The NF-A14 is a quiet 140mm premium fan with a square AAO (Advanced Acoustic Optimization) frame. Its square shape and 140mm mounting holes (124.5mm hole spacing) make it an excellent choice for use on water cooling radiators or as a case fan. Through advanced aerodynamic design features such as Flow Acceleration Channels, the NF-A14 achieves even better silent cooling performance compared to the multiple award-winning NF-P14. The ULN version allows for nearly silent operation with its super-low speed options (800/650rpm), making it perfect for ultra-low noise applications and particularly noise-sensitive users.