This Hazardous Location Unit Heater is ideal for rugged industrial applications where there is a possibility of explosion or fire caused by flammable gases, vapors, powdered metals or dust. Made using 14 gauge steel cabinet with epoxy powder coated finish and narrow gap safety fan guard. Adjustable louvers allow directional control of air flow. Fan forced heater features a permanently sealed, liquid to air, finned tube heat exchanger core. Ethylene Glycol to water mixture uses a heat transfer liquid in the heater core for freeze damage protection. Manual reset capillary type high limit provides high temperature regulation and is rated for 6,000 cycles of service. 24V transformer and contactor. Pressure relief valve with cintered metal mesh flame arrestor. Ideal for Class I, Group C & D, Division 1 & 2 and Class II, Groups E, F & G, Divisions 1 & 2. Temperature code T3B for 329°F (165°C). ABS type approved. ETL listed. Factory Installed Options must be purchased with same order as unit heater; factory options include Single Pole Thermostat, Control Transformer, Disconnect Switch and Pilot Light. 1 Year Limited Warranty.