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1. If fan is to be used in a fire resistive membrane ceiling, a
ceiling radiation damper must be used. Otherwise,
proceed to Install the Fan.
2. If the ceiling radiation damper is already mounted to the
fan from the factory, proceed to Install the Fan.
3. To mount the ceiling radiation damper to fan, make sure
grille attachment tabs are facing down. Then place the
inlet part of the fan into the ceiling radiation damper collar,
and use self-tapping sheet metal screws (by others) to
screw through the damper collar and into the fan housing,
shown in Fig. 5.
2
Install the Fan
Installation Recommendations
1. For best performance, choose a location with the shortest possible
duct run and minimum number of elbows. Do not mount near cooking
equipment. Fig. 7 shows the minimum distance these fans should be
placed in relation to cooking equipment.
2. Attach adjustable mounting brackets to fan, but leave the screws
loose until proper height is determined, shown in Fig. 8. For fan
only opening, cut 23
3
⁄4 x 11
3
⁄4 inch hole in ceiling. For fan/CRD
combination opening only, cut 24
1
⁄8 x 12
1
⁄4 inch hole in ceiling.
For Frame Construction: Position unit between joists.
Position brackets such that bottom edge of housing will be
flush with finished ceiling, and tighten the adjustable mounting
brackets, shown in Fig. 9.
Do not install
fan in this area
45º
45º
Fig. 7
Top Mount
Bottom Mount
Brackets can be
used in either
position to adapt to
most mounting
situations
Bottom Mount
Fig. 8
Slots in the
brackets
allow fine
adjustment
for flush
fit with
wall/ceiling
opening
Fig. 9
Fig. 10
For Hanging Installations: Use Greenheck’s optional vibration isolator kit
Part Number VI Kit. Using the fan’s standard adjustable mounting brackets
and 10 by 32 threaded rod (by others), hang unit as shown in Fig. 10.
Ceiling Radiation Damper - CRD
Fig. 5
Do not allow
interference in
this area.