Explosion-Proof Heater. Ruffneck Convector, CX1, 480V, 1Phase, 60Hz, 3.6 kW (12284 Btu/hr), Class I, Div. 1 & 2, Groups C & D, c/w Built-in Thermostat, Temp Code: T2A (280°C [536°F]), built in thermostat, 15A max current, Sloped-top cabinet, Corrosion resistant, Incoloy® 840 heating elements, Radial-embossed aluminum plate fins