Model 11-62A low noise centrifugal ventilator has been designed and produced according to the requirements from the increasingly developing purification industry and environmental protection and noise decrease. The fan adopts the multi-purpose optimized design schemes in aspects of noise efficiency, various pneumatic parameters. It fulfills the finest overall frame performance matching it has sound pneumatic performance the paddle-wheel, pulley have been implemented with strict static, dynamic balancing correction. Therefore it has the features such as smooth running, low noise little vibration long life and so on. It is widely applicable for kitchen exhaust, range hood or ventilation, air-exchange in the pubic places such as the unit canteens, guesthouses, restaurants, eating establish-ments etc. It is fit for use in the production equipments such as grain; chemical; plastic machineries and so on.