1. the Theory of Its Running Our Nopower Ventilations need not the electric power instead of easily driving the turbine vanes to ratate by nature breeze or the temperature difference between indoor and outdoor so as to make true the running without cost..They are the real practical and energy saving products without noise and pollution., so they can save much electric power and labour for users in order to lower the production cost clearly, to improve the working surrounding of the workshop, to rise the working efficiency even to strengthen the quality of the their products. 2. the Constitutes of the Material Our Nopower Ventilations are made of the whole stainless steel which need not maintenance any longer and are of anti-acid ?base and of anti-erosion by the only once investment. The Tongguan?Nopower Ventilations are set up the advanced bearings imported from America which can be assured for about 15 years. 3. the Values of the Nopwer Ventilations A. They can exhausted the hot air, waste gas, dust and other harmful gas meanwhile the fresh air outdoor can come into the workshop so as to better the working surrouding, to make the workers more energetic and to increase the benefits of the company. B. Lower the users?production costs. Because our Nopower Ventilations belongs to the products which need not electric power and other consumes for the life-long time after the only once investment, to a large extent they can lower the users?products costing. C. Enhance the concept of their safety in workshop. First of all, if there isnt so much harmful gas in workshop, the air can ventilate normally so that they neednt worry about the dangerous accidents caused by bombing or mistakingly using the electric power. Secondly, in case there happens the fire in workshop, our nopower ventilators on the roof can make the smoke indoor flow out more quickly, which at the same time can bring out more time for the victims to escape and reduce the loss by the accident. D. They can demonstrate the strength and the humanization management of the enterprise, enhance the people oriented ?principle of the modern enterprises and make a show of the times colorful image. E. Beautify our living and working surrounding. These nopower ventilators are possessed with an attractive appearance, so they can play their part in beautify the surrounding.