Circulate air flow from room to room with an electric doorway fan. 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. 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. By using this Room-to-Room Fan, your furnace won't have to work so hard, so you'll save money. This electric doorway fan mounts easily in the corner of your door frame (hardware included). Simply place the narrow end of the included door frame fan template into the top edge of the door frame and the long edge against the door stop. Install the screws at each center point, allowing the screw to project 1/4". Then simply position the room to room fan securely onto the screws. That's it! The Room-to-Room Fan measures 7"x7", and is just 3" thick, so it won't interfere with door closings. The door frame fan can move 120 cu. ft. of air per minute and circulates air in an average room (10'x12') three times per hour. The Room-to-Room Fan has a convenient in-line on/off switch, a 10' cord and is ETL listed.