Infrared Gas Tube Heater Indoor/Outdoor Gas Type LP 150 000 BtuH Length 492 In. Width 18-1/8 In. Height 8-1/2 In. Radiant Pipe 40 ft. Voltage 120 60 Hz 4.8 Amps AC Min Mounting Height 16 ft. Clearance to Combustibles (In.) Behind 1-45 Deg. 8 Clearance to Combustibles (In.) Below 0 Deg. 81 Clearance to Combustibles (In.) Front 1-45 Deg. 58 Clearance to Combustibles (In.) Sides 0 Deg. 24 Clearance to Combustibles (In.) Top 0 Deg. 6 Clearance to Combustibles (In.) Top 1-45 Deg. 10