Reznor UDZ NG 300K BTU Input, 249K BTU Output, Sep Comb, Unit Heater, 83% AFUE with 6 inch" Vent, 3/4"Gas Connection, 120 Volts, MOCP-20A, Dims (WxDxH) 41"Wx40"Dx34.125"H, 278-lbs,