Model DDT low noise multi-vane centrifugal ventilator has been de-signed and manufactured by our factory in order to adapt to the requirements of the increasingly developed purification industry and environmental protection & noise 每decrease. The fan adopts the multi-purpose optimized design methods for various pneumatic parameters such as noise, efficiency etc. It fulfills the finest performance matching of the overall frame with sound air-opera-fed 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 canteen, hotel restaurant, snack counter and so forth. It is also fit for use in the production equipments of the grain; chemical; plastic machineries etc. It is of wide use and strong adaptability.