Infrared Gas Tube Heater Indoor Outdoor Gas Type NG 150 000 BtuH Length 607 In. Width 18-1/8 In. Height 8-1/2 In. Radiant Pipe 50 ft. Heater Voltage 120VAC 60 Hz 4.8 Amps AC Min Mounting Height 15 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