Noctua NF-A4x20 5V PWM Case Fan, 40 mm, Beige/Brown

The Noctua NF-A4x20 5V PWM is a 40x40x20 mm fan engineered for applications that require a 5V power source. It connects via a 4-pin PWM header, which allows for automatic speed control based on thermal requirements, with a rotational speed range of 1100 to 5000 RPM. This functionality provides a balance between cooling performance and low-noise operation in compact systems. The fan's 20mm depth enables it to generate up to 5.53 CFM of airflow and 2.26 mmH₂O of static pressure, making it suitable for enclosures with restricted ventilation or high impedance.

Constructed with a PBT frame, this fan incorporates Noctua's SSO2 bearing for long-term operational stability and reliability. It is primarily intended for system builders working on small form factor PCs, 1U servers, and other space-constrained devices where a 5V power source is standard. The package includes an OmniJoin adaptor set to facilitate connection to proprietary fan headers often found in network or storage equipment. Additionally, anti-vibration mounts are provided to help decouple the fan from the chassis and reduce operational noise.

• Measures 40x40x20 mm for compact installations
• Operates on a 5V power input with PWM control
• Features a speed range of 1100 to 5000 RPM
• Utilizes an SSO2 bearing for increased lifespan
• Includes an OmniJoin adaptor set for proprietary headers
• Provides anti-vibration mounts to reduce noise