1.The front blades is as same as LD-B's
2.The back blade is fixed by wire and adjustable from 0-180 degree, control the airflow direction.
3.Anodized or powder coated white,colour RAL9010,RAL9016.
4.The edge of frame could be orthogonal, the model number is DG-H/O.
5.Size manufacture on customer require.