Our motorized HVAC dampers are offered with spring return, power open and power close models. When powered, the zone damper will do the opposite of its ambient position. Our motorized dampers have a 24 volt. The damper is built with a heavy galvanized round duct casing and aluminum blades which provides light weight with maximum strength. The motors are high torque and manufactured by Erie, a trusted motor brand. The damper design provides smooth operation and efficient energy efficient sealing.