The Air Series AF140 fans let you have it all. Eleven ultra-thin, custom-molded blades push ample air volume. Rubber corners dramatically reduce vibration. The advanced hydraulic bearing system is quiet and reliable, and you can customize the look with the three included colored rings. AF models performs best in unrestricted spaces with at least 3cm of clearance, and theyre ideal for mounting at the rear or top of your PC case as exhaust fans for your PCs motherboard and CPU, graphics accelerators, and other components Filling the case with heat. They work equally well for unrestricted intake fans, for areas like side panels or bottom intakes.