Product Name: SWF (A) high efficiency and low noise mixed flow fan widely tested in hotels, restaurants, shopping malls, office buildings, stadiums and other senior civil through ventilation, ventilation air and industrial and mining sites for more information pressurized pipeline: a Characteristics and application SWF series fans apply meridional acceleration method and "quasi-Three" flow theory of design, the use of linear-shaped outer cylinder, cone wheel, twist the wing blade, air inlet plus home collector or curved muffler structure form. Teach pressure gauge with high axial fans, air volume compared with the same machine number large centrifugal fan. High efficiency, compact structure, low noise, small size, easy installation, and other advantages. Wherein the two-speed fan can be adjusted by shifting the desired amount of wind, air pressure according to the trial working conditions.