... 30W. Mains features of External Rotor Brushless DC Motor controllor Using Brushless DC Motor energy-saving 30%~40% compare to ... % controllable speedEnvironmental friendly, low emission level, freatly improved efficiency, longger motor life and competitive priceTechnical features of External ... Centrifugal fan, DC and EC axial fan, DC and EC circular duct fan, EC Gas blower, etc. High efficiency EC fan ...