This fan is compared with similar domestic and foreign fans, with a strong acid and alkali, high efficiency, low noise, smooth performance curve, efficient wide area characteristics. Generally used for blacksmiths furnace and high-pressure forced ventilation, and is widely used in material handling, suitable for conveying air and corrosive, not spontaneous, not containing viscous material gases. Transmission medium temperature ≤80oC, dust and hard fine particles contained in the medium ≤150mg / m3. The machine is divided into left and right two kinds of rotation, A, D two kinds of transmission mode.