Noctua NF-A4x10-PWM Fan 40x40x10mm

This Noctua NF-A4x10-PWM is a small but serious 40 mm fan, aimed at situations where space is critical – compact cases, mini-ITX systems, networking and server equipment. With a thickness of only 10 mm and PWM control via a 4-pin connector, you can set it to spin according to your needs, rather than constantly at maximum. It operates at up to 5000 RPM, with a noise level of only 19.6 dBA, which is a good balance for such a small format. The SSO2 bearing and declared lifespan of 150,000 hours indicate that it is made for long and continuous operation.

What you get is a compact 40 x 40 x 10 mm solution for airflow exactly where standard 120/140 mm fans simply do not fit. The flow rate of 8.9 m³/h and static pressure of 1.95 mmH2O make it suitable for cooling areas with denser perforation or small radiators. Through 4-pin PWM, you can keep it quiet at low speeds during idle and ramp it up only under load when component temperatures rise. The low consumption of 0.48 W at 12 V and current of only 0.04 A is a plus if you have many small fans in one system or a power line limitation. Combined with a long warranty of 72 months, this is a fan you install and forget.

• Compact dimensions of 40 x 40 x 10 mm, ideal for mini-ITX cases, networking devices, and tight spaces.
• Maximum speed up to 5000 RPM, allowing good airflow for the size and quick response to rising temperatures.
• Airflow of 8.9 m³/h, suitable for localized cooling in areas with limited ventilation.
• Static pressure of 1.95 mmH2O, helping air pass through dense grilles and elements with higher resistance.
• Low noise level of 19.6 dBA, which is important for a 40 mm fan if the system operates close to you.
• SSO2 Bearing and MTBF of 150,000 hours, designed for long-lasting, 24/7 operation.
• 4-pin PWM connector for precise speed control based on temperature and load.

This fan is suitable if you are building a compact system, organizing airflow in a small case, or looking for reliable cooling for a router, NAS, microserver, or other networking/embedded device. If you need basic airflow for a large gaming case, the 40 mm form factor is not a suitable primary solution – here its role is more supplementary and directed.

The strongest aspect of this model is the combination of very small size, PWM control, and long life with the SSO2 bearing, so you can confidently use it in critical and hard-to-reach systems where reliability is more important than anything else.