1.corrosion resistent 2. high efficiency in vetilating 3. energy saving and long life span 4. withstand severe rain and wind The roof ventilation fan applies the theory of convection between natural wind and air to accelerate and transform any parallel airflow into vertical so as to...

Roof ventilation fans 1.widely favored by industrial enterprises 2.operated without electric 3.strong power of exhaust  Roof Ventilation Fans Made by Aluminum Fluorocarbon Polyester Advantages of roof ventilation fansStructure of high-qualityThe strict ball-shape structure...