Combination louvers feature stationary front blades with hidden adjustable rear blades, providing adjustability while still giving fixed sight lines on the building’s exterior. All of our combination louvers are made with extruded aluminum and are drainable. They are available in a variety of frame depths , blade angles and spacing. Combination louvers feature stationary front blades with hidden adjustable rear blades, providing adjustability while still giving fixed sight lines on the building’s exterior.