Feature:

1. Apply  with high-stren ghanodizd  aliuminum alloy .

2. there is sealing element between vane and vane, vane and exterior frame.

3. manual type can be adjusted in 6 levels  between 0~90 degree , but the automatic one can stay at  any  angle.

4. NO.FK-LM2 applies linkage rotation with cover board to prevent  dust and damage.