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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 5, 6, 7, or 8. When channels are to be used as
support, they must be 16 ga. x 1½ in. (1.5mm x 38mm)
steel channels with 9/16 in. (14mm)
Ducted Surface Mounted Air Inlet Or Outlet Devices
3) may be up to one inch larger than the nominal
diameter [305mm] ceiling radiation damper could
have a maximum ceiling membrane opening of 13 in.
diameter [330mm]).
damper (See Page 2, Paragraph 4).
neck, and steel duct drop (See Page 2, Paragraph 4)
may be satisfied as follows:
1. 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 5).
Non-Ferrous Air Devices - Air devices that have
Detail C
Non - Ferrous
Device
Detail D
Non - Ferrous
Device
Figure 5
minimum flanges (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 2 when
preparing opening in the ceiling membrane and making
connections.
non-ferrous frames.
devices require one of the following:
1. A steel duct drop extension should extend
from the damper to the bottom surface of the
ceiling membrane and the opening in the ceiling
membrane (see Page 2, paragraph 3) should be
equal to the outside of the duct drop (See Detail
shown in Figure 5.
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 5).
All hanger wires
must be vertical
(not splayed)!
Steel Duct
Ceiling
Radiation
Damper
Detail B
Ferrous
Device
16 ga. x 1 1/2 in.
(1.5mm x 38mm)
Steel Channels
(with 9/16 in.
(14mm)minimum
flanges)
Air
(Inlet or Outlet)
Device
.
6 3/4 in.
(171mm)
maximum
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