Every house has one: a room that's the coldest in winter and the hottest in summer. Now you can even out the temperature in your home with this register booster fan. Simply replace your register with this 3-speed duct booster fan and plug it in. The thermostatically controlled sensor automatically turns on the register vent fan per your setting, to boost the output of your central AC or furnace system. The AirFlow BreezeTM Ultra Register Booster Fan installs flush; just slide it into a floor register opening measuring 6" x 10" or 6" x 12" and plug into a standard outlet. This duct booster fan can also mount to a wall or ceiling register using standard screws. The AirFlow BreezeTM Ultra Register Booster Fan includes a remote control for convenient operation anywhere in the room, plus digital display and 6' power cord.