The present disclosure provides an apparatus for a cooling fan in a computer system. The apparatus comprises a plurality of bars, a plurality of slats, a knob, and at least one pin. Each slat of the plurality of slats pivotably couples to at least one bar in the plurality of bars. The knob is located at an option on each of bar of a plurality of bars. Rotating movements of the knob adjust the apparatus between a plurality of positions. The at least one pin can be received at an opening in the cooling fan.