Greenheck Ceiling Radiation Dampers (826252) - Manual (Page 5)

Dampers Supported From Ductwork Above
A Note About Support
When main ducts are supported by 16 ga. x 1½ in.
steel channels (with 9/16 in. minimum flanges) located
1 in. to 3 in. from and on both sides of a steel duct
drop and these channels are suspended by #12 SWG
wire from structure above, the steel duct drop provides
all required support for ceiling damper and air inlet or
Ceiling Radiation
Damper
Tee Bar Optional Perforated Metal Grille
(Supplied By Others)
Skirt Material
must overhang
the Tee bars
All hanger wires
must be vertical
(not splayed)!
Figure 4
For Model CRD-60X
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the ceiling opening and installs directly into the
exposed Tee bar grid system opening.
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and may lay on top of perforated metal (or similar)
grille core material.
Dampers Supported By A Ceiling Grid System (cont.)
outlet devices. Air device flange must overlap the ceiling
membrane by a minimum of one inch.
Follow guidelines in Paragraphs 3 & 4, Page 1 when
preparing opening in the ceiling membrane and making
connections.
Ceiling Radiation
Damper
Tee Bar
Optional Perforated Metal Grille
(Supplied By Others)
All hanger wires
must be vertical
(not splayed)!
Figure 3
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perimeter of the damper.
Models CRD-60X may be installed as shown in
Figure 4.
4