A, fan purposes Centrifugal induced draft fan, is suitable for coal-fired power stations in the following 230 tons/when the steam boilers and induced draft fan series. In no other special requirement, also used for mine ventilation and ventilation. The media for air transport ventilator, the highest temperature does not exceed 80 ° C, exhauster, medium for the highest temperature flue shall not exceed 250 ° C. In the draft must be no less than before, with percent of 85 dust removal equipment, in order to reduce the HanChenLiang smoke entering blower fan, and improve the service life. Second, the fan 1. With induced fan into single absorption type. 2 each fan can be made into a right-lateral or left-lateral two types. From the motor clockwise, impeller, and dextral fan for "right," said, The whirlwind counterclockwise for left, "left" said. 3 the exits in cabinet fan of outlet Angle. The "left" right "can be made of 0 °, 45 °, 90 °, 135 °, 180 °, 225 ° Angle of six. 4 the transmission way for D fan motor and fan, link adopts flexible coupling drive directly.