All motors and contactor coils are 240V and operate on the secondary of a factory-installed step-down power transformer on 480V and 600V heaters so a separate fan and motor control power source is not needed. Automatic fan delay eliminates cold drafts on start-up and discharges residual heat from the heater body during shut down. Steel fins are copper-brazed to low-watt density, steel-sheathed tubular heating elements.