"Mr. Heater 45,000 BTU Low - intensity Infrared Tube Heater. Efficient, effective radiant heat. Click image to enlarge... Thaw out your shop, garage, warehouse, barn and more with the even heat distribution provided by infrared technology. Mr Heater, at your service: Compact 3"" aluminized steel U-tube design Polished aluminum deep-dish reflector Easy install: Just hang the unit, run gas and electric and vent Horizontal or angle mount Air intake and exhaust collars attached Commercial and residential approved Indoor / outdoor approved The specs: Electrical rating: 120VAC, 60Hz, single phase, 1 amp Electrical connection: 3-pin molded plug Gas inlet connection: 1/2"" male NPT Gas inlet pressure: 5"" w.c. (min), 10 1/2"" w.c. (max) Manifold pressure: 4"" w.c. 91 lbs. 10'l. Mounting clearances: Top: 5"" (horizontal); 5"" (45 angle) Bottom: 54"" (horizontal); 36"" (45 angle) Reflector side: 24"" (horizontal); 4"" (45 angle) Tube side: 24"" (horizontal); 38"" (45 angle) Reflector end: 6"" (horizontal); 6"" (45 angle) Burner end: ("