Greenheck DFD Series Installation, Operation And Maintenance Manual page 42

Ceiling Radiation Damper (CRD)
If fan is to be used in a fire resistive membrane
ceiling, a ceiling radiation damper must be used.
If the ceiling radiation damper is already mounted to
the fan from the factory, proceed to Install the Fan.
A50-510, 710, 780 Models
Discharge Installation A50-90 Models
1
Insert plastic duct tab into box slots.
Box
Box Slot
Plastic Duct
Adapter Tabs
4 Ceiling Exhaust and Inline Fans
Attachment Tabs
B Models
Sheet Metal Screw #10x3/8
Phillips Head (PN 415838)
Plastic Duct
Adapter (PN 473388)
3
Install screws provided to secure discharge.
Sheet Metal Screw #10x3/8
Phillips Head (PN 415838)
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. If the
fan/light combination is being used, make sure ceiling
A700, 900-1550 Models
2
Rotate plastic duct adapter (PN 473388)
until the screw tabs meet the box.
Box
Plastic Duct
Adapter (PN 473388)
Screw holes
radiation damper has
an electrical plug in it.
The electrical plug must
be inserted into the fan.
Make sure the electrical
wire will not interfere with
damper operation as
shown in figure below.
Wires to ceiling fan
Do not allow
interference
in this area
Wires from lighted grille
Sheet Metal Screw #10x3/8
Phillips Head (PN 415838)
Screw Tabs
®