Best current price£12.98from Scan Computers
Shopping.co.uk recommended and popular offers
Scan Computers£12.98Visit shop Noctua 40Mm Fan Nf-A4x20 Flx
Visit shop
Amazon£13.95Visit shop Noctua NF-A4x10 5V PWM, High-Performance Quiet Fan 40mm
Visit shop28 offers from £12.98 - £29.98
View price history by clicking the chart icon.
1 offer from £15.00
View price history by clicking the chart icon.
The Noctua NF-A4x20 FLX is a premium 40x20mm cooling fan engineered for enthusiasts and professionals who need reliable, quiet airflow in compact spaces like 1U servers, network switches, and NAS devices. It offers exceptional versatility through its three-speed RPM flexibility, ensuring that users can balance noise levels with cooling performance, though its specialized 20mm thickness may require careful clearance checks in extremely tight chassis builds.
| Model Part Number | NF-A4x20 FLX |
|---|---|
| Brand | Noctua |
Yes, its 40x20mm dimensions and high static pressure are specifically optimized for 1U server chassis and network equipment.
No, the FLX model uses 3-pin headers and relies on included voltage-step adapters to change speeds.
The NF-A4x20 FLX features Noctua's SSO2 bearing, which is designed for a mean time between failures of over 150,000 hours.
You can manually change the speed by connecting the fan directly to the power source or by inserting one of the included Low-Noise Adaptors (L.N.A.).
It is user-friendly; it allows you to splice the fan wires to your existing connector without needing to solder, provided you follow the included instruction manual.
Check for loose cabling hitting the blades or ensure the anti-vibration mounts are properly seated.
Verify the wiring polarity using the OmniJoin adapter kit and ensure the header provides constant voltage.
Ensure the fan is connected to a header that supports tachometer readings, or disable the fan monitoring check in the device BIOS/firmware.
Installation is straightforward using the included anti-vibration mounts or traditional fan screws. Before mounting, verify that the 40x20mm dimensions fit your specific hardware housing, as some 1U devices are designed for thinner 10mm fans. For proprietary headers, use the OmniJoin adapter kit by crimping the wires to match your original connector. Maintenance is minimal; however, it is recommended to periodically clean dust from the blades and inlet frame using compressed air to maintain optimal aerodynamic efficiency and prevent motor strain.
