Round Fire and Combination Fire Smoke Dampers
4
Damper Model
Maximum Size
DFDR-510
24 in.
(610mm)
FDR-510
FSDR-511
FSDR-512
Maximum Size Table
Fire damper assemblies expand during periods of intense heat. Therefore, it is essential that openings in walls or
floors be larger than the fire or combination fire smoke damper assembly to allow for this expansion. The wall/floor
opening must be a minimum of
7
⁄
8
in. (22mm) larger than the outside diameter of the damper.
Clearances Required Between Damper Sleeves and Wall/Floor Openings
IN THIS GROOVE.
RETAINER PLATE
DO NOT PLACE
IN THIS GROOVE.
DO NOT PLACE
RETAINER PLATE
DAMPER FRAME
DAMPER FRAME
WOOD
STUD
MIN
1.00
STUD
METAL
1.00
MIN
Figure 3: wood stud
IN THIS GROOVE.
RETAINER PLATE
DO NOT PLACE
IN THIS GROOVE.
DO NOT PLACE
RETAINER PLATE
DAMPER FRAME
DAMPER FRAME
WOOD
STUD
MIN
1.00
STUD
METAL
1.00
MIN
Figure 4: metal stud
