GMCAIR’s Adjustable Bar Type Supply Registers deliver high capacity airflow, with style, and solid construction. There are four different models to choose from, and all feature Technology, pristine white powder coat finish, and recessed screw holes. All two also offer options. These include: choice of vertical or horizontal blade positioning, and a choice to add our exclusive Multi-Shutter Damper, our Opposed Blade Damper, or no damper at all.