This Corsair AF120 120mm Quiet Edition Case Fan Twin Pack gives you two great fans to increase airflow in your case. Using a hydraulic bearing, these 120mm case fans will stay quiet while running, keeping noise down and air flow up. AF120 Quiet Edition TWIN PACK. 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 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 they're ideal for mounting at the rear or top of your PC case as exhaust fans for your PC's 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.