Premium quiet fan 40x40x20 mm 12V 3-pin Molex 5000/4400/370 RPM max. 14.9 dB (A) >150 000 h MTTFAward-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers switches NAS etc. ) or other devices such as DVRs3-pin FLX version provides 5000/4400/3700rpm speed settings via Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operationIncludes anti-vibration mounts fan screws extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers