Wall Heater Heater Type Fan Forced Counterflow Gas Type NG BtuH Input 40000 BtuH Output 32000 Ignition Type Intermittent Spark Air Flow Counterflow Vent Type Top Voltage 24 Vent Oval 4 In. Wall Type Single Gas Connection 1/2 In. Width 14-5/16 In. Depth 10-1/4 In. Height 81-5/16 In. Wall Opening Width 14-3/8 In. Wall Opening Depth 9-1/4 In. Wall Opening Height 81-3/8 In. Amps AC 2.55 Number of Speeds 2 Built-In Features Fan Finish Powder Coat