Performance introductionThe Type 11-62A centrifugal ventilator with low-noise and multi-plane is designed and produced for the fast-developing purification industry and noise reducing for environmental protection. In order to achieve the performance-matching optimum and better aerodynamic performance of whole ventilator, the optimized multiple-target design method has been taken into account whe designing the ventilators with various aerodynamic balance strictly checked, the impeller are ch-aracterized with smooth operation, low noise, heavy flow, small vibr-ation and long operating life and so on. This greatly applicable prod-uct is widely used for wind-discharging, fume extracting and ventilat-ing in kitchens of company canteens, hotels, restaurants, and other public places, as the production facilities such as foodstuff machines,chemical machines and plastics machineries.