9-19 type fan can be widely used for material conveying, air and no corrosion, no combustion does not contain the viscous material gas. The conveying medium temperature is generally not more than80℃, containing dust and hard particles is not more than 150mg/m3. Applicable to general forging, glass, ceramic, radio, electroplating, batteries and other industries in the high pressure forced ventilation and food, feed, powder, plastic and other processing industries material handling.