Hart & Cooley® Floor Register, 2-Way, Series: 421, 4 x 14 in, 13-5/8 in Duct Width, 3-3/4 in Duct Height, 5-1/2 in Overall Length, 15-1/2 in Overall Width, Effective Area: 37 sq-in, 1/2 in Blade Spacing, Steel, Bright White Enamel, Domestic