Gas Wall Furnace, Heater Type Fan Forced Counterflow, Gas Type Lp, Btuh Input 35,000, Btuh Output 24,500, Ignition Type Matchless Piezo, Air Flow 275 Cfm, Vent Type Concentric Direct Vent, Voltage 115, Vent 7-1/2 In., Wall Type Exterior, Gas Connection 3/8 In.