Shandong no power ventilation - no power ventilation factory direct sales hotline: 0534-6350444, also called non-powered ventilation roof ventilation, natural ventilation, free power ventilators, turbine ventilators, is mounted on the top sides of the roof of industrial plants ventilation equipment, add enough electricity 24 hours free outdoor fresh air, and promote plant convection air circulation, improve the working environment, protect the health of workers. Improve the quality of work and efficiency, and create benefits for the enterprise more productive! No power ventilation works: 1. Is the use of the principle of the natural convection of air, the air flow in any direction parallel to speed and into the vertical air flow from the bottom up. 2. The combination of the use of buildings and equipment chimney effect itself, in order to achieve a ventilation of indoor and outdoor facilities. No power ventilation is mainly applied to large factories, warehouses, stadiums, livestock farms, commercial establishments, high-rise buildings, residential and so on.