2015 Beijing DWT roof fan outlets - specifically for Hao Feng. Sales Hotline: 13573487358 DWT series roof fan with molded axial flow or centrifugal impeller, fan motor Direct drive, corrosion hood, metal or fiberglass duct base, corrosion resistant, light weight, high strength, smooth operation, easy maintenance, low noise, excellent performance characteristics, widely used in power generation, chemical, rubber, pharmaceutical, food processing, metallurgy and other industries and senior civil ventilation. DWT-I type with wide blades, large chord length, axial flow impeller space warp tilt, suitable for low pressure, high flow ventilation occasions. DWT-II-type centrifugal impeller optimized for higher pressure applications exhaust ventilation. Depending on the use of the environment and transport medium, the impeller can be aluminum, steel, plastic, glass, steel and other materials produced, made of conventional type, anti-corrosion, explosion-proof, corrosion-proof type.