The Air Series AF case fans provide excellent performance in unobstructed areas with at least 3 cm of clearance. They are ideal for mounting on the rear or top of your PC case as exhaust fans for the motherboard, CPU, graphics card, and other components that heat up your case. They can also be used in areas such as side panels or air intakes at the bottom as unobstructed intake fans. For heavily restricted areas like hard drive cages or other tight spaces with less air volume, the Air Series SP models are recommended for high static pressure fans.