Centrifugal fan №.2.8 ~ 6 outlet position for 0 ° -225 °, the interval for 45 °, transmission mode for the A-type transmission; №.7 ~ 12 outlet position is 0 °, 90 °, 180 °, №. 7-12 transmission mode for the C-type transmission. Centrifugal fan №.2.8 ~ 6 fans are assigned by the impeller, housing, air inlet and other units which consists of direct-coupled motor; №.7 ~ 12 addition to the above section, there are transmission parts and so on. 1) impeller by 10 sheet backward arc type blade, curved front plate and the plate after plate components. Both with steel manufacturing, and by the dynamic and static balance correction, air good performance, high efficiency, smooth operation. 2) air inlet is made whole, the fan is mounted on the surface. Parallel to the axial cross-section shape of the curve, the gas can smoothly enter the impeller, and minor damage. 3) Transmission Division 2 points from the spindle, bearing housing, bearing, pulley components. DEF cold double-suction centrifugal fan volute suction, steel cabinet structure, the whole painting is divided into two types of cold and galvanized sheet, choose from: The machine can be dismantled reload, convenient Users transportation, installation and use. The series has a large amount of wind, my voice low, stable structure, beautiful appearance, suitable for hotels, restaurants hall, basement and kitchen ventilation.