INSTALLATION INSTRUCTIONS
MODEL MSCD CEILING DAMPER / TB5000
THERMAL INSULATION / AIR DIFFUSER
ASSEMBLIES
FIRE AND CEILING RADIATION DAMPERS
Metal-Fab, Inc. ceiling radiation dampers are classified for all UL Fire Resistant Floor-Ceiling and Roof-Ceiling Designs in the UL
Fire Resistance Directory that utilize a hinged type damper in the design. The classified UL assemblies are rated for three (3) hours
or less and construction materials include gypsum wallboard and acoustical panels (lay-in tiles). Refer to the UL Fire Resistance
Directory for specific design information.
When installed as described herein, the MSCD damper, TB5000 Thermal Insulation Assembly provides the necessary protection to
lay- in style ceiling air diffusers in Fire Rated Floor/Roof-Ceiling assemblies with fire resistance ratings of 3 hours or less, as described
in the current UL Fire Resistance Directory. A maximum size ceiling penetration of 576 sq. in. Can be protected utilizing the TB5000
Thermal Insulation furnished with the ceiling damper, to protect the exposed portion of the ceiling air diffuser and the neck or inlet of
the diffuser. Installation and diffuser shown in
FIG. 1
illustrate a general arrangement. Installations must also include any specific
requirements described in the specific fire resistant design.
Metal-Fab, Inc. ceiling radiation dampers are unrestricted in the type of transition incorporated between the damper and supply air
or return air duct systems. It is acceptable to attach the duct, rigid metal sleeve (plenum or boot) or flexible, directly to the damper.
Refer to the UL Fire Resistance Directory for specific design information (See
FIG. 2
).
All ceiling assemblies in the Fire Resistance Directory require that lay-in ceiling panels, which are cut to fill smaller size openings in
the ceiling grid modules due to air duct penetrations, must bear a minimum of 3/8” on the flanges of the grid.
PRINCIPAL COMPONENTS
1. UL Classified Model MSCD Damper and Model TB5000 Thermal Insulation (marked accessory part of MSCD dampers/blanket
assembly, UL Classified for use with damper size as noted on blanket).
ATTACHMENT OF MSCD DAMPER TO DIFFUSER NECk
1. Place damper tightly over or inside the diffuser neck and attach it to diffuser neck using #10 (min.) x 1/2” long sheet metal
screws to 8 in. O.C. (max.) with a minimum of (4) screws, 1 per side at a minimum of 3/16” from bottom of damper frame.
IMPORTANT: SCREWS USED IN CONNECTION OF DAMPER MUST NOT INTERFERE WITH DAMPER BLADE OPERATION.
INSTALLATION OF TB5000 THERMAL INSULATION
1. Install TB5000 over back of diffuser making sure hole in thermal insulation fits over neck of diffuser and making sure it is square
to diffuser. Replace if damaged during installation or shipment.
2. Tuck TB5000 Thermal Insulation behind T-bars around diffuser perimeter. TB5000 must cover all exposed surfaces of ceiling
air diffuser.
PREPARATION OF CEILING MEMBRANE
In order to properly install the Model MSCD damper/TB5000 Thermal Insulation / lay-in diffuser, the following must be done:
1. After installing the 2’ cross tee in the ceiling grid (or if already installed), bend back the tabs of the 2’ T-bars against the web of
the T-bar intersected.
2. Using No. 12 S.W.G. (min.) galvanized steel hanger wire, independently support all four corners of the T-bar system at the corners
of the diffuser. The hanger wires should be vertical (not splayed) and adequately fastened to the structural floor of roof
members above.
UL CLASSIFIED
(SEE COMPLETE MARKING
ON PRODUCT)
