Ruffneck Electric Heater FX5 Series 20in Fan, 480V, 3 Phase, 60Hz, Thermostat, optional built-in DS5 disconnect switch, 17.1°C (30.7°F) temperature rise, Temperature Code T3B 328°F (165°C), 119,450 BTU/hr, Welded Core, Minimum motor power 1/2HP, 21.3 m (70ft) Horizontal Air Throw, Explosion Proof, Aluminum Fan blades, 1725 RPM, operational in temeratures -4ºF to 104ºF (-20ºC to 40ºC), Storage Limitations ~ -58°F to 176°F (-50°C to 80°C), short term to 248°F (120°C). Do not immerse in water. Do not expose to rain or sn