Noctua NF-A4x20 FLX 40mm Fan
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua's AAO frame, the NF-A4x20 FLX is a highly optimized, premium quality quiet fan in 40x10mm size. Smooth Commutation Drive technology and Noctua's reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, a Low-Noise Adapter and OmniJoin Adapter Set as well as 6 years manufacturer's warranty, the NF-A4x20 is a premium choice for the highest demands.
Noctua NF-A4x20 FLX Features
The NF-A4x20 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.
Thanks to its streamlined, compact motor design, the NF-A4x10's motor hub is smaller than with conventional 4cm fans. This allows for more blade surface area and thus contributes to the NF-A4x10's superior airflow and pressure performance.
Noctua's AAO (Advanced Acoustic Optimization) frames feature integrated anti-vibration pads as well as Noctua's proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan's performance/noise efficiency.
Noctua's Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space restricted environments.
With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.
Integrated Anti-Vibration Pads made from extra-soft silicone minimize the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.
The NF-A4x20 features the further optimized second generation of Noctua's renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilization, precision and durability.
Providing 5000, 4400, and 3700 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise adaptors, the NF-A4x20 FLX (Flexibility) can be fine-tuned for superior airflow or maximum quietness.
The NF-A4x20 comes with an adaptor from 3-pin Molex to the 2-pin connectors used on many graphics cards or network and storage devices. An integrated diode provides polarity protection on 2-pin connections.
Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20 comes with Noctua's OmniJoin Adaptor Set. Just cut the original fan's cable, fix it to the adaptor using the supplied 3M Scotchlok™ connectors and you can plug the NF-A4x20 to proprietary fan headers!
The fan's short 20cm primary cable minimizes cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved and the supplied 3:4 pin adaptor allows the connection to the fan directly to the power supply.
Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A4x20 features an MTBF of more than 150.000 hours rating and comes with a full 6 years manufacturer's warranty.
Noctua NF-A4x20 FLX Specifications
|Noctua NF-A4x20 FLX|
|Mounting hole spacing||32x32 mm|
|Connector & pin configuration
|Cable length||20cm + 30cm NA-EC1 extension cable|
|Blade Geometry||A-Series with Flow Acceleration Channels|
|Frame Technology||AAO (Advanced Acoustic Optimization)|
|Rotational Speed (+/- 10%)||5000 RPM|
|Rotational Speed with L.N.A. (+/- 10%)||4400 RPM|
|Rotational Speed with U.L.N.A. (+/- 10%)||3700 RPM|
|Airflow with L.N.A.||8.3 m³/h|
|Airflow with U.L.N.A.||6.9 m³/h|
|Acoustical Noise||14.9 dB(A)|
|Acoustical Noise with L.N.A.||12.2 dB(A)|
|Acoustical Noise with U.L.N.A.||8.5 dB(A)|
|Static Pressure||2.26 mm H2O|
|Static Pressurewith L.N.A.||1.75 mm H2O|
|Static Pressure with U.L.N.A||1.23 mm H2O|
|Max. Input Power||0.6 W|
|Max. Input Current||0.05 A|
|MTBF||> 150,000 h|
|Scope of Delivery||
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