1, shutter rod, winter boot by manual shutter lever open Venetian blinds, ventilation, and lighting effects; 

2, twisted metal forming blades, aluminum 2.0mm, reasonable leaf angle, atmospheric flow impact ensure at the same time, have a very low noise; 

3, strict quality testing procedures: noise testing, vibration testing, rotating concentric test, blower speed testing, volume testing, machine efficiency measurement; 

4, the switch mechanism, with the help of two without power to right of hammer, configuring automatic devices to achieve, Venetian achieve the effect of wind-proof, dust-proof, rain-proof;