Buy cost-effective stainless steel roof fan, recommend Shandong Lingyuan durable, trustworthy First, the performance: 1, zero failures: Strict ball-shaped structure, the upper and lower permanently lubricated ball bearings ensure a long service life, no maintenance, do not need replacement parts, high-precision closed US UBC bearing system provides absolute quality assurance. 2, strong. Design can be bent and rolled integrally molded with the blade, it is the most robust turbine ventilation equipment. 3, anti-corrosion: Use stainless steel, acid resistant, resistant to strong seal, and more resistant to corrosion, the material used for ventilation equipment in the best materials. Second, the function: the design is absolutely rainproof, it has a turbine blade, while the blade is rotated by centrifugal force, the indoor air from blocking the entry of rain, and between the blade and the blade due to rapid rotation, fill each form sheet gap, even a small blade attached to the raindrops, the roof can flow along the blades. Therefore, the turbine meter waterproof ventilation is best. 5, the operation means: The United States closed UBC high-precision bearing systems, highly heat-resistant synthetic oils as the best lubricant inside the bearing, permanently self-lubricated, without maintenance, even if the wind speed is less than 2 km in the breeze, it is also self-running. 6, to prevent noise: the use of wind-driven principle, not the use of motor power, cost-free operation of free power turbine ventilators stop the self-rotation, so silent no noise during operation. 7, dustproof. Rotating turbine ventilation is 24 hours non-stop, easy to attach dust, do not need cleaning. 8, light weight: light weight turbine ventilation, very light and strong, in the design of the planned plant construction, can not worry about heavy roof load. 9, light. There is a gap between the blade and the blade, the light will thus enter the room, increase the illumination. 10, automatic extraction plants, heat and moisture, dust, odors, smoke, odors and other chemical raw materials of the house, so that fresh air, comfortable. 11, effectively reduce interior, warehouses, workshops or factories inside temperature of 2-3 degrees, to avoid the summer heat stress and irritable mood, reduce the impact of high temperature on the storage of products or raw materials. 12, according to the natural climate ventilators automatic operation, no power consumption, save energy and money. Yili family homes, and the results are remarkable. 13, mounted on the roof ventilators, natural beauty shape, 24 hours a day non-stop rotation. Company Website http://www.wchnkt.com Hotline 15953431771 welcome your calls.