wind turbine exhaust fans/air driven turbine roof

Unpowered roof fan 1.Without any energy, environment friendly, benefit from an investment for life. 2. Efficient ventilation, moisture capacity 3. Special blade design ensuresto operate sensitively. 4. Imported bearings, lownoise anddurable 5. The unique angle-diameter andeasy to install. 1. Natural wind drives, operatesall day. 2. High sensitivity, slight wind or the range of temperature can drive the tubine blader to move. 3. Rotary stablely, quietly to improve the inner environment of room. 4. Using complete senior axis bearing, no lubrication andsolid. 5. Corrosion resistance, acid and alkali proof andlong service life.