Hart & Cooley 673 30x16 W Air Return Grille, 30" W x 16" H, 673 Steel Return Filter Grille for Sidewall/Ceiling - White (073164) 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