Abstract: A wireless radial damper system includes at least one radial damper having a motor connected thereto to rotate the radial damper between an open position and a closed position inside a duct. A receiver is connected to the motor for communicating with the motor via a wireless signal. A wireless thermostat remote from the receiver sends the wireless signal to the receiver which in turn operates the motor to control the radial damper. The wireless thermostat allows for the radial damper to be temperature controlled rather than user controlled. A wireless remote controller, a wireless wand or some other type of wireless device may be used in place of a wireless thermostat.

Abstract: The present invention is an expandable duct hanger comprised of two pieces, one piece having a ridge which slides into a channel in the other piece, each piece also having a prong on one end to secure and hold the duct hanger into the floor joists.