Gas Wall and Ceiling Unit Heater, Gas Type NG, Combustion Type Field Convertible, Fan Type Blower, BtuH Input 400,000, BtuH Output 332,000, 4,724 cfm Air Flow, 20.8 A Full Load Amps, Gas Connection 3/4 in, Flue Dia. 6 in, O.C. Mounting 48 5/8 in, Height 34 in, Width 55 1/4 in, Depth 56 1/8 in, Indoor Air Discharge Height 24 1/2 in, Indoor Air Discharge Width 48 3/4 in, Heater Voltage 115 V AC, 60 Hz, Air Temp. Rise 65 Degrees F, Installation Height 8 to 20 ft, Ignition System Direct Spark