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Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)

4.8 4.8 out of 5 stars 10,379 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer Case Fans by Noctua

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About this item

  • Premium quiet fan, 40x40x10 mm, 12V, 3-pin Molex, 4500/3700 RPM, max. 17.9 dB(A), >150,000 h MTTF
  • Award-winning 40x10mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
  • Ideal replacement for noisy or broken 12V 4cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc.
  • 3-pin 12V FLX version can be run 4500 or 3700 rpm using the supplied Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
  • Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers
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Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)
Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)
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Price$13.95$14.95$10.99$14.95$12.98$8.99
Delivery
Get it as soon as Wednesday, Apr 3
Get it as soon as Wednesday, Apr 3
Get it as soon as Wednesday, Apr 3
Get it as soon as Wednesday, Apr 3
Get it as soon as Wednesday, Apr 3
Get it as soon as Wednesday, Apr 3
Customer Ratings
Noise level
4.8
4.2
3.6
4.8
3.8
3.7
Easy to install
4.7
4.2
4.4
4.8
4.7
Quality of material
4.8
4.5
3.6
4.7
Value for money
3.6
4.6
4.2
4.2
Sold By
Noctua Cooling Solutions
Noctua Cooling Solutions
GZHD
Noctua Cooling Solutions
PLUSPOE
CLELO Direct
cooling method
Air
Air
Air
Air
Air
Air
power connector type
3-Pin
4-Pin
2-Pin
3-Pin
2-Pin
2-Pin
compatible devices
Printer
Desktop
Printer
Desktop
Desktop, Printer, Server
Printer
air flow capacity
8.2 cubic meters per hour
9.4 cubic meters per hour
7.56 cubic feet per minute
max rotational speed
4500 rpm
5000 rpm
5700 rpm
5000 rpm
6800 rpm
5700 rpm
noise level
17.9 decibels
19.6 decibels
25.3 decibels
14.9 decibels
27.5 decibels
25 decibels
material
Fibre-glass reinforced PBT
Fibre-glass reinforced PBT
Glass
Fibre-glass reinforced PBT
Plastic

Product Description

NF-A4x10 FLX header

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.

5V PWM version

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.

NF-A4x10 FAC

SSO2

NF-A4x10 AVP

NF-A4x10 ISM

Flow Acceleration Channels

The 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 Bearing

The 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 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.

Inner Surface Microstructures

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.

NF-A4x10 banner

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.

NF-A4x10 PWM table NF-A4x10 FLX table NF-A4x10 5V PWM table NF-A4x10 5V table
NF-A4x10 PWM NF-A4x10 FLX NF-A4x10 5V PWM NF-A4x10 5V
Customer Reviews
4.8 out of 5 stars
1,596
4.8 out of 5 stars
10,379
4.7 out of 5 stars
785
4.8 out of 5 stars
3,512
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

Product information

Technical Details

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Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

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Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
10,379 global ratings

Customers say

Customers like the quality, performance, and connectors of the electronic component fan. For example, they say it's a high quality fan that works well, and comes with several adapters. Customers are also impresseded with the adapters, saying it provides excellent airflow. Overall, customers are happy with their purchase and recommend it to others.

AI-generated from the text of customer reviews

738 customers mention648 positive90 negative

Customers like the noise of the electronic component fan. They say it's super quiet, an improvement over the fan noise and heat generated, and runs very quietly. The fans move a ton of air for how silent and small they are, and the sound reduction is outstanding and truly worth the price.

"...In almost every scenario I’ve experienced excellent airflow, huge noise reduction and not a single meltdown thus far...." Read more

"...WOW!!! this fan is super quiet. It is 15-20db quieter than the OEM fan (in my new CCTV DVR)...." Read more

"...and everything went quickly, no issues and now my NVR is running very quietly and the internal temperature is down...." Read more

"...The frame of the fan features a rubberized edge to help reduce noise, a smaller fan hub size which allows for more room for bigger blades on the fan..." Read more

296 customers mention287 positive9 negative

Customers are impressed with the quality of the fan. They say it's a high quality fan, and the components arrived in a sturdy and well-laid out plastic. They also say it moves a lot of air and is super quiet. Customers also say that it drastically improves measured temps. They are happy with the fan's quality and performance, and mention that it has not had a single meltdown.

"...The fans are super secure, super quiet, super efficient, they have accessories that REALLY helped my scenario. I couldn't be happier!..." Read more

"...I’ve experienced excellent airflow, huge noise reduction and not a single meltdown thus far...." Read more

"This fan and its components arrived in a very sturdy and well laid out plastic container, inside of the box...." Read more

"...I used this fan in my NVR and it moves a lot of air and is super quite." Read more

199 customers mention173 positive26 negative

Customers like the performance of the fan. They mention that it works well, is absolutely silent, and is a direct replacement for the stock motherboard fan. The fan is quiet even at maximum speed, and completely solves the problem. It is also super secure, super quiet, and efficient. Customers also appreciate the Omnijoin connector, which works well to connect the stock fan cable to the 3 pin of the product.

"...The fans are super secure, super quiet, super efficient, they have accessories that REALLY helped my scenario. I couldn't be happier!..." Read more

"...adapter for this (and several others) and everything went quickly, no issues and now my NVR is running very quietly and the internal temperature is..." Read more

"...Very low vibration, and worked like a charm on my camera!" Read more

"As expected, has worked flawlessly in my voron hotend, even at chamber temps.Love noctua fans...." Read more

190 customers mention182 positive8 negative

Customers like the connector on the electronic component fan. They say it comes with several adapters, attachments, and hardware. Customers also mention that the cables and accessories provided are exceptional and cover just about every scenario.

"...There are four included rubbery inserts that you put through the case holes for your unit. In this case, I only needed two per fan...." Read more

"...your doing the Noctua makes retrofitting a breeze and comes with just about everything you could concievably need to shoe it in to any kind of build..." Read more

"...During unboxing, I found that it was well stocked with mounting screws, isolation mounts, various wiring harnesses and adapters...." Read more

"...The frame of the fan features a rubberized edge to help reduce noise, a smaller fan hub size which allows for more room for bigger blades on the fan..." Read more

150 customers mention139 positive11 negative

Customers are satisfied with the efficiency of the electronic component fan. They mention that it provides very good airflow, is excellent, and is the best fan you can buy. Some say that the bearings, soft mounts, and good aerodynamics make for a very comprehensive fan kit.

"...These fans are fantastic, whisper quiet and provide very good airflow to my custom Raspberry Pi case...." Read more

"This fan is so good I can’t hear it make me believe it’s actually not running but every time I check it’s on lol" Read more

"...(powering off de-sync’s my dual lead screws so it just stays on) great little fan, quiet and effective as well as versatile, would highly recommend." Read more

"Nice fan, packaged well, with all the bells and whistles it seems...." Read more

142 customers mention109 positive33 negative

Customers like the air flow of the electronic component fan. They say it produces plenty of airflow and is quite silent. Some customers also say it moves more air than the original fan did, and that it pushes a ton of air for its tiny size. Overall, most are satisfied with the airflow performance of the fan.

"...In almost every scenario I’ve experienced excellent airflow, huge noise reduction and not a single meltdown thus far...." Read more

"Not much to review here. I used this fan in my NVR and it moves a lot of air and is super quite." Read more

"...for more room for bigger blades on the fan which in turn provides more airflow, and the blades themselves have special grooves and bumps to help..." Read more

"...The old fan moved a lot of air. The Noctua fan moves significantly less air. So much less air it actually makes me concerned...." Read more

121 customers mention88 positive33 negative

Customers like the value of the electronic component fan. They say it's well worth the price, easy to install, and saves money. Some mention that it'll save you time and money over buying a new switch or building a server room.

"...the price of another fan I saw on Amazon, but, in my opinion, WELL worth it...." Read more

"...Great value for the money. Totally quiet even at full speed!" Read more

"...it’s well worth the $15 price!..." Read more

"...The rubber adapters are made out of very poor material...." Read more

110 customers mention102 positive8 negative

Customers find the installation of the electronic component fan to be easy. They mention that the screws provided allow for easy replacement, and the extensive documentation on installation is excellent. They also say that the included accessories and instructions cover most installation needs, making retrofitting a breeze.

"...If you know what your doing the Noctua makes retrofitting a breeze and comes with just about everything you could concievably need to shoe it in to..." Read more

"...It is 15-20db quieter than the OEM fan (in my new CCTV DVR). Installation was very easy..." Read more

"...fan comes with directions that are easy-to-read and installation is simple the screws supplied allow you to replace an existing fan and still have a..." Read more

"...Very easy to install, with the only tricky part being the replacement of the power connector with the one I cut off the ZWO fan...." Read more

Noctua Is My Server Noise Savior
5 Stars
Noctua Is My Server Noise Savior
For some time these fans have been firmly known in the universe of custom water cooled PCs with glowing lights and fancy cable wrap for gaming and so forth.Now, I’m not that kinda guy but over the years I’ve purchased dozens of these these either as 3-pin or 4-pin PWM as well as the a4x20 model and so on and absolutely love them.Here’s why:I work from home and also have a home lab with a lot of enterprise equipment that would be traditionally found in a Server farm. If you’ve ever been in a Server room, you know how loud we are talking here. These manufacturers simply cram in the cheapest, biggest, loudest fan they can find. ‘Better to protect the hardware’ is their line of thinking. But, why can’t we have it all?A lot of people with Server gear at home mitigate this issue by buying an incredibly expensive and large soundproof Server Cabinet. Me, I’d like to handle the issue at the source if I can manage close to the same airflow using more quiet fan technology. Keep in mind I said close to. You won’t be able to get the same CFM as a 28mm San Ace running at 7,200 rpms but then again you may not need it. However a Noctua at 4,700rpm could be more than adequate. In a home environment there’s much more control over various active / passive cooling methods and you won’t see necessarily the same kind of workload. Also, ive found that even 2x a4x10 at 4,700rpm is quieter (and the noise is of a less irritating pitch) than some of the 7,200rpm and up fans I’ve encountered.Anyhow, while the benefits are great you also must be responsible for fine tuning for your application and paying close attention to system / internal temperatures to ensure the quiet fans are adequate. This could mean a better layout in the chassis, getting better airflow in your rack, heatsinks, and so on... not just fans. So, consider that my disclaimer. Use your head and get the data you need to make an informed decision.If you know what your doing the Noctua makes retrofitting a breeze and comes with just about everything you could concievably need to shoe it in to any kind of build / scenario you can think of. The extras every Noctua comes with may seem excessive to some, but even if you don’t use them immediately they’ll save you in a pinch if you keep them in a spares drawer.In almost every scenario I’ve experienced excellent airflow, huge noise reduction and not a single meltdown thus far. Whenever I’ve done a before and after and clocked temperatures I’ve seen this particular 4,700rpm fan outperform generic faster spinning fans that supposedly have superior CFM. Instead of using the low noise adapters I frequently utilize a separate manual fan controller so I can dial in just the right mix of noise / speed / airflow for a given application. See the photos I’ve provided for where I’ve done exactly this with Supermicro M28SACB cages, disabling the on board fan control. However, you can also get a PWM fan (I’d use the a4x20 in that case) and use Supermicro’s fan and temperature control features.So, even though it’s a home environment the use cases aren’t mild. I’m talking 48 disk raid arrays that I’ve gotten cool as a cucumber AND quiet as a church mouse.In the other photo I posted it’s my latest application retrofitting 4x A4x10 into a Sonnet Tech xMac mini rack mount Server. I’ve also successfully used these fans or similar models in all kinds of other gear. Again, doing a before and after of internal and drive temps is the only way you can determine if this solution can work for you. Don’t be careless- heat is a noble foe.Noctua, I don’t know what I’d do without you. My world would be unbearably loud.However, one small complaint Noctua if you’re listening: you’ve moved from the standard silicone vibration mounts to what you call the NA-AV3. This is the first time I’ve received these so I’m assuming it’s a fairly new change. I find them a bit fiddly and less easy to use compared to their predecessor. It also makes it more difficult to shoe-in with various retrofits because it has no flat side.... although I can work around it. I’m guessing they help with some use case I’m unaware of because I don’t see the utility at all in the change. Also, the stock at amazon seems to be a variety of the older and newer models as it’s been a toss up which kind I wound up with on my last order.
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Top reviews from the United States

Reviewed in the United States on December 11, 2013
10 people found this helpful
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Reviewed in the United States on March 4, 2019
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5.0 out of 5 stars Noctua Is My Server Noise Savior
Reviewed in the United States on March 4, 2019
For some time these fans have been firmly known in the universe of custom water cooled PCs with glowing lights and fancy cable wrap for gaming and so forth.

Now, I’m not that kinda guy but over the years I’ve purchased dozens of these these either as 3-pin or 4-pin PWM as well as the a4x20 model and so on and absolutely love them.

Here’s why:

I work from home and also have a home lab with a lot of enterprise equipment that would be traditionally found in a Server farm. If you’ve ever been in a Server room, you know how loud we are talking here. These manufacturers simply cram in the cheapest, biggest, loudest fan they can find. ‘Better to protect the hardware’ is their line of thinking. But, why can’t we have it all?

A lot of people with Server gear at home mitigate this issue by buying an incredibly expensive and large soundproof Server Cabinet. Me, I’d like to handle the issue at the source if I can manage close to the same airflow using more quiet fan technology. Keep in mind I said close to. You won’t be able to get the same CFM as a 28mm San Ace running at 7,200 rpms but then again you may not need it. However a Noctua at 4,700rpm could be more than adequate. In a home environment there’s much more control over various active / passive cooling methods and you won’t see necessarily the same kind of workload. Also, ive found that even 2x a4x10 at 4,700rpm is quieter (and the noise is of a less irritating pitch) than some of the 7,200rpm and up fans I’ve encountered.

Anyhow, while the benefits are great you also must be responsible for fine tuning for your application and paying close attention to system / internal temperatures to ensure the quiet fans are adequate. This could mean a better layout in the chassis, getting better airflow in your rack, heatsinks, and so on... not just fans. So, consider that my disclaimer. Use your head and get the data you need to make an informed decision.

If you know what your doing the Noctua makes retrofitting a breeze and comes with just about everything you could concievably need to shoe it in to any kind of build / scenario you can think of. The extras every Noctua comes with may seem excessive to some, but even if you don’t use them immediately they’ll save you in a pinch if you keep them in a spares drawer.

In almost every scenario I’ve experienced excellent airflow, huge noise reduction and not a single meltdown thus far. Whenever I’ve done a before and after and clocked temperatures I’ve seen this particular 4,700rpm fan outperform generic faster spinning fans that supposedly have superior CFM. Instead of using the low noise adapters I frequently utilize a separate manual fan controller so I can dial in just the right mix of noise / speed / airflow for a given application. See the photos I’ve provided for where I’ve done exactly this with Supermicro M28SACB cages, disabling the on board fan control. However, you can also get a PWM fan (I’d use the a4x20 in that case) and use Supermicro’s fan and temperature control features.

So, even though it’s a home environment the use cases aren’t mild. I’m talking 48 disk raid arrays that I’ve gotten cool as a cucumber AND quiet as a church mouse.

In the other photo I posted it’s my latest application retrofitting 4x A4x10 into a Sonnet Tech xMac mini rack mount Server. I’ve also successfully used these fans or similar models in all kinds of other gear. Again, doing a before and after of internal and drive temps is the only way you can determine if this solution can work for you. Don’t be careless- heat is a noble foe.

Noctua, I don’t know what I’d do without you. My world would be unbearably loud.

However, one small complaint Noctua if you’re listening: you’ve moved from the standard silicone vibration mounts to what you call the NA-AV3. This is the first time I’ve received these so I’m assuming it’s a fairly new change. I find them a bit fiddly and less easy to use compared to their predecessor. It also makes it more difficult to shoe-in with various retrofits because it has no flat side.... although I can work around it. I’m guessing they help with some use case I’m unaware of because I don’t see the utility at all in the change. Also, the stock at amazon seems to be a variety of the older and newer models as it’s been a toss up which kind I wound up with on my last order.
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8 people found this helpful
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Reviewed in the United States on January 27, 2024
2 people found this helpful
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Reviewed in the United States on February 18, 2024
Reviewed in the United States on February 12, 2024
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Top reviews from other countries

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Roberto
5.0 out of 5 stars Ventilador muy silencioso pero bastante caro para mi gusto.
Reviewed in Spain on December 7, 2023
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Roberto
5.0 out of 5 stars Ventilador muy silencioso pero bastante caro para mi gusto.
Reviewed in Spain on December 7, 2023
Compre el ventilador de 40mmx10mm para mi ya mítica anet A8. Quise probar a ver si es cierto que es tan silencioso y he de decir que me ha sorprendido. Un muy buen ventilador, silencioso, muy bien presentado y funciona de muerte. Lo malo... el precio. Lo he comprado como un capricho para probar y bajar un poco el ruido de la impresora, pero he de reconocer que los hay mucho más baratos. 15€ por un ventilador de este tipo es una burrada, ahora, es una pasada de ventilador.
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One person found this helpful
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Matt M.
5.0 out of 5 stars Whisper-Quiet Marvel with an Impressive Array of Accessories
Reviewed in the United Kingdom on September 20, 2023
4 people found this helpful
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Lampjesman
5.0 out of 5 stars Noctua fan voor mega s
Reviewed in the Netherlands on May 3, 2023
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Lampjesman
5.0 out of 5 stars Noctua fan voor mega s
Reviewed in the Netherlands on May 3, 2023
Past perfect in een anycubic mega s ! Wat een zee van rust , geen lawaai meer!
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Kenny Johansson
5.0 out of 5 stars Tyst bra fläkt.
Reviewed in Sweden on September 4, 2023
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Kenny Johansson
5.0 out of 5 stars Tyst bra fläkt.
Reviewed in Sweden on September 4, 2023
Bytte till tystare fläktar till en av mina UniFi swishar. Inte lika mycket luft flöde som orginal men mycket tystare. Finns plats för sätta in två till om det så behövs.
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ines
5.0 out of 5 stars che spettacolo di ventola
Reviewed in Italy on May 9, 2021