YDW outer rotor centrifugal fan is widely used in hotel, restaurant, factory and other building constructions as the associated facility of air-conditioner or for ventilation purpose(for instance, the associated facility of the central air-conditioning, fresh air handling unit, variable-air-volume air treatment unit, air cleaning facility, radiator, cooler, drying equipment, coating equipment, filling machine, various fuming hoods, fan case,  range hood and dust shaker ). The outer rotor centrifugal fan can keep low-noise when transport air flow with high efficiency. Its structure is made by high-quality steel plate through stamping, riveting and welding of advanced technology, therefore it has the characteristics of compact and firm structure, small volume, and convenient installation & maintenance. The design features of the outer rotor centrifugal fan is that it uses multi-blade forward centrifugal impeller, and direct connected to the small double-suction outer rotor electric machine, thus it has large air quantity, high efficiency, low noise and with superior performance.