We are the professional manufacturer of turbine roof ventilator in China and have been exporter for many years. Turbine air Ventilator, ,rooftop ventilator, turbine rooftop ventilator, air ventilator, turbo ventilator, turbFive models of Our turbine roof ventilator: TG-880,TG-600,TG-500B and TG-300 ,TG-250,TG-200,TG-150. They are used for environmental protection and saving power as the first-class no- power ventilation in China.Main traits the products are possessed with:1 no power exhausting, saving energy and money;2 anti-acid–base, anti-erosion, long usage;3 no noise, no pollution, absolutely environmental protection;4 improving the air quality, raising working efficiency;5 conveniently setting up and so on.usage domain of the productsThey are widely used in chemical industry, light industry, food, medicine, textile and dye, metallurgy, electrical power, construction, tunnel, machine and hotel, cinema and marketplace.The Operating Theory of TG no-power Ventilator:1.The undulating vane leads to smooth rotation at light wind. The bearings at lower and upper position make smooth