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Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 is a highly optimised, premium-quality quiet fan in size 40x20mm. The FLX version provides 5000/4400/3700rpm speed settings via the supplied Low-Noise Adaptors and includes the OmniJoin Adaptor Set for easy connection to proprietary fan headers. Its superb running smoothness, reference-class SSO2 bearing and Noctua’s trusted premium quality make it an elite choice for the highest demands.
40x20mm size
Compared to Noctua’s award-winning NF-A4x10, the NF-A4x20 is twice as thick, which allows for increased static pressure performance and makes the NF-A4x20 ideal for demanding applications with high flow resistance.
Flow Acceleration Channels
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.
SSO2 Bearing
The NF-A4x20 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 Pads
Integrated 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.
Scope of delivery
- NA-RC10 Low-Noise Adaptor (L.N.A)
- NA-RC12 Ultra-Low-Noise Adaptor (U.L.N.A)
- NA-EC2 30cm extension cable
- OmniJoin adaptor set
- 4x NA-AV3 anti-vibration mounts
- Fan screws
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.
Dimitar Sokolov
Reviewed in the United States on September 14, 2024
I have bought lots of these over the years, and as is typical for Noctua you're getting a high quality product that is QUIET. I bought these fans to replace the ones on a network switch since I know Noctua is quieter, and while they did not work on the switch I intended them for because the switch is wired different, I used them in another one and they work perfectly.Yes some may say they don't flow as much as the industrial grade, super loud fans that come with them, but in a home environment that matters much less and I'd rather have peace and quiet thanks to Noctua.That being said, this is a small fan, small fans spin faster and are louder by nature, so I'd still recommend either using the included Low Noise Adapter Cable (labeled in the box), or implementing some sort of fan control. At 50% speed these are basically whisper quiet, and move some decent air. I also have the PWM versions of these which are easier to control for speed, but you get the idea.One small con is that the rubber dampener things that come with these are basically useless because they don't seem to stay in on the small fans. I've used them on the 120mm fans and they work fine but for these they don't really work as well and the fan slips off.
Was good delivered and nice materials
Reviewed in the United Arab Emirates on March 28, 2024
Its nice for the small pc
Mr. Cynical
Reviewed in the United States on December 20, 2024
THIS IS A GREAT PRODUCT, but it is NOT going to help reduce the noise of rack mounted hardware.The thing about rack mounted computers and switches is they're intended to be extremely reliable and robust. This means the fan controllers are wired to monitor and maintain speed. This means:1. The wire pinout is different than this product and this fan will not spin.2. Using an adapter to the correct pinout still doesn't make the fan work.3. The hardware fan controlller monitors fan speed and defeats the resistor dongles by increasing voltage to compensate, resulting in precisely the same RPM anyway.My Dell brand switch just sat there with a red light, refusing to boot. Granted, Dell uses propriety connectors for everything to force consumers to purchase only their products, but this is a fan with a standard connector.Plugging this fan into a PC and 3D printer works perfectly and the fan is VERY QUIET compared to other fans it's size.
Toby Johnson
Reviewed in the United Kingdom on December 2, 2024
Just received order supposed to be brand new and seal was broken boxes flap looked like it had been opened and fan is not facing the display boxes opening at front. it’s upside down and the anti vibration mount is bent out of pack and looks damaged
Customer
Reviewed in Canada on November 23, 2024
I used one of these to replace the stock fan in an ART SLA 1 - two channel amp. It had an annoying whine before and ran too fast. This was a perfect fit and came with a nice set of inline speed reducer adapters. Dead quiet now.
Patrick
Reviewed in the United States on November 15, 2024
I purchased an unmanaged 5 port, 10gbe / 100gbs network switch to put in my makeshift networking closet. Closet is about 6 feet from my work station. Switch works GREAT, but has a 40mm fan that is legit 40db loud on the tech sheet for it but more like 50db in real life which is like having a conversation with a person loud.To remedy the issue, I purchased this fan. The fan itself is of the high quality and acumen for brown color tones one would expect from Noctua, so I'm not even going to touch on that.What is the most amazing about this purchase is everything else it comes with the kit and how Noctua caters to the primary use case for their customers here.My OEM fan has a 2 pin connector to the PCB. Noctua includes a converter so you can splice the OEM 2 pin together with the converter that plugs into the 3 pin coming from the fan. In addition, Noctua provides 3 tool-less (mostly) connectors for the splice. When you crush them down it squirts some kind of non conductive oil into the connections to protect it from water and dust. Made by 3M, but nevertheless a WELL thought out solution to include for their customers.Running at 4000+ rpm is extremely unnecessary for this network switch & since silence is the name of the game for me a way to reduce RPM without implementing a PWM controller in my limited space configuration. Another whammy from Noctua for this problem. Two RPM cables are included that step down the rpm without the need for a separate controller. I used the ultra low noise cable. It reduce the noise some, but the fan itself made such a difference that alone should do the trick for most people.I've purchased a lot of PC components and networking hardware over the years. Not sure I've ever felt like a company thought this much about their customer for something that costs such a small amount of money. The time and frustration they saved me is immeasurable and priceless.Good job Noctua:-)
Amir Ibraimov
Reviewed in Japan on January 17, 2023
Used it for mini ITX computer power supply, oh boy it's so quiet that my own breath is louder than the working power supply now
Abyss
Reviewed in Australia on July 20, 2021
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