Hart & Cooley® Return Air Filter Grille, Series: 673, 16 in W x 16 in H, 15-15/16 in Duct Height, 18-5/8 in Overall Length, 18-5/8 in Overall Width, 166 sq-in, 40 deg Deflection, 1/2 in Blade Spacing, Steel, Bright White, Domestic