Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)
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joseph hussey
> 3 dayBest fan Ive ever used
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civilmann
> 3 dayGreat Fan very quiet!
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Buyer51
> 3 dayVery Quiet. Much more quiet than the fan it replaced. Better airflow.
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Jean-Guy Poirier
Greater than one weekExactement ce dont javais besoin
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James Thompson
Greater than one weekThey guys do it right from the packaging to the adapters to the rubber mounting system. Its very well thought out. I used it to quiet down my Amcrest NVR, which sounding like a drone. A slight mode on the hole size on one bracket was all that was needed. Id say it dropped 20db.
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Ricardo
> 3 dayawesome little fan. vewy vewy quiet...
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Karen Kent
> 3 dayNow that this has been in use for a while I can say it makes no noise at all even though it blows quite a bit. In some applications the vibration reduction little rubber bits would have to be removed. In my application I had to cut the wire and attach it to a different connector because there wasnt enough room. Theres no way to get to the board directly to solder it but this appears to be part of the design to keep dust out.
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Mike
> 3 dayI was very impressed with the packaging, quality and all the multiple adapters that came with this unit for the price...however, with all these added components (and I love the low noise adapter idea/adapter) the black 3 pin connector it comes with is too large for the boards female white connection in my DS411+. So...I had to clip the existing white 3 pin connector from my old fan and the new black 3 pin one from the new fan and join them manually to make this work. Not a deal-breaker and worked nicely, but took more time, unreturnable damage and work...hence the 4 star review. I wanted to also note that I did not receive any CPU fan alerts from my server as someone else noted...he said he just disabled the alert...which is not a good idea lol. Otherwise...this unit is stellar! I added a photo of the 3 pin and two pin it comes with...the 3 pin in my server is about the size of their 2 pin for reference
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Ken Beahan
> 3 dayNot much to say. They are dead silent and work flawlessly.
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Bill Abney
18-04-2025I have got to say, these Noctua fans are amazing. I put 3 of them in a security System DVR that I have. The security system is a Lorex, and the factory fans are incredibly loud, and dont last. I kept having to send the DVRs back to Lorex for replacement, do to the cooling fans going out. Iam on my 4 th. DVR replacement. I finally got tired of sending them back, just for cooling fan problems. So, I took matters into my own hands. I researched cooling fans, and found the Noctua. Yes they are a little pricey, I think I gave around $50.00 on Amazon.com, for three. It was the best $50.00, I have spent. These fans are so quiet, compared to those crazy cheapies Lorex uses....If you are having cooling fan issues in your electronic devices, give Noctua a try, you will be amazed.
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x10 FLX is a highly optimised, premium quality quiet fan in 40x10mm size. Smooth Commutation Drivetechnology and Noctua’s reference class SSO2 bearings ensure superb running smoothness and excellent long-term stability. Topped off with modular cabling and a Low-Noise Adaptor and OmniJoin Adaptor Set, the NF-A4x10 is a premium choice for the highest demands.
AAO frame
Noctua"s AAO (Advanced Acoustic Optimisation) 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.
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Flow Acceleration ChannelsThe NF-A4x10 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. |
SSO2 BearingThe NF-A4x10 features the further optimised 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 stabilisation, precision and durability. |
Integrated Anti-Vibration PadsIntegrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks. |
Inner Surface MicrostructuresWith 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. |
Reduced motor hub size
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.
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| NF-A4x10 PWM | NF-A4x10 FLX | NF-A4x10 5V PWM | NF-A4x10 5V | |
| Connector | 4-pin PWM | 3-pin | 4-pin PWM | 3-pin |
| Voltage | 12 V | 12 V | 5V | 5V |
| RPM | Max: 5000 / Min: 1000 | 4500 | Max: 5000 / Min: 1000 | 4500 |
| RPM with L.N.A. | 3700 | 3700 | - | - |
| Acoustical Noise | 19,6 dB(A) | 17,9 dB(A) | 19,6 dB(A) | 17,9 dB(A) |
| Acoustical Noise with L.N.A. | 12,9 dB(A) | 12,9 dB(A) | - | - |
| Size | 40x40x10 mm | 40x40x10 mm | 40x40x10 mm | 40x40x10 mm |
| Colour | Brown & Beige | Brown & Beige | Brown & Beige | Brown & Beige |