* liuModel CF-11 A low noise multi-vane centrifugal fan has been designed and manufactured by our factory in order to adapt to the requirements of the increasing developed purification industry and environmental protec- tion& noise-decrease. The fan adopts the mufti-purpose optimized design methods for various pneumatic parameters such as noise, efficiency etc. It fulfills the finest performance mathing of the overall frame with sound air-operated performance.The paddle-wheel, pulley have been implemented with strict static and dynamic balancing correction, therefore it has the features such as smooth running.Low noise, large flow, little vibration, long life etc. It is widely applicable for the kitchen exhaust of range hood， ventilation air-exchange in the public places such as unit canteed, hotel restaurant snack counter and so forth, It is also fit for use in the production equipments of the the grain; chemical; plastic machineries etc, It Is of wide use and strong adaptabilty.