Material: Aluminum anode treatment (a)

Size: Custom size According to customer requirements (WXH)

Characteristics：

Both the tube body and the blade are made of aluminum sheet material with light quality.

The blade rotates with the hand knob switch, can adjust any angle.

The blade and the frame surface rotate the axle to have the stainless steel continuous motion piece to windproof leaks.

The large air damper is divided into compartments and reinforced.