The NF-A15 is a quiet 140mm premium fan with round AAO (Advanced Acoustic Optimization) frame and 120mm mounting holes (105mm hole distance). For an even higher cooling performance on current high-end CPU coolers, the width has been extended to 150mm and through advanced aerodynamic design measures such as flow acceleration channels the NF-A15 achieves a further improved silent performance compared to the award-winning NF-P14. Noctuas specially designed PWM IC for fully automatic speed control as well as the SSO2 reference class bearing guarantee superb smoothness and excellent long-term stability. The modular cabling and the low-noise adapter make the NF-A15 a top solution for the highest demands.Round 140 mm frame with 150 mm widthThe NF-A15 was developed especially for use on current high-end CPU coolers: The width of 150 mm corresponds to that of most current high-end heatsinks and through the height of 140mm the fan does not protrude upwards, thus ensuring best housing compatibili