Return Air Grilles, Overall Depth 1 in, Overall Height 21 3/8 in, Overall Width 9 3/8 in, Maximum Opening Height 10 in, Maximum Opening Width 22 in, Grille Color White, Grille Material Aluminum, Material Aluminum, Bar Spacing 1/2 in, Face Design Egg Crate, Airflow Directions Three-Way, Mounting Location Ceiling or Wall, Mounting Style Lay-In, Blade Angle 45 Degrees , Finish Powder Coated, Product Type Grille, Airflow Capacity 993 cfm, Package Quantity 4