Qmark Contemporary bar-stock grille designed to provide optimized airflow Automatic fan delay eliminates cold drafts on start-up and discharges residual heat from the heater body during shut down Manual reset thermal overheat protector disconnects power in the event of accidental blockage All units have a permanently lubricated enclosed fan motor, which creates long life and low maintenance, and gently distributes warmth throughout the area Built-in power on/off switch for added safety during maintenance and built in tamper-resistant thermostat Tamper-proof plug for thermostat hole *