Hart Cooley 673 24x24 W Air Return Grille, 24" W x 24" H, 673 Steel Return Filter Grille for Sidewall/Ceiling White (043526) All-steel construction 1/2 inch spaced fins set at 40 degrees Effectively conceals filter Use standard 1 inch thick disposable filters (NOT INCLUDED) Removable face for easy installation and cleaning Equipped with adjustable filter retainers Bright White finish