Noctua NF-A4x20 PWM premium-quality quiet 40mm fan
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<b>[Product Information]</b><br>
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<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 servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs</li>
<li>4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor)</li>
<li>Includes anti-vibration mounts, fan screws, extension cable, y-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>
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