Return Air Grille, Overall Depth 1 1/4 in, Overall Height 23 3/4 in, Overall Width 23 3/4 in, Maximum Opening Height 22 in, Maximum Opening Width 22 in, Filter Depth 1/4 in, Filter Height Not Applicable, Filter Width Not Applicable, Grille Color White, Grille Material Steel, Material Steel, Damper Material Not Applicable, Bar Spacing 3/4 in, Face Design Louvered, Airflow Directions One-Way, Adjustable Blades No, Mounting Location Wall, Mounting Style Surface Mount, Blade Angle 45 Degrees