1.15 years' warranty 2.environmental and energy saving 3, water proof and corrosion resistant 4.high efficient ventilation The roof ventilation fan applies the theory of convection between natural wind and air to accelerate and transform any parallel airflow into vertical...

Roof ventilator--1.favored by industrial enterprises2.operated without electric 3.technological design 4.strong power of exhaust Advantages of roof ventilator driven by windStructure of high-qualityThe strict ball-shape structure and the permanently lubricant upper and lower ball...