Main Features (1) Frame and blades made of galvanized sheet. (2) Efficient motor, energy efficient. (3) Belt drive, full copper motor. (4) Four-point fixing bracket, motor fixed more firmly. (5) machine with stainless steel screws, anti-corrosion, acid and alkali. (6) Using blinds, anti-rain, anti-mosquitoes. (7) Low noise and large airflow. (8) Long service life. (9) Can be widely used for the place need ventilation.