TRUaire™ Adjustable Bar Type Supply Registers deliver high capacity airflow, with style, and solid construction. There are three different models to choose from, and all feature SmoothGlide™ Technology, pristine white powder coat finish, and recessed screw holes. All three also offer options. These include: choice of vertical or horizontal blade positioning, and a choice to add our exclusive SmoothGlide™ Multi-Shutter Damper, our SmoothGlide™ Opposed Blade Damper, or no damper at all. TRUaire™ Ceiling/Sidewall Register, 1-Way, Series: 210 Series, 20 x 8 in, 7-1/2 in Duct Height, 21-3/4 in Overall Width, 2-1/4 in Overall Depth, Adjustable Vertical Blade, 335 to 1780 cfm, 126 sq-in, 3/4 in Blade Spacing, Steel, Powder Coated, Import