Furnace; DFM Series; Model DFMD20111; LP Gas; 20000 BTU; Single Stage; Side Or Bottom Ducted; 12 Volt DC; Medium SIze; 16-1/2 Inch Width x 7-3/8 Inch Height x 20 Inch Depth; Access Doors And Thermostat Sold Separately; Existing Cut Out Should Be Measured To Ensure The New Deeper Dimensions Will Fit