24 Volt Spring Return
Mid-Torque Multi-Blade Dampers
24 Volt Spring Return Mid-Torque
Designed for zoning warm air, air
conditioning systems and fresh air intake;
open operation only, power close.
The exterior side mounted linkage ensures quiet operation and a
smooth in-duct air flow.
The blades are mounted with friction minimizing
Extruded aluminium frame and blades make
for a very strong yet lightweight damper.
Gasketing included for high integrity seal.
24 volt mid-torque motor already installed
Available in 6" x 8" to 12" x 24"; both
side and bottom motor mount configurations available.
Custom sizes also available on request.
Damper and motor guaranteed for three years
To use the MMB-SR damper selection chart below:
For the MMB-SR dampers, consider the motor
on the width side.
Determine the dimensions, height and
width you need, and find the appropriate intersection in the
This intersection gives you the item
number for ordering Mid-Torque Multi-Blade Spring Return dampers.
When ordering Mid-Torque Multi-Blade Spring Return
dampers, give item number, description, height and
For example # 51163 is MMB-SR
10" x 20", (with motor on 20" side), and # 51126 is MMB-SR 20" x 10",
(with motor on the 10" side).
The PT-40 Transformer, item #35054,
powers up to 4 of these dampers and is recommended.