With advanced aerodynamic features such as Flow Acceleration Channels and Noctua's AAO frame, the NF-A4x20 FLX is a highly optimized, quiet, high-quality fan measuring 40x40x20 mm.
The FLX version includes Low-Noise Adaptors for speed adjustment at 5000/4400/3700 rpm and includes the OmniJoin Adaptor Set for connection to fan headers. The extremely smooth operation, top-tier SSO2 bearing, and Noctua's superior quality and reliability make the fan a top choice for the highest demands.