United States Stove Company - The 1600EF Exterior Furnace is designed to use in conjunction with your existing HVAC ductwork and work seamlessly with your existing furnace while leaving the mess to the great outdoors. With up to 180,000 btu?s it is designed to heat a home up to 3000 sq. ft. This unit is made with a firebrick and cast iron lined firebox surrounded by powder coated all weather steel shell that is over lapped for a tighter weather seal. Connection to your existing ductwork is easy with the 10? heat outlet and 12? supply.Blower with 3 speeds, 1,200, 1,500, and 1,800 CFM 6 Flue collar Automatic bi-metal draft damper Firebrick lined to boost efficiency and heating capacity Separate ash door with removable dump pan Extra heavy duty cast-iron doors, grates, and liners Removable replaceable shaker grates (handle included) Durable painted exterior Not approved for use in mobile or modular homesBTU Range: 67,000 - 180,000 Coal Capacity: 160 lbs. Depth with blower: 65 Depth without blower: 47-1 2 Diameter heat outlet: 10 Firebox depth: 29-3 4 Firebox height: 24-1 2 Firebox width: 18-1 2 Fuel Type: Wood Coal Heating Capacity: 2,000 - 3,000 Sq. Ft. Height: 56 Log Length: 28 Weight: 715 lbs. Width: 29Due to EPA and state regulations, we are not allowed to ship this to California, Oregon and to Washington State..