Ashley Warm Air Wood/Coal Furnace, Heating Performance 25,100 To 107,000 BTU’s Per Hour, Enough To Heat Most Medium & Large Homes Up To 2,000 SQFT, Adjustable Draft Fan Optimizes The Variable Condition Of The Sold Fuel, Wet/Dry Wood Or Hard/Soft Wood, Extra Heavy Duty Cast Iron Feed & Ash Door With Ceramic Door Gaskets Prevent Warp Age, Furnace Control Center Automatically Monitors The Draft Fan & The 2 Speed Distribution Fan, Sliding Baffle Plate Bypasses Secondary Heat Chamber To Increase Stack Temperature & Decrease Creosote Formation At Start...