Roof Supply Fan
4
®
Installation
Move the fan to its intended location and fasten it
securely through mounting holes provided in the
fan base. Shims may be necessary depending
upon thickness of the roofing material. For ducted
applications, an optional duct adapter (if provided)
is attached and holds the ductwork in place prior to
installing the unit. The diagram below shows a typical
installation with prefab roof curb and ductwork.
Access to the motor compartment is made by releasing
four latches which secure the cover. The cover should
be placed in an area where wind will not blow it off the
roof.
Typical Installation
Fan Size
Curb Size*
Recommended
Roof Opening
Duct Size ID
Nominal
Damper Size
90
24
1
⁄
2
(662)
15
(381)
12
(305)
12 x 12
(305x305)
100
28
1
⁄
2
(724)
17
(432)
14
(356)
14 x 14
(356x356)
120
32
1
⁄
2
(826)
21
(533)
18
(457)
18 x 18
(457x457)
150
38
1
⁄
2
(978)
23
(584)
20
(508)
20 x 20
(508x508)
180
44
1
⁄
2
(1130)
29
(737)
26
(660)
26 x 26
(737x737)
200
50
1
⁄
2
(1283)
33
(838)
30
(762)
30 x 30
(838x838)
All dimensions are in inches
(millimeters)
.
* Recommended curb size shown is outside curb dimension without roofing
and flashing.
Note:
In cases where extreme snow depths may be encountered, extended
base may be required to raise unit or condensation pans may be required in
ductwork.
Prepunched mounting
holes and 2
1
⁄
2
in. skirt
to aid in installation.
Ductwork (by others)
Duct adapter (optional)
allows ductwork to
be completed prior to
setting unit on curb.
Roof curb
Electrical Connection
The electrical supply must be compatible with the fan
motor with regard to voltage, phase and amperage
capacity. Moreover, the electrical supply line must
be properly fused and conform to local and national
electrical codes.
Electrical lead-in wires should be routed through the
pre-punched hole in the optional duct adapter (if
provided) and the punched hole in the bottom of the fan
housing. Electrical wires must be located so as not to
rub on moving components. The electrical supply line
is connected to an optional safety disconnect switch (if
provided) or wired directly to the motor.
Wiring should be secured inside the fan to prevent
interference with the drive components. All wiring must
conform to local and national codes.
