The characters and the advantages of “Tongguan” no power ventilation 
1. The theory of its running    Our no power ventilators needn’t the electric power    instead of easily driving the turbine vanes to ratite    by nature breeze or the temperature difference between    indoor and outdoor so as to make true the running    without cost.    They are really practical and energy-saving products    without noise and pollution so they can save much    electric power and labors for users, in order to lower    the production cost clearly, to improve the working    surrounding of the workshop, to rise the working    efficiency and even to strengthen the quality of their    products.
 2. The constitutes of the material    Our no power ventilations are made of the whole    stainless steel which needs no maintenance longer, are    anti-acid and anti-erosion by the only once investment.    The “Tongguan” no power ventilations are set up the    advanced bearings imported from America which can be    assured for about 15 years.
 3. The values of the no power 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 surrounding, to make the workers more       energetic and to increase the benefits of the       company.

B. Lower the users’ production costs. Because our no       power ventilations belongs to the products which       need no 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 is no much harmful gas in       workshop, the air can ventilate normally so that       they needn’t to worry about the dangerous accidents   caused by bombing or mistakenly using the electric       power.       Secondly, in case there happens the fire in workshop,       our No power 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 time’s colorful  image.
 E. Beautify our living and working surrounding. These   no power ventilators are possessed with an attractive appearance, so they can play their part in beautifying the surrounding.