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Inner Baffle
Remove Bracket and
Use Sheetmetal Screws
Thru Same Holes into Duct.
Figure 7
8. Installation with flexible duct. Where a duct heater
must be installed near a flexible duct connection,
be certain that a 4' minimum distance between the
duct heater and the flexible connector exists and
that the connector is suitable for 195°F tempera-
ture. (Refer to Fig. 8).
9. Do not install duct heater outdoors. Duct heaters
cannot be installed with rooftop equipment where
they are exposed to the weather.
Insert Type
Perforated Metal
Duct Heater
(50% Open Area)
Oversized Duct
Flexible Duct
(Must be suitable
for 195°F)
10. Installation with dampers or filters. Maintain at least
4' distance between duct heater and damper, filter
frames, or other similar obstructions. (Refer to Fig. 9).
Damper
Clearance: Zero clearance between duct heater and
combustible materials such as wood is permissible.
However, adequate clearance must be provided around
terminal box for proper ventilation and future service ac-
cessibility.
5
Duct Heater
4 Ft.
Min.
Figure 8
4 Ft.
Min.
Air Flow
Duct
Heater
Top of Duct
Figure 9
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