Noctua NF-A4x20 5V premium-quality quiet 40mm fan<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance</li><li>40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers， switches， NAS etc.) or other devices such as DVRs</li><li>5V 3-pin version (5000rpm) for 5V-based industrial applications or replacing 5V fans in various devices</li><li>Includes anti-vibration mounts， fan screws， extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers</li><li>Trusted Noctua quality backed up with 6-year manufacturer’s warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51eg7xyixjL.jpg" noproxy>