The Ruffneck™ FX5 Explosion-Proof Electric Air Unit Heater is designed for the harshest industrial environments and intended for dry indoor industrial applications such as oil refineries, petrochemical plants, pulp and paper mills, grain elevators, hazardous waste storage facilities, wastewater treatment plants. This heater is ideal anywhere that specific explosive gases or dusts may be present. Models range from 3-35kW and 208-600V. Heater core assembly is contained in a sturdy, epoxy-coated, 14-gauge steel cabinet (optional Heresite® coating and stainless steel construction for corrosive environments available), which also houses the motor and fan assembly. Adjustable louvres allow directional control of airflow. Narrow gap, two-piece fan guard provides safety against all moving parts. Automatic reset bimetal high-limit; secondary ambient high-limit for added safety. Optional slim junction box.