Feature:
Material:Aluminium alloy/Stainless steel/Galvanized sheet
The vane is 38 Degree.
Air Deflection 1 to 4 way, Square or Rectangular for choice.
Can add OBD or fliter as your requirement.
Easy installation and maintenance
Natural anodized aluminum finish or powder coated 

Functions:For external installation, to prevent ingress of rain water
Use : in the air return system of basement or machine room