The Air Series AF120 fans let you have it all. Nine ultra-thin, custom-molded blades push ample air volume. Rubber corners dramatically reduce vibration. The advanced hydraulic bearing system is quiet & reliable, & you can customize the look with the three included colored rings. AF models performs best in unrestricted spaces with at least 3cm of clearance, & theyre ideal for mounting at the rear or top of your PC case as exhaust fans for your PCs motherboard & CPU, graphics accelerators, & other components Filling the case with heat. They work equally well for unrestricted intake fans, for areas like side panels or bottom intakes.