The NF-A14 is a silent 140mm premium fan with square AAO (Advanced Acoustic Optimisation) framework. Its square shape and 140mm mounting holes (124.5mm hole distance) make it an excellent choice for use on water-cooling radiators or as a case fan. Through advanced aerodynamic design measures such as Flow Acceleration Channels of NF-A14 achieved over the award-winning NF-P14 further improved quiet cooling performance.The PWM version is equipped with Noctua s specially designtem NE-FD1 IC for fully automatic speed control and is delivered with a Low-Noise adapter, which allows a reduction in the maximum speed from 1500 to 1200rpm. His performance-oriented maximum speed and the comprehensive options for speed control make the NF-A14 PWM to a point solution for users who want to achieve a perfect balance between excellent cooling performance and superb running smoothness - no matter whether on water-cooling radiators, heat sinks or ventilation of the case!