
Corner Fold
Figure 9
®
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