CVS Adjustable Louver has blades that can be opened or closed either manually or mechanically with an electric actuator. This type of louver is used when the opening needs to be closed up to provide a more positive rain barrier. Operable extruded aluminum and fabricated steel CVS Adjustable Blade Louvers protect air intake and exhaust openings in exterior walls. When in the open position these louvers function as a conventional louver while providing tight shutoff from air and other elements when in the closed position. These products are most often provided with factory-mounted manual quadrants or electric actuators. CVS Adjustable Blade Louvers are available in Extruded Aluminum, and Galvanized Steel and in different RAL finishes as per the project requirements.