The NF-A14 is a high quality 140mm square frame silent fan that meets Noctua's Advanced Acoustic Optimisation AAO standard. Thanks to its square shape and 140mm mounting holes (124.5mm spacing) it is ideal for use with liquid cooling radiators or as an upgrade for 140mm case fans. With sophisticated aerodynamic design features like Flow Acceleration Channels, the NF-A14 increases the award-winning NF-P14's renowned silent dissipation performance. The FLX version is able to adjust the speed of 1200/1050/900 rpm via the supplied noise reduction adapters to offer complete flexibility in its adjustment to optimize fan performance to the maximum at near absolute silent operation. Thanks to its superb smoothness in operation, the industry reference bearing SSO2 and renowned Noctua quality make it a top choice for the highest demands.