Hart & Cooley by Duravent Return Air Grille, Series: 672, 20 in W x 24 in H, 19-1/2 in Duct Width, 23-29/32 in Duct Height, 21-3/4 in Overall Width, 5/16 in Overall Depth, 647 to 1293 cfm, 2.16 sq-ft, 40 deg Deflection, 1/2 in Blade Spacing, Steel, Bright White Enamel, Domestic,