Greenheck Ceiling Radiation Dampers (826252) - Manual (Page 2)

1. Application: Model CRD-1, CRD-1LP, CRD-2,
CRD-3, CRD-60 and CRD-60B are UL labeled
ceiling radiation dampers. 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
UL and Warnock Hersey labeled ceiling dampers
eliminates the need to use “hinged door” type
dampers or other alternate protection methods for
specific floor/ceiling and roof/ceiling designs shown
in the UL FIRE 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 Class
1 or Class 0 type, bearing the UL listing mark.
Maximum length of flex duct shall not exceed 14
feet. 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.
Ceiling Radiation Damper Application
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.
Document #453343
Installation Instructions for CRD Series
Ceiling Radiation Dampers
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555, 555S (Listing #R15439)
CSFM California State Fire Marshal
CRD-1/CRD-2 3226-0987:101
CRD-60 3226-0981:111
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 end shall
be supported by a minimum 12 SWG vertical hanger
wire. A
½ in. 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. tubular steel rivets, tack
or spot welds. Use a minimum of one connection
per side for rectangular or square dampers and
three equally spaced connections for round
dampers. Space fasteners a maximum of 6 in. apart.
Any W or H dimension larger than 12 in. requires a
minimum of two connections per side. All screws or
rivet attachments shall be placed a minimum of 3/16
in. 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.
Page
Damper Supported by a Ceiling Grid System 2
Lay-in Diffuser 2
Lay in Diffuser with Steel Drop 3
Unducted Ceiling Plenum 3-4
Dampers Supported from Ductwork Above 4
Surface Mounted Air Devices 4-5
Recess Mounted Air Devices 5-6
Page
Damper Supported Directly From Structure 6
Ducted Surface Mounted Air Devices 6-7
Ducted Recess Mounted Air Devices 7
Unducted Surface Mounted Air Devices 8
Unducted Recess Mounted Air Devices 9
Installation, Operation and Maintenance Instructions
®
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