Overview Product Description T9-DB12R, 12 in. Round In line Vent duct Booster. Designed to be installed at any angle of the duct of an under-ventilated room to increase either hot or cold air flow, 115v continuous operation. Control options (not included) Manual off / on Variable speed control. Automatic Control: Wire to furnace fan, Wire to fan switch, Wire to sail switch, Wire to a pressure switch, wire to a thermostat. length 8 in., 800 CFM, 120 watts, 1.5 amp.Cross Reference: T9-MCM12 Please note that this unit may come with a 120V plug which can be removed to accomplish various wiring accommodations. Some may require an electrical expert and should not be attempted. Product Videos Custom Field Product Reviews