This Fire Chief FC300F add-on furnace combines exceptional quality at an affordable price.. MADE IN THE USA. Works with existing furnaces and HVAC duct work to heat up to 1200 square feet. Easily connects to existing duct work. Pre-Wired Electrical System - Fully automatic components are pre-wired for your convenience and will reduce electrical installation time and expense.. Thermostatically controlled blower with optional filter box delivers warm air while reducing the cost of heating your home.. High Grade, heavy (7 & 10) gauge steel is continuously welded for maximum structural strength.. Removable Ash Pan for safe cleaning and convenience. Heavy-duty Cast Iron Grate allows fine ash to drop into ash pan and leave the hot coals in the firebox. Model FC300 Furnace Specifications. Weight: 260 lb. approx. Height: 40.5". Width: 20". Depth: 24". Maximum Heating Capacity: 1200 sq ft. Maximum Btu"s: 80,000*. Maximum Log Size: 22". Flue Size: 6". Fire Chamber Volume: 4.00 cu ft. Plenum Size: 8" round. Door Size: 13" X 14". Height to Center of Flue collar: 35.25. Blower Capacity: 500 cfm. Blower Power Supply (Volts, Amps): 110, 20. Warranty Firebox: 5 year limited. Warranty Grates, Castings: 5 year limited. Optional Accessories for the FC300 Fire Chief Furnace:. FCFB300 Filter Box for FC300F (requires 16 x 20 x 1 filter). AM-BD8 - 8" Back Draft Damper. TB-24S - Hot Water Coil with Hole Saw. *The BTU ranges and heating capacity specifications are provided as guidelines only and in no way guarantee the output or capacity of the unit. The actual BTU output depends on the type of fuel being burned and its condition, the draft adjustment and the chimney that the unit is hooked up to. The actual area that the unit will heat depends on factors such as the condition of the building, heat loss, type of construction, amount of insulation, type of air movement and location of the unit."