The centrifugal fan is to rely on the input of mechanical energy, improve gas pressure to send the gas side by side mechanical, it is a slave fluid machine. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and building ventilation, dust exhaust and cooling; boilers and industrial furnaces, ventilation and the wind; air-conditioning equipment and household appliances, cooling and ventilation; grain drying and sending; inflatable wind tunnel wind source and hovercraft propulsion. Centrifugal fan [1] According to the principle of converting kinetic energy as potential energy, the use of high-speed rotation of the impeller to the gas to accelerate and then decelerate to change the flow direction, converting the kinetic energy into potential energy (pressure). In single-stage centrifugal fan, the gas into the impeller from an axial, when changing the gas flowing through the impeller radially and then enter the diffuser. The gas change the direction of flow in the diffuser, to cause a slowdown, this deceleration of the kinetic energy is converted into pressure energy. The increased pressure occurs mainly in impeller, followed by the process occurs in the diffuser. In the multi-stage centrifugal fan, with refluxing allows airflow into the next impeller, generating a higher pressure. Centrifugal fan centrifugal fan structure composed by the chassis, spindle, impeller, bearings, drive mechanism and motor. Chassis: steel rugged, reliable, and easy maintenance for the sub-integral and semi-open, semi-open. Impeller: blades, curved front plate and plate after plate. Rotor: static balance and dynamic balance should be done to ensure smooth rotation, a good performance. Transmission parts: spindle bearing housing, ball bearing and pulley (or couplings). Foshan Sanhe Environmental Ventilation Equipment Co., Ltd. was founded in 2000, is a professional manufacturer of FRP corrosion resistant fan, plastic fan, FRP, PP mist purification tower the green ventilation equipment company; company formerly known as Guangzhou Sanhe Environmental ventilation equipment company to meet the needs of the business development, the company in 2009 from Guangzhou Panyu relocation to the Sanshui District, Foshan City, Datang Industrial Park, and renamed as Foshan Sanhe Environmental Ventilation Equipment Co., Ltd.. Foshan Sanhe Environmental Ventilation Equipment Co., Ltd. Tel :0757 -87,270,024 Mobile: 13318880325 Contact: Mr. Li Zaixiong Website: http://www.zgfengji.com/ Address: Foshan Sanshui District Datangpo Center Technology Park Hublot Road