Feature:
Material:Aluminium alloy/Stainless steel/Galvanized sheet
The vane is fixed, which are both 45 degrees.
Natural anodized aluminum finish or powder coated
OBD or Filter(Nylon or aluminium alloy)is optional.
Easy installation and maintenance

Functions: for external wall as the intake , avoid the water and spray 

Use : in the air return system of basement or machine room.