3
Model H-G/H-GB Centrifugal Roof Exhaust Fan
The unit should be stored at least 3½ in.
(89 mm)
off the
floor on wooden blocks covered with moisture proof
paper or polyethylene sheathing. Aisles between parts
and along all walls should be provided to permit air
circulation and space for inspection.
Outdoor
Fans designed for outdoor applications may be stored
outdoors, if absolutely necessary. Roads or aisles for
portable cranes and hauling equipment are needed.
The fan should be placed on a level surface to prevent
water from leaking into the fan. The fan should be
elevated on an adequate number of wooden blocks so
that it is above water and snow levels and has enough
blocking to prevent it from settling into soft ground.
Locate parts far enough apart to permit air circulation,
sunlight and space for periodic inspection. To minimize
water accumulation, place all fan parts on blocking
supports so that rain water will run off.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
Fan wheels should be blocked to prevent spinning
caused by strong winds.
Inspection and Maintenance During
Storage
While in storage, inspect fans once per month. Keep a
record of inspection and maintenance performed.
If moisture or dirt accumulations are found on parts,
the source should be located and eliminated. At each
inspection, rotate the wheel by hand ten to fifteen
revolutions to distribute lubricant on motor. If paint
deterioration begins, consideration should be given to
touch-up or repainting. Fans with special coatings may
require special techniques for touch-up or repair.
Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust
occur. Immediately remove the original rust preventive
coating with petroleum solvent and clean with lint-free
cloths. Polish any remaining rust from surface with
crocus cloth or fine emery paper and oil. Do not destroy
the continuity of the surfaces. Thoroughly wipe clean
with Tectyl 506 (Ashland Inc.) or the equivalent. For
hard to reach internal surfaces or for occasional use,
consider using Tectyl 511M Rust Preventive, WD40 or the
equivalent.
Removing From Storage
As fans are removed from storage to be installed in their
final location, they should be protected and maintained
in a similar fashion until the fan equipment goes into
operation.
WARNING
Installation, troubleshooting and parts replacement
is to be performed only by qualified personnel.
WARNING
Disconnect power before installing or servicing.
Installation
Typical Roof Mounting Installation
1. On the roof surface, cut an appropriate sized hole
and follow manufacturer’s instructions on curb
installation. Caulk and flash the curb to ensure a
water tight seal.
2. If unit is equipped with a backdraft damper, it should
be installed now.
3. Remove motor cover. Access to the motor
compartment is accomplished by removing the
screws as shown in figure 3.
4. Only on H-GB Belt Drive fans. On the drive frame use
the lifting lugs to lift and place the unit on top of roof
curb. (Refer to figure 2 on page 2).
H-GB Belt Drive
Fig. 5 - Typical Roof Mounting Installation
Factory Wired
from Motor to
Disconnect
Refer to Fig.
6 for Fastener
information
8 - 24 in.
(203-610mm)
H-GPF or SD Curb
1
1
⁄
4
in.
(32 mm)
Damper
Recommended
Duct and
Damper Size
Recommended
Roof Opening
1
⁄
2
in.
(13 mm)
Wiring by
Others
1
1
⁄
4
in.
(32 mm)
H-G Direct Drive
Fig. 4 - Typical Roof Mounting Installation
1
⁄
2
in.
(13 mm)
Wiring by
Others
Damper
Recommended
Duct and
Damper Size
Recommended
Roof Opening
1
1
⁄
4
in.
(32 mm)
1
1
⁄
4
in.
(32 mm)
Refer to Fig.
6 for Fastener
information
Factory Wired
from Motor to
Disconnect
8 - 24 in.
(203-610mm)
H-GPF or SD Curb
