Gas-Fired Duct Furnace Furnace Type Power Vented Heating Capacity Input 400 000 BtuH Heating Capacity Output 320 000 BtuH Air Temperature Rise 30 Degrees F Required Air Flow 3 704 cfm Service Access Location Bottom Overall Height 37 3/4 in Overall Width 48 1/8 in Overall Depth 37 in Gas Connection Size 3/4 in Gas Connection Type Male NPT Air Flow 9 877 cfm Air Flow @ 65(F) Rise 4 500 cfm Air Flow @ 80(F) Rise 3 600 cfm Burner Air Inlet Size 6 in Combustion Type Open Combustion