Round Fire and Combination Fire Smoke Dampers
6
Actuator and Temperature Response Device Connections
Actuator Connections
Electrical and/or pneumatic connections to damper actuators should be made in accordance with wiring and piping
diagrams developed in compliance with applicable codes, ordinances and regulations (see
Electrical Guidelines
).
Duct to Sleeve Connections
Sleeve Gauge and Connection Type Requirements
Round duct connections shall be attached with #8 or #10 sheet metal screws as follows:
• Ducts 22 in. (558mm) dia. and smaller shall have three screws.
• Ducts larger than 22 in. (558mm) dia. up to and including 24 in. (610mm) dia. shall have five screws.
Note:
All connections described may have duct sealant, PA2084T duct sealant adhesive manufactured by Precision,
DP1010 water base duct sealant manufactured by Design Polymerics, Grey Pookie, Ductmate PROseal®, or
CL Ward S Seal applied in accordance with SMACNA recommendations.
Damper assemblies must be installed in wall and 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. 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
Figure 7
).
• Position the retaining plate between the blade axle and the
actuator shaft as shown in
Figure 5 & 6
. Do not place
the retaining plate in the groove. IMPORTANT: The
clamping mechanism should face away from the wall/
floor.
• Place the damper and attached retaining plate into the
wall/floor opening.
• If a second retaining plate is being used, secure it on the
opposite side of the wall/floor.
• Verify position, blade orientation, and actuator clearance
then tighten the retaining plate clamping screws.
• The retaining plate(s) must overlap the wall/floor opening a
minimum of 1 in. (25mm).
• Secure the retaining plate(s) to the wall at the four corners
of each plate when two retaining plates are used
and also within 3/4 in. (19mm) of the center of each
side when one retaining plate is used. The following
fasteners shall be used:
- #8 or #10 screws of a length such that the screw
engages the steel stud/track by 1/2 in. (13mm)(steel
framing).
- #8 or #10 screws of a length such that screw engages
the wood stud by 13/4 in. (44mm) (wood framing)
- Steel anchors or self tapping concrete screws penetrating masonry or block by 11/4 in. (32mm).
Securing the Damper/Sleeve Assembly to Wall and Floor Openings
O 2 in. Min.
1.00 in. Min. Typ.
Fasteners
Clamping
Screw
Nut
Retaining
Plate Assembly
Clamping Screw
Minimum Wall/Floor Opening
= Nominal Dia. + 7/8 in.
Figure 7: Retaining Plates
