Hart & Cooley by Duravent Sidewall Supply Register, Series: 821, 12 x 8 in, 11-1/4 in Duct Width, 7-1/4 in Duct Height, 9-7/8 in Overall Length, 13-7/8 in Overall Width, Adjustable Vertical Blade, 3/4 in Blade Spacing, Steel, Bright White Enamel, Domestic,