Appearance of Type 680-B Blades:36 Total height:980mm Turbine diameter:880mm Ventilation caliber:680mm(upper round) 680/850*850mm(down square) Bottom palte aperture:680mm Capability and Advantages Exhaust the indoor harmful air refill with fresh air. Consequently improve the working environment, promote the workers¡¯ passion, enhance the company¡¯s overall working efficiency. Lower the cost, as this kind of product is one-time investment, without electricity and any other consumption. To enhance the security of workshop. Firstly,there¡¯s no need to worry about the explosion and electrical accident. Secondly, in case of fire, the roof ventilation equipment can accelerate the exhausting of indoor smoke. Reflect the strength of enterprises and human management. Strength the ¡°People-Oriented¡± concept of modern enterprises. Beautify the environment