Ec Fan, DC Brushless Fan, External Rotor Motor Fan manufacturer / supplier in China, offering 355*171.5mm DC 48V Backward Curved Centrifugal Fan for Ventilation Equipments Project, 355*171.5mm 48V 163W IP44 Waterproof DC Backward Curved Centrifugal Fan, 310*202mm 230V 350W Ec Backward Centrifugal Fan for Air Conditioning and so on.