These installation instructions apply to 3 hour rated ceiling radiation dampers mounted in a ceiling with supports
from 1) a ceiling grid system, 2) ductwork above, or 3) structure above. Each type of damper support system is
described with damper being mounted in conjunction with various air devices.
1.
Application:
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ceiling radiation damper. When installed as shown,
they provide appropriate protection for air inlet
or outlet penetrations in the ceiling membrane of
floor/ceiling and roof/ceiling assemblies with fire
resistance ratings of up to 3 hours. Use of these
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use “hinged door” type dampers or other alternate
protection methods for specific floor/ceiling
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RESISTANCE DIRECTORY (FRD).
2.
System Components:
All system components
(ducts, duct drops, hanger wires, sleeves, and
diffuser pan) must be constructed of steel. The
diffuser core may be non-ferrous. Grilles may
be non-metallic. Flexible duct (if used) must be
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exceed 14 feet (4.27 m). The installations and
air devices shown in these instructions illustrate
general arrangement only. Installations must also
incorporate any specific requirements in the FRD.
Note that both “Design information - General” and
individual ceiling/floor or ceiling/roof design listings
apply.
3.
Ceiling Penetrations:
Ceiling penetration should
be located within ceiling tiles or panels without
necessitating cuts in the ceiling suspension main
runners or cross tees. If required, a maximum
of one runner or cross tee may be cut to enable
proper damper location and installation. Each cut
Ceiling Radiation Damper Application
end shall be supported by a minimum 12 SWG
vertical hanger wire. A
½
in. (13mm) clearance must
be maintained between the air inlet/outlet and the
cut end of the runner or cross tee.
4.
Connections:
Connections must be made using #8
sheet metal screws, 3/16 in. (4.7mm) tubular steel
rivets, tack or spot welds. Use a minimum of three
equally spaced connections. Space fasteners a
maximum of 6 in. (152mm) apart. All screws or rivet
attachments shall be placed a minimum of 3/16
in. (4.7mm) from the edge of the damper frame,
duct drop, diffuser, or grille frame. When making
connections, the ceiling radiation damper may slide
over the neck or inside the neck of the diffuser,
grille, or inlet/outlet device. Important: Connections
to damper frame must not interfere with damper
blade operation.
5.
Thermal Blanket:
In those installations where the
opening in the ceiling membrane is larger than
the ceiling damper (more than 1 in. (25mm) in any
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or QB) must be installed by laying over the exposed
surface of the air inlet or outlet device. The Thermal
Blanket rests upon and protects exposed portions
of the air device and may fit inside adjacent Tee
Bars (if any).
6.
Thermostat:
The CRD-501 is shipped from the
factory with the blades closed. The CRD-501 is
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Dampers Supported By A Ceiling Grid System
Exposed Tee Bar ceiling grid systems often use
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the following requirements, the ceiling grid system
provides all required support for installation of “
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style ceiling dampers and air inlets and/or outlets.
Ceiling openings up to a 24 in. x 24 in. (576 in.
2
)
(610mm x 610mm [.371 m
2
])
maximum are allowable.
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model must be observed.
The four corners of the grid module containing the
air device (or the midpoint of the adjacent cross-
tees) shall be directly supported from the structural
members of the floor or roof by 12 SWG minimum
vertical hanger wires. When the duct extends over
the intersections of the grid members, 16 ga. x 1
½
in.
(1.5mm x 38mm) steel channels with 9/16 in. (14mm)
minimum flanges shall be used to ensure that the
grid is supported from structural members by 12
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assemblies require lay-in ceiling panels be cut to fill the
remainder of hole openings larger than 24 in. x 24 in.
(610mm x 610mm) and shall provide a minimum of 3/8
in. (9.5mm) bearing on the ceiling grid members.
