Noctua NF-A4x20 PWM Premium Quiet 40mm Case Fan

Upgrade your cooling setup with the Noctua NF-A4x20 PWM, a premium quiet fan designed for high-performance environments. This 40x20mm fan is an ideal solution for 1U servers or for replacing fans in network and storage equipment like routers, switches, and NAS devices. It also works well in DVRs and other small electronics requiring reliable thermal management. Built with the award-winning A-series design, this fan utilizes Flow Acceleration Channels and an Advanced Acoustic Optimization frame. These elements work together to provide superior quiet cooling performance. With a maximum speed of 5000 RPM and a low noise level of just 14.9 dB(A), you get effective airflow without the disruptive sound. The 4-pin PWM version allows for automatic speed control via your device's fan headers, giving you precise control over thermal management. With a high MTTF of over 150,000 hours, this fan is built for long-term stability in demanding hardware configurations.