Noctua 40x40x10 4500/3700rpm NF-A4x10 FLX Fan

Are you looking for a small but serious fan for tight spaces, mini cases, or specific mods? Noctua NF-A4x10 FLX is a 40 x 40 x 10 mm fan that focuses on reliability and control rather than cheap noise. It operates in the range of 3700 – 4500 RPM, providing up to 4.83 CFM airflow while maintaining a noise level of only 17.9 dBA. The typical brown design of Noctua is not accidental – the focus here is entirely on long life and stability.

What you get

This is a 40 mm fan with a thickness of only 10 mm, allowing you to fit it into super tight spaces – small cases, routers, NAS boxes, network equipment, or custom projects. Thanks to the SSO2 bearing, an MTBF of 150000 hours, and a low amperage of 0.05 A, you can leave it running 24/7 without worrying about its durability. Operating at 12 V with a consumption of only 0.6 W means minimal load on the power supply, and the 3 PIN connector ensures standard compatibility with most motherboards and controllers. The package also includes a 3:2-Pin adapter, OmniJoin kit, and a 30 cm extension cable, which is convenient if you need to connect it to a non-standard connector or a more distant point in the system.

• Compact format 40 x 40 x 10 mm, suitable for mini-ITX cases, network equipment, and tight spaces.
• Speed range 3700 – 4500 RPM, providing a balance between airflow and noise control depending on the situation.
• Airflow up to 4.83 CFM / 8.2 m3/h, sufficient for cooling small volumes of air and local hot spots.
• Low noise level of only 17.9 dBA, which is suitable for systems operating close to you – office, living room, bedroom.
• Reliable SSO2 bearing and MTBF of 150000 hours for long-term 24/7 operation.
• Low consumption – only 0.05 A at 12 V, with a power of 0.6 W, gentle on the power supply and electronics.
• Rich package: 4 anti-vibration mounts, 3:2-Pin adapter, OmniJoin kit, and 30 cm extension cable for flexible installation.

Who it is suitable for

It is suitable if you are looking for a quality 40 mm fan for compact systems, small cases, network devices, or specialized projects where reliability is more important than brutal airflow. It is not a reasonable choice if you need primary airflow for a large case or heavily heating components – for that, you need larger sizes.

The impressive combination of size, low noise, and very long life, plus the complete set of accessories, makes Noctua NF-A4x10 FLX one of the most sensible choices in the 40 mm class.