We are offering roof turbine ventilator with following specifications: - the undulating vanes lead to smooth rotation at light wind. The bearings at lower and upper position make smooth turns. - the motility created by the rotation of the vanes brings the hot air, smoke and wet air up to the roof and exhausts them out. - because the turbine is went on rotating, the fresh air outdoor can enter into the room continually so that the room can ventilate conveniently. - the single rotating mechanism will work normally except there is the severe natural damage during 15 years. Our turbine ventilators are possessed with the following traits: no power exhausting, saving energy and money; anti-acid-base, anti- erosion, long-lived used; no noise, no pollution, absolutely environmental protection; improving the air quality, raising working efficiency; conveniently setting up and so on.