Friedrich AG extruded aluminum architectural grille for WallMaster series Optional Architectural grille for Wall Master Heavy gauge aluminum alloy Downward sloping louvers for a clean, finished look Brushed aluminum finish 27Wx 17H x1 1/8D Optional Architectural Grille for WallMaster Heavy gauge aluminum alloy Downward sloping louvers for a clean, finished look Brushed aluminum finish 27"Wx 17"H x1 1/8"D