Plastic supply and extract ventilation grille with an adjustable row of front blades (version A) or front and back blades (version C) or with fixed blades at an angle of 45 ° (version S). The advantage of PVC-SHR-S grille is that it can be custom made in any size. For installation on round ducts, it's recommended to use PVC-SHR-RMO mounting frame.
