Frame and deflection blades are made of high quality extruded aluminum profiled construction with the advantages of corrosion resistance and rigidity. Air distribution can be changed vertically or horizontally by means of deflection blades without changing the air flow rate. These blades can be fully adjusted from face opening. Dampers are designed in a unique way that it can be used as an equalizing grid. Positive alignment of adjacent sections can be made by using alignment strips. Suitable for installation for ceiling and sills. Foam gasket sealed around the back of the frame to avoid air leakage.