Qmark Contemporary commercial-grade steel grille designed to provide a clean appearance and rugged use Manual reset thermal overheat protector disconnects power in the event of accidental blockage Automatic fan delay eliminates cold drafts on start-up and discharges residual heat from the heater body during shut down Integral double-pole thermostat allows for easy adjustment of room temperature to maintain desired comfort level Positive OFF switch to assure heater will not operate if not needed All units have a permanently lubricated enclosed fan motor, which creates long life, low maintenance, and distributes warmth throughout the area Tamper-proof plug for thermostat hole *