Aerovent IM-175 - Manual

©1997 Aerovent
Fiberglass Reinforced Polyester Fans (FRP)
FG7 Tubeaxial, TF Tubeaxial & TF Vaneaxial Fans
FG7 Tubeaxial Fans
The installation of FRP tubeaxial fans requires some special considerations. The material is very strong and more flexible than steel.
Large FRP fans with heavy motors should not be expected to support themselves by the flange mounting alone. A fan mounted in
the vertical position should not be mounted to support a heavy stack without some reinforcement. It is usually satisfactory to mount
fans having motors up to 3 HP by the flanges alone. Match drill the flanges with the mating duct flange using eight equally spaced
holes, 7 ∕
16
" diameter, to accept a 3 ∕
8
" bolt. Since fiberglass is used only for corrosion resistance, it is recommended that stainless steel
bolts be used. Use a large washer under the head and nut to increase the load bearing area and do not tighten these to the point of
crushing the flanges. If the fan has a 5 HP or larger motor, it is good practice to attach a brace or hanger rod to the outer edge of
the motor base plate to take some of the weight. If the fan is to be mounted on the roof with a high discharge stack, brace the stack
just above the fan so that not all of the stack weight is carried on the fan mounting flanges.
Accessibility for service and cleaning is a very important consideration when installing an FRP tubeaxial fan. Since these fans are
not available with access doors, the fan should be mounted so it is easily removable for cleaning and service. You may also provide a
section of duct either side of the fan that is removable to provide access.
Fiberglass
Housing
Bearing
Cover
Shaft Seal
Base Support
Support Leg
Support Leg
Horizontal Mount Vertical Mount
Roof Ventilators
FRP roof ventilators are made in three pieces: the fan section, the curb base and damper section. These have been match drilled
and stainless steel bolts furnished for assembly. The base can be drilled for bolting to the curb and should be caulked or sealed in an
ordinary manner.
If a stack is to be added to raise the height of the discharge, it is recommended that this be placed between the fan and the wind
band damper section. If this is to be exceptionally long (over 10 feet of ordinary fiberglass construction), bracing should be provided
to take some of the weight of the stack section off of the ventilator fan and base assembly.
Damper Section
Fan
Curb Base
Field Procedure:
Caulk ventilator at
assembly where
indicated to prevent
leakage.
6"
Min.
Roof
Curb
Caulk
Seam
Roof
Line
Curb Base
SUGGESTED
MOUNTING
Motor Cover
General Installation, Operation and Maintenance Instructions For Aerovent Products
IM-175
June 1997