Hart & Cooley® Floor Register, 2-Way, Series: 421, 6 x 10 in, 9-5/8 in Duct Width, 5-1/2 in Duct Height, 7-1/2 in Overall Length, 11-1/2 in Overall Width, 39 sq-in Effective Area, 1/2 in Blade Spacing, Steel, Golden Sand Enamel, Domestic