Installs into flue of your gas heater. Magic Heat Reclaimer consists of 10 heat-exchanger tubes and a thermostatically controlled fan to blow warmed air into the room. Turns on at 150deg F and off at 110deg F. 115 Volts. Produces 225 CFM and 8000 to 30,000 BTU. Peak performance is maintained by the use of Flue Stove Pipe cleaner (our Item# 172801). 18 1/4in.H x 10 5/8in.W x 14 1/4in.D. Please measure flue before ordering. U.S.A.