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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
3
Installation - Continued
2. SLEEVE LENGTH AND WALL/FLOOR
THICKNESS
Insert the damper assembly into the prepared opening,
to appropriate depth (see page 2, Fig. 1).
Recommended maximum and minimum insertion depth
can be exceeded as long as the
C
L
of the damper
blade remains within the plane of the wall/floor.
IMPORTANT SAFETY DANGER! To avoid causing
death or serious bodily harm to building occupants, do
not insert screws into the damper frame unless used
for duct connection within 2 in. (51mm) of the frame
end.
The sleeve may extend a maximum of 6 in. (152mm)
beyond both sides of the wall or floor. Recommended
standard sleeve lengths for various wall/floor
thicknesses are:
3. DUCT TO SLEEVE CONNECTIONS
Dampers are supplied with sleeves from the factory
and can be installed without the need for additional
field installed sleeves.
Gauge of factory furnished sleeve determines the
type of duct to sleeve connections required (see table
below). Any duct connection other than the breakaway
connections are considered rigid.
Opening + 2 in. Min.
Wall/Floor Opening
= Nominal Size + 7/8 in. Min.
1.00 in. T y p.
Fasteners
Clamping
Screw
Nut
Retaining
Plate Assembly
Clamping Screw
Fig. 2
5. Recommended Preparation of Openings in
Wood and Metal Stud Walls
• Frame wall openings as shown below. (see Fig. 3)
• Double vertical studs are not required for openings
36 in. x 36 in. (914mm x 914mm) or smaller.
• Gypsum wall board must be fastened 12 in. (305mm)
on center to all stud and runner flanges surrounding
opening. (see Fig. 4)
• All construction and fasteners must meet the
requirements of the appropriate wall design (See UL
Fire Resistance Directory) and/or local codes.
Fig. 3
4. SECURING THE DAMPER/SLEEVE ASSEMBLY
TO WALL AND FLOOR OPENINGS
Damper assemblies must be installed in wall/floor
openings using a single retaining plate on either side
of the wall/floor or by using a retaining plate on both
sides of the wall/floor. The use of a second retaining
plate is allowed, but is not necessary. A single retaining
plate is provided with the dampers. A second retaining
plate can be ordered as an option.
• The retaining plate(s) will open up for easy installation
when the clamping screw is loosened. If necessary,
remove the clamping screw and nut (see Fig. 2).
(IMPORTANT: The clamping mechanism should
face away from the wall/floor). Retainer plate(s) are
designed to mount flush to the wall/floor and hold the
damper in the wall/floor opening.
Opening + 2 in. Min.
Wall/Floor Opening
= Nominal Size + 7/8 in. Min.
1.00 in. T y p.
Fasteners
Clamping
Screw
Nut
Retaining
Plate Assembly
Clamping Screw
Wall/Floor Thickness
Dimension (T
w
)
Inches (mm)
Sleeve Length
Dimension (L)
Inches (mm)
Up to 6½ (165) 13 5/8 (346)
6½ - 8½ (165 - 216) 15 5/8 (397)
8½ - 10½ (216 - 267) 17 5/8 (448)
Sleeve Gauge
(mm)
Duct Dimension
Maximum
Inches (mm)
Type of Duct to
Sleeve Connection
Permitted
10 ga. (3.5)
24 (610) Rigid or Breakaway14 ga. (2)
16 ga. (1.5)
20 ga. (1mm) 24 (610) Breakaway only
Sleeve thickness must not be less than the gauge of the
connecting duct.
UL Standard 555 requires all ducts to terminate at fire damper
sleeves.
• Place the damper and attached retainer plate into the
wall/floor opening.
• If a second retaining plate is being used, secure it on
the opposite side of the wall/floor
DO NOT POSITION RETAINER PLATE(S) IN
FRAME GROOVE
• Verify position, blade orientation, and actuator
clearance then tighten the retainer plate clamping
screws. The retainer plate(s) must overlap the wall/
floor opening a minimum of 1 inch (25mm). Secure
the retainer plate(s) to the wall using appropriate
fasteners (minimum #8 sheet metal screws) at the
four corners of each retainer plate when two retainer
plates are used and also within ¾ in. (19mm) of the
center of each plate when one retainer plate is used.