5 Plaque Infrared, 30,000 BTU, Natural Gas, Vent Free Wall Heater, Variable Heat Control, Piezo Ignition, Heats Approximate 1,000 SQFT, For Optional Blower Use #20-6127 & Optional Floor Stand Legs Use #20-5345, Not Included. NOTE: The state of California prohibits the use of this product. Please check your state and local codes prior to purchase. Due to the built-in oxygen safety sensor vent free products may not work properly at elevations of 4500 ft.