Reclaims lost flue heat and circulates warm air into the room to increase fuel efficiency. Steel construction for long life. Whisper quiet, safety tested UL (Underwriters Laboratories) fan motor. Thermostatically controlled - turns on at 160 deg (degree), off at 130 deg. Black matte finish with decorative nickel trim. Mounts 15" to 24" above stove. For use with wood or coal stoves. Dimensions: 13-1/4" W x 10" H x 12" L Flue Size: 6" D UL Tested: Yes