Hart & Cooley® Floor Register, 2-Way, Series: 421, 4 x 12 in, 11-5/8 in Duct Width, 3-3/4 in Duct Height, 5-1/2 in Overall Length, 13-1/2 in Overall Width, 1-1/2 in Closed, 2-1/4 in Open Overall Depth, 60 to 195 cfm, 32 sq-in, 1/2 in Blade Spacing, Steel, Golden Sand Enamel, Domestic