Room To Room Fan - White If you have a fireplace, wood stove or space heater warming one room, this whisper quiet, compact electric doorway fan will circulate that warm air into an adjoining room, and balance the temperatures for even comfort. This electric doorway fan mounts easily in the corner of your door frame (hardware included) You can also use this door frame fan to help extend the effectiveness of an air purifier, or to move cool air from room to room. The Room-to-Room Fan measures 7"x7", and is just 3" thick By using this Room-to-Room Fan, your furnace won't have to work so hard, so you'll save money.