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2. Installation near air handler discharge. (Refer to Fig. 2).
Duct Heater
Air Handler
3. Installation in branch duct take-off. (Refer to Fig. 3).
Duct Heater
4. Installation near turns. (Refer to Fig. 4). If heater must
be installed closer than 4 feet from the downstream
side of a turn, turning vanes must be installed in the
turn. The turning vanes will straighten out the air
flow so it will be uniform over the face of the heater.
Duct Heater
Here or Here
4 Ft.
Min.
Figure 2
4 Ft. Min. Straight Section
Figure 3
2 Ft.
Min.
4 Ft.
Min.
Figure 4
5. Installation with duct transitions in some air distri-
bution systems, the duct heater may be consid-
erably larger than the ductwork and the duct area
must be increased by a sheet metal transition. The
slope of the transformation piece on the upstream
side of the equipment is limited to 30° as indicated
in Fig. 5. On the leaving side, the slope should not
be more than 45°.
Air
Flow
4 Ft. Min.
6. Do not insulate control or terminal box. (Refer to Fig. 6).
Top of Duct
7. Installation in duct larger than heater. For installa-
tion where the duct dimensions exceed the insert
type heater dimensions, the area beyond the heater
dimensions must be filled with wire mesh, expand-
ed or perforated sheet metal of 50% open area as
shown in Figure 7. This will maintain a uniform air
velocity across the face of the duct.
4
30"
Max.
45°
45°
30°
Max.
4 Ft. Min.
Figure 5
External
Insulation
Duct Heater
Leave Control
Box Uninsulated
Figure 6
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