The NL-ACF1 is an auxiliary cooling fan for Noctua’s NL-LC1 series all-in-one liquid coolers. Installed on top of the CPU block, it provides extra cooling for VRMs, RAM, M.2 SSDs, and other near-socket components. Its large, highly optimized NF-A8 impeller delivers significantly more airflow at lower noise levels compared to smaller VRM fans. Leveraging the Coandă effect, the NL-ACF1’s outer frame has been custom-designed to draw as much air out toward the components as possible. The fan can be easily adjusted from near-silent operation to maximum cooling via PWM, either at a fixed speed setting or through automatic control by the motherboard. Attaching magnetically to the top of the CPU block, it is extremely straightforward to install. In sum, the NL-ACF1 is a perfect add-on for Noctua NL-LC1 series coolers that are running in systems that could benefit from extra airflow over near-socket components.