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Mounting Procedure
(Flanged heaters with compact terminal box)
1. At heater location, cut out a section of duct, or on
new construction lay out duct work to accommo-
date dimensions of heater.
2. Form mounting flanges on cut edges of duct as
shown in Figure 15.
3. Position heater in duct and attach duct lip to heater
flanges with sheet metal screws.
NOTE: Where necessary, make provision to support
weight of heater. Any part of heater flange may be
drilled for attaching hanger straps or duct.
4. Attach control box to duct with sheet metal screws
through the mounting holes provided inside the
control box.
5. Where necessary, joint between duct and heater
flange may be sealed with silicone gasket or seal-
ant.
Mounting Procedure
(Insert heaters with compact terminal box)
NOTE: Insert or slip-in type duct heaters are designed
to be inserted into existing duct and require a rectan-
gular hole of proper size to be cut. The heater frame is
manufactured with a specified duct height (H in figure
16) and a standard depth (D in figure 16). If the frame
does not match the specified dimensions contact a
Chromalox representative.
1. Measure the height and width of the heater frame
and note (H and D per figure 16).
2. The next step is to cut out the rough opening. Cut a
rectangle in the duct with dimensions H x (D - 1.5").
Remove the sheet metal. (See figure 16A)
3. With the rough opening cut and the sheet metal re-
moved, cut the remaining 3/4 and fold over sides to
create support tabs. (See figure 16A).
4. Attach control box to duct with sheet metal screws
through the mounting holes provided inside the
control box and through the brackets on the top
and bottom of heater.
5. Where necessary, make provision to support weight
of heater and terminal box.
Double
Lip
3/4"
3/4"
Sheet Metal
Screws
Mounting
Holes
3/4"
Double
Lip
Sheet Metal
Screws
Mounting
Holes
Cut 3/4" and fold
over to create tab
Cut out and remove
shaded area H x (D-1.5")
9
Self-Adhesive Gasket
Supplied with Heater and
Installed by Customer
Duct
D
W
Sheet Metal
H
H
Screws
W
Figure 15
Self-Adhesive Gasket
Supplied with Heater and
Installed by Customer
Duct
D
W
H
H
W
Figure 16
Cut 3/4" and fold
D
over to create tab
H
Figure 16a
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