Brushed DC motors can be up to 30% more efficient than AC motors due to their inherent design that uses permanent magnets to generate a secondary magnetic field rather than copper windings. As mentioned previously, EC fans are powered by a brushless DC motor which reduces the heat generated and turns this energy into rotational force and greater fan performance. Electronic circuitry performs the function of mechanical commutation in EC Fans, which in turn offers higher performance and efficiency. To offer even higher efficiency, the OA200EC series is available with dual speed functionality.