window shutter This shutter has advantages as simple structure, rain-proof, wind-proof, and easy to installation etc., with preferable ventilation performance and solid figure. The shutter has usage of rain-proof, ventilation, airflow adjustment, which can be widely used in work plant for electricity generate, metallurgy, chemical, and Gym, theater, other big-size constructions etc., and its usually used in the vent of the constructions outside wall for the elevator, piping system, and warehouse etc.. This Shutter has the same advantages & performance as rain-resistant shutter, besides, it also has dust-arrest, and dust-collection performance, that provide a reliable guarantee for the ventilation of wind & sand –heavy area.