The series of fans are molded by glass fiber and resin molding, and are combined with a direct connected cast aluminum shell motor (with coating coating). It has strong corrosion resistance, low noise, low power consumption, large air volume, easy to install and so on. Is the industrial workshop, warehouse, office, greenhouse flowers, poultry houses, plating, oxidation etc. sunstroke, selection of drainage ventilation of all kinds of waste gas. Conveying gas temperature are less than 60, the relative humidity is less than 99%. Dust and hard particles is less than 100mg/m3.