Dampers Supported From Ductwork Above cont...
Recess Mounted Air Inlet Or Outlet Devices
Figure 4
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ceiling damper (i.e. if the radiation damper is 12 in.
diameter [305mm] (nominal), the ceiling membrane
opening is larger than 13 in. diameter [330mm]).
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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 4).
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All hanger wires
must be vertical
(not splayed)!
Steel Duct
16 ga. x 1 1/2 in.
(1.5mm x 38mm) Steel
Channels (with 9/16 in.
(14mm)minimum flanges)
Steel Duct
Drop
Thermal
Blanket
Ceiling
Radiation
Damper
Air (Inlet or Outlet) Device
Detail B
9 3/4 in.
(248mm)
Maximum
