Hart & Cooley® Return Air Grille, Series: RH45, 8 x 8 in Size, 7-1/2 in Duct Width, 7-1/2 in Duct Height, 9-3/4 in Overall Width, 1 in Overall Depth, Fixed Blade Grate, 100 to 240 cfm Flow Rate, 0.24 sq-ft Effective Area, 45 deg Deflection Angle, 3/4 in Blade Spacing, Aluminum, White Painted, Domestic