Greenheck Ceiling Radiation Dampers (826252) - Manual (Page 7)

Dampers Supported Directly From Structure
A Note About Support
Ceiling radiation dampers and air inlet or outlet devices
may also be supported directly from the structure
above using one or more of the methods described in
Figures 7, 8, 9, or 10. When channels are to be used
as support, they must be 16 ga. x 1½ in. steel channels
with 9/16 in. minimum flanges
Ducted Surface Mounted Air Inlet Or Outlet Devices
(2 required per damper on opposite sides). 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.
Dampers Supported From Ductwork Above (cont.)
Detail A
Detail B
Thermal
Blanket
Air (Inlet or Outlet) Device
Steel Duct
Drop
Steel Duct
All hanger wires
must be vertical
(not splayed)!
3 ¾ in. maximum
Ceiing
Radiation
Damper
16 ga. x 1½ in. steel
channels (with 9/16 in.
minimum flanges)
Figure 6
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size of available listed ceiling radiation dampers.
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3) may be up to one inch larger than the nominal
size of the ceiling radiation damper (i.e. a 12 in. x 12
in. (nominal) ceiling radiation damper could have a
maximum ceiling membrane opening of 13 in. x 13
in.).
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damper (See Page 1, Paragraph 4).
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neck, and steel duct drop (See Page 1, Paragraph 4)
may be satisfied in two ways:
1. Ceiling radiation damper and air device neck
may be connected directly to the duct drop
(See Detail A, Figure 7).
2. Ceiling radiation damper may be connected
directly to the air device neck and then the duct
drop connected to the damper (See Detail B,
Figure 7).
Non-Ferrous Air Devices - Air devices that have non-
ferrous frames.
Ceiling membrane openings that utilize non-ferrous
devices require one of the following:
1. The steel duct drop should extend to the bottom
surface of the ceiling membrane and the opening
in the ceiling membrane (see page 1, paragraph
3) should be equal to the outside of the duct
drop (See Detail C, Figure 7). Models CRD-1,
CRD-1LP, CRD-2, and CRD-60 may be installed
as shown in Figure 7 (Model CRD-1 &CRD-1LP
Illustrated).
2. A steel angle should be attached to the bottom
of the of the ceiling radiation damper and span
the gap from the ceiling radiation damper to the
bottom of the ceiling membrane. The steel angle
should overlap the ceiling membrane (See Detail
D, Figure 7).
Models CRD-1, CRD-1LP, CRD-2, and CRD-60 may be
installed as shown in Figure 7 (Model CRD-1 &
CRD-1LP Illustrated)
.
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