heading

The NF-A20 is a highly optimised, premium quality quiet 200mm fan. Featuring an AAO (Advanced Acoustic Optimisation) standard frame as well as sophisticated aerodynamic design measures such as Flow Acceleration Channels, the NF-A20 brings the renowned quiet cooling performance of Noctua’s award-winning A-series to the increasingly popular 20cm form factor. The FLX version provides 800/550rpm speed settings via the supplied Low-Noise Adaptor in order to provide full flexibility in fine-tuning the fan for maximum ventilation performance or near-silent operation. Its superb running smoothness, reference-class SSO2 bearing and Noctua’s trusted premium quality make the NF-A20 an elite choice for the highest demands.
Please refer to our case compatibility list for detailed compatibility information.

Details
Award-winning Noctua quality in 20cm size

Award-winning Noctua quality in 20cm size

While more and more PC cases support 20cm intake, side-panel or exhaust fans, many of the bundled stock units and available aftermarket options are of questionable quality. By contrast, the NF-A20 is a true premium grade solution worthy of Noctua’s award-winning A-series.
154mm, 110x180mm and 170mm hole spacing

154mm, 110x180mm and 170mm hole spacing

In order to ensure broad compatibility with today’s PC cases, the NF-A20 features three sets of mounting holes: While the 154x154mm and 110x180mm spacing allow it to replace most 200mm fans, the 170x170mm spacing is used by many 230 and 250mm fans, which can thus also be replaced by the NF-A20.*
Flow Acceleration Channels

Flow Acceleration Channels

The NF-A20 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.
AAO frame

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.
Stepped Inlet Design

Stepped Inlet Design

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.
Inner Surface Microstructures

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.
Integrated anti-vibration pads

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 screws and other mounting systems.
Smooth Commutation Drive 2

Smooth Commutation Drive 2

The latest version of Noctua's advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the fan remarkably quiet even at very close distances.
Low-Noise Adaptor for full flexibility

Low-Noise Adaptor for full flexibility

The NF-A420 FLX (Flexibility) is supplied with a Low-Noise Adaptor (L.N.A.) that reduces the maximum fan speed from 800 to 550rpm so that it can be fine-tuned for superior airflow or maximum quietness.
Extensive cabling options

Extensive cabling options

The fan's short 20cm primary cable minimises 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 of the fan directly to the power supply.
SSO2 bearing

SSO2 bearing

The NF-A20 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.
6-year manufacturer’s warranty

6-year manufacturer’s warranty

Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A20 features an MTTF of more than 150.000 hours rating and comes with a full 6-year manufacturer’s warranty.
*As there is no fixed industry standard for the size or hole spacing of 200mm, 220mm, 230mm or 250mm fans, please see our case compatibility list and carefully check both the hole setup of your chassis and the available space (the NF-A20 is 30mm thick whereas some other 200mm fans are only 20mm!) in order to verify that the NF-A20 is compatible with your chassis. In case of doubt, please contact your chassis manufacturer.
NF-A20 FLX
General
Notes and warnings
Please refer to our case compatibility list for detailed compatibility information.

FAN Specification
Size
200x200x30 mm
Mounting hole spacing
154x154, 110x180, 170x170 mm
Connector
3-pin
Bearing
Blade Geometry
Rotational Speed (+/- 10%)
800 RPM
Rotational Speed with L.N.A. (+/- 10%)
550 RPM
Acoustical Noise
18,1 dB(A)
Acoustical Noise with L.N.A.
10,7 dB(A)
Static Pressure
1,08 mm H₂O
Static Pressure with L.N.A.
0,51 mm H₂O
Max. Input Power
0,96 W
Max. Input Current
0,08 A
Voltage
12 V
MTTF
> 150.000 h
Scope of delivery
  • Low-Noise Adaptor (L.N.A.)
  • 3:4-pin adaptor cable
  • 30cm extension cable
  • NA-AV3 anti-vibration mounts
  • NA-AV4 anti-vibration mounts
  • Fan screws
Warranty
6 years
NF-A20 FLX
A-Series fans
Video Reviews
The following video reviews have not been created by Noctua. Responsibility for the information and views expressed in the videos lies entirely with the authors.
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24.10.2017 // ThinkComputers.com
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NF-A20 FLX Review

Like we stated in the beginning, Noctua offers a great variety of fans and accessories, many of which we didn’t realized they produced. By taking a look at these not so common fan sizes, we have really opened up our eyes to the number of solutions Noctua is providing. Loud or dead fan in a Cisco switch? Swap it out for a compatible Noctua NF-A4x20 model. Need a slim 120mm fan for your low-profile CPU cooler? Check out the NF-A12x15 options. Looking for a compact solution to control the speed of a few fans? The NA-FC1 might do the trick. One thing that really impressed us was the 6-year warranty that each of the items we looked at comes with; not just the fans. We expect some type of warranty on a fan controller, but to have the same 6-year warranty on the tiny anti-vibration mounts, as well as the simple SATA to 4-pin fan adapter, is just fantastic.
Test verdict: "Color us impressed." (Ryan Kerschner, ThinkComputers.com)
04.10.2017 // NewEsc.com
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NF-A20 FLX Review

Das fans que recebemos o destaque vai provavelmente para a primeira fan mainstream de 200mm da Noctua que a introduz com dois modelos, PWM com 4-pin, para um melhor controlo da nossa parte, e o FLX com 3-pin apenas, para um controlo automático. As NF-A20 PWM e NF-A20 FLX seguem as linhas principais da companhia, integrando a melhor tecnologia Noctua. Desde a moldura AAO, para redução do ruído, ao controlador PWM NF-FD1 no caso da primeira, para garantir o melhor controlo das velocidades da ventoinha, e rolamentos SSO2 reconhecidos pela sua estabilização, precisão e durabilidade. Isto, com 6 anos de garantia do fabricante! A esta junta-se a nova ventoinha slim de 120mm, com apenas 15mm de espessura, perfeita para os radiadores no topo das caixas quando temos falta de espaço. E as ventoinhas de 40mm, com opção de 5v para menor velocidade e menor ruído. Vindo da Noctua só esperamos qualidade na hora de testar, em termos de fluxo de ar e ruído, a Noctua é das melhores companhias. A Noctua não se foca só nas ventoinhas, mas em tudo o que sirva estas no sistema. A companhia austríaca tem uma vasta oferta de adaptadores e acessórios de montagem. Alguns desses os seus extras acompanham mesmo as ventoinhas nas respectivas caixas, como os adaptadores LVA/LNA que ajudam a reduzir os níveis de ruído ao estrangular a voltagem. Mas o destaque desta vez vai mesmo para o Noctua NA-FC1, um pequeníssimo controlador de ventoinhas.
Test verdict: "A Noctua não desilude, demonstrando mais uma vez saber o que faz. A introdução de novas soluções na sua principal linha é muito bem vinda." (Filipe Teixeira, NewEsc.com)
02.10.2017 // PC Update
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NF-A20 FLX Review

Pour essayer de mettre en perspective l’intérêt d’un tel monstre, nous l’avons benché dans un PC assemblé dans le boîtier Prodigy avec une configuration de joueur, à savoir un i5-4670K et une GeForce GTX 780 Ti. Nous avons comparé ce Noctua A20 avec un ventilateur BitFenix Spectre Pro 200 mm ainsi qu’avec le 120 mm d’origine du boîtier et en limitant la rotation du 120 mm à 1000 tours pour rester silencieux (les 200 mm étant à fond, respectivement à 800 et 900 tpm). En mettant le PC en charge ludique (la démo du dernier 3Dmark en boucle), la température du CPU refroidi par un NH-U12S passe de 59° avec le 120 mm à 56° avec le 200 mm BitFenix et 55° avec le 200 mm Noctua et c’est surtout le GPU qui en profite réduisant de 85° à 76° et 72°. Sachant que le Noctua est en plus le plus inaudible des trois, on comprend que la qualité du célèbre fabricant autrichien est au rendez-vous.
Test verdict: "Noctua ne sort pas des produits aussi souvent qu’on aimerait, mais au moins, la qualité est toujours au rendez-vous. C’est encore valable cette fois avec trois séries de ventilateurs atypiques, mais les meilleures dans leurs domaines d’application. Le prix est certes premium, mais en adéquation avec les performances, le bundle et même la garantie de 6 ans incluse avec tous ces ventilateurs." (Thomas Olivaux, PC Update No. 90)
01.10.2017 // EnlaceHW.com
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NF-A20 FLX Review

Los ventiladores Noctua NF-A20 son el resultado de años de continua investigación y desarrollo de los ingenieros especializados de la marca. Indudablemente, la espera valió la pena, ya que no todos los días uno se encuentra con un ventilador de 200mm y mucho menos con el nivel de calidad que conocemos de Noctua. Los NF-A20 reúnen las dos características fundamentales de un excelente ventilador – una operación casi imperceptible y un rendimiento del flujo de aire digno de alabar. El único detalle que podría causar algunos problemas de compatibilidad debido a su grosor de 30mm. Algunos gabinetes que no cuentan con mucho espacio particularmente en la parte frontal podrían no ser compatibles con los ventiladores NF-A20. Actualmente, ambos modelos de la familia NF-A20 cuestan 540 pesos mexicanos antes de impuestos, lo que nos lleva a recomendar el modelo PWM sobre el modelo FLX, ya que el primero brinda un mayor control de la velocidad. Como ya es costumbre, Noctua respalda tu compra con una amplia y generosa garantía de seis años, donde los ventiladores seguramente vivirán más que cualquier otro componente de tu sistema. Si estás buscando un ventilador de 200mm, podemos decirte con seguridad que no hay ninguna opción en el mercado que se compare con los nuevos Noctua NF-A20.
Test verdict: "El ventilador Noctua NF-A20 es una excelente opción para el entusiasta que requiere de un ventilador de 200mm de alto rendimiento."
27.09.2017 // El Chapuzas Informático
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NF-A20 FLX Review

Noctua ha lanzado una nueva colección de productos de gama alta para el apartado de refrigeración que, como siempre, dejan a la marca en excelente lugar. Por un lado, tenemos los ventiladores Noctua NF-A12x15, una excelente alternativa para disipadores slim o chasis compactos donde no tengan cabida los tradicionales de 25 mm de grosor. Los NF-A20 son una opción para chasis que permitan los modelos de 200 mm, aunque no ofrecen una gran mejora frente a modelos de 120 mm. Mientras, los NF-A4x20 son un sustituto ideal para dispositivos ultracompactos, ya sea por reparación o para mejorar su sonoridad. Por si fuera poco, todos ellos ofrecen nada menos que 6 años de garantía, por lo que tenemos ventiladores para rato. Además, Noctua siempre busca suplir todas las necesidades de sus clientes y para ello lanza algunos accesorios como los que hemos visto, los se unen a un inmenso portafolio que podemos consultar aquí.
Test verdict: "Como no podía ser de otra forma, desde del El Chapuzas Informático le otorgamos el Galardón de Platino a los ventiladores Noctua NF-A12x15, NF-A4x20 y NF-A20 y los nuevos accesorios, productos todos ellos de la más alta calidad. En lo que respecta al precio, en el momento de la redacción no están listados en nuestro país." (Iván Martínez, El Chapuzas Informático)
27.09.2017 // JotaReviews.pt
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NF-A20 FLX Review

Todos os modelos apresentados têm em comum os rolamentos SSO2, que tantos prémios têm vindo a dar à Noctua, graças à sua excelente qualidade. Além de ter introduzido novas ventoinhas, a Noctua anunciou também o seu controlador de FANs, sendo ele o NA-FC1. Apresentou também novos kits anti-vibração, sendo eles o NA-SAV3 e NA-SAV4.
Test verdict: "Como aspetos positivos temos a dizer que resalta ao ouvido o ruído baixo que as ventoinhas reproduzem e a sua já falada qualidade de construção. Quanto ao controlador de ventoinhas, apesar de um pouco caro, acho muito interessante, pois este tipo de solução é muito boa para uma benchtable, pois está de fácil acesso, sendo este o seu ponto fraco, caso montem dentro de uma caixa terão de abrir a sua lateral para chegar até ele. Todos os outros acessórios, são todos eles de qualidade conhecida da Noctua." (João Teixeira, JotaReviews.pt)
27.09.2017 // ITNdaily.ru
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NF-A20 FLX Review

В этом году компания Noctua выпустила на рынок долгожданные (в основном для энтузиастов и любителей экзотических систем) вентиляторы в необычных форм-факторах. А именно 200 мм пропеллеры, компактные 120 мм модели и 40 мм вертушки. Теперь в линейке австрийского производителя есть варианты на любой вкус, а не только популярные модификации на 120, 140, 92 и 80 мм. В данном материале мы изучим шумовые характеристики и оценим мощность воздушного потока каждой новинки. Начнем с могучих двухсоток, а после познакомимся с маленькими, но крайне шустрыми 40 мм вертушками.
Test verdict: "Но пусть вас не смущают эти цифры, даже на максимальной скорости оба вентилятора функционируют практически бесшумно (в закрытом корпусе их не услышать), при этом воздушный поток формируется крайне мощный (можно и замерзнуть, есть находиться рядом с таким устройством)." (Евгений Никифоров, ITNdaily.ru)
21.09.2017 // TechUniverse.it
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NF-A20 FLX Review

La maggior parte degli utenti che sono alla ricerca di un elevato flusso d’aria a bassa rotazione per una ventola con il minimo della resa di suono, non può che scegliere una Noctua NF-A20 FLX o PWM. La sua velocità massima è di 800 RPM, ma con il suo cavo LNA, la velocità viene ridotta a 550 RPM ottenendo un livello sonoro di funzionamento della ventola quasi impercettibile. Noctua ha riversato tutta la sua conoscenza e la sua tecnologia in questa nuova serie di ventole NF. Ventole destinate ad appassionati di alta qualità e di finiture eccellenti. Abbiamo anche una bella aggiunta di accessori per ogni esigenza che troveremo nella sua scatola, come la due kit di montaggio antivibrazione. Se proprio dovrei trovare un difetto in queste ventole, direi che lo spessore di 30 millimetri è piuttosto alto. Ma sto veramente cercando il pelo nell’uovo anche se molti appassionati optano per spessori da 20 a 25 millimetri al massimo. Non posso che confermare che come al solito, la Nocta offre sul mercato un prodotto di altissima qualità offerto ad un prezzo davvero molto contenuto per tutto quello che ha da offrire. Teniamo anche conto che solo il corredo di accessori in dotazione è davvero di ottima qualità Se cercate una grande ventola per il vostro case ad elevata capacità, non posso far altro che consigliarvi una Noctua NF-A20 FLX.
Test verdict: "Ventola eccezionale davvero molto consigliata." (TechUniverse.it)
19.09.2017 // pcfoster.pl
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NF-A20 FLX Review

Wielu konkurentów nie daje wraz ze swoimi urządzeniami niezbędnych akcesoriów przez co jesteśmy narażeni na dodatkowe koszty. Tutaj ten problem nie występuje. Widać, że Noctua przez ponad 12 lat obecności na rynku wykonała wspaniałą pracę i udowodniła, że nawet najlepsze produkty można poprawić. Urządzenia z serii A wyróżniają się przede wszystkimi nowymi technologiami, niskim poziomem hałasu, wysokim przepływem powietrza i przede wszystkim świetnym wykonaniem. Modele A12x15 są ciche, solidne i mają tylko 15 mm grubości, za to A20 sprawdzą się w dużych obudowach, gdzie potrzebny jest duży przepływ powietrza. Małe modele A4x20 są przeznaczone głównie dla środowisk specjalistycznych, a dzięki adapterowi OmniJoin można je wszechstronnie wykorzystać.
Test verdict: "Powyższy artykuł powinien Was tylko utwierdzić w przekonaniu, że produkty austriackiej firmy są w rzeczywistości najwyższej jakości. Każdy z nich został świetnie zaprojektowany i dostarczany jest w bogatym zestawie." (Marcin Jankowski, pcfoster.pl)
18.09.2017 // PCElite.pl
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NF-A20 FLX Review

Ceny za każdy produkt tej firmy są wysokie jednak idzie za tymi cenami jakość wykonania, przemyślana konstrukcja, solidność. Te cechy maja odzwierciedlenie wszędzie, w każdym detalu, nawet w szczegółach związanych z opakowaniem, ze sposobem zaciśnięcia termokurczek. Jedynie do czego mogę się przyczepić to kolorystyka (jedni chwalą jak ja, drudzy ganią) oraz cena.
Test verdict: "Długo myślałem nad podsumowaniem jednak opiszę to krótko – Noctua to Noctua. Dobrze wydane pieniądze." (Arkadiusz Byś, PCElite.pl)

Installation Manual (PDF)

Information Sheet (PDF)

Can I run Noctua 3-pin fans on 4-pin PWM connectors and use my mainboard’s automatic fan controller?

You can simply connect our fan's 3-pin connector to the 4-pin PWM sockets of today's mainboards so that the fourth pin that transmits the PWM signal is left blank (due to the shape of the connector, there's no danger of reversing polarity). Some mainboards (e.g. current Gigabyte models) are capable of controlling fans not only via PWM, but also by adjusting the supplied voltage. In some cases, this may require you to change BIOS options like "Fan Control Mode" from "PWM" to "Voltage" or "Analog". Please consult your mainboard's manual in this regard. However, some mainboards use an "auto" setting by default that automatically chooses PWM or voltage based regulation according to the connected fan. Automatically controlling the fan speed may not possible on mainboards that pulse the power rather than lowering the fan voltage.

PWM PWM

Can I use Low-Noise Adaptors with y-cables / multiple fans?

Yes, Low-Noise Adaptors (L.N.A.s) can be used with y-cables, but please make sure to use one L.N.A. per fan and to place the L.N.A.s between the y-cable and the fans as shown below. Never use one L.N.A. for two (or more fans) by placing it between the mainboard and the y-cable!

D15S

Can I disassemble my fan for cleaning (or other purposes, e.g. painting)?

In order to ensure flawless operation over many years of usage, all Noctua fans come with a premium grade SSO bearing, which is fully sealed to prevent the entering of fine dust particles. Please note that the fan is not designed to be taken apart by the user. Removing the impeller from the frame will break the sealing of the bearing and results in a loss of warranty.

It is thus recommended to clean your fans using a duster, slightly moist tissue or canned air. Please be careful not to use too much force in order to prevent any damage to the fan. Please don’t use a vacuum cleaner as this may apply excessive force to the fan.

What pin configuration do Noctua 12V fans use?

All Noctua fans feature the standard pin-configurations set out in the Intel and AMD specifications. These standard pin-configurations are used on most mainboards and fan controllers today:

pin configuration

How should I clean my Noctua fan?

Fans inside computer cases tend to accumulate dust over longer periods of usage. In order to maintain maximum performance, please clean your fans regularly using a duster, slightly moist tissue or canned air. Please be careful not to use too much force in order to prevent any damage to the fan. Please do not use a vacuum cleaner as this may apply excessive force to the fan and do not put the fan under running water as water residues inside the motor may lead to short circuits.
In order to ensure flawless operation over many years of usage, Noctua’s premium grade SSO bearings are fully sealed to prevent the entering of fine dust particles. Please note that the fan is not designed to be taken apart by the user. Removing the impeller from the frame will break the sealing of the bearing and results in a loss of warranty.

Which Noctua fan or CPU cooler should I buy? How to choose the right model?

Not sure which Noctua product to buy? Our detailed buying guides for fans and CPU coolers help you to choose the model that works best for you.

Can Noctua fans be used to replace noisy stock fans in NAS devices?

Noctua fans such as the 40, 60, 80 or 92mm NF-A series models are ideal for replacing noisy stock fans in NAS devices in order to make them quieter and thousands of users have managed to significantly reduce the noise levels of their NAS units this way. However, while it is easy and straightforward to replace the fans in some cases, it can be very difficult in others, so Noctua strongly recommends that users carefully research if it is possible to easily replace the fan(s) of their NAS device before purchasing a Noctua fan for this purpose. Some of the common issues that can occur when replacing NAS fans are:

  • Different pin assignment: Whereas Noctua fans use the standardised pin assignment for PC fans (see this FAQ for details), some NAS units use different assignments. For example, some devices have the power and GND or rpm and PWM pins swapped. Therefore please carefully verify that your NAS device uses the same pin assignment as standard fans. Experienced users may also change the pin assignment by cutting and resoldering the fan cables, but please note that this will void your Noctua manufacturer’s warranty.
  • Different pin functions: Noctua fans use the standardised pin functions for PC fans (see this FAQ for details); however, some NAS units use fans where certain pins serve a different function. For example, some devices use the RPM pin for “power good” signals. Therefore please carefully verify that your NAS device uses the same pin functions.
  • Firmware speed control: Some NAS devices demand a certain maximum or minimum fan speed. If the new fan doesn’t have the same or similar maximum or minimum speed, the device may display errors or even shut down.
  • Different starting voltage: Most NAS devices use voltage-based speed control. If the new fan has a higher starting voltage than the original fan, it may not start up right away. This may lead the NAS device to display errors or even shut down because it suspects a fan failure.
  • Different power draw: Some NAS devices monitor the fan’s power draw. If the new fan has a lower power consumption than the stock fan, the device might display errors or even shut down.

Please note that most NAS manufacturers don’t provide detailed documentation regarding fan compatibility and control, so users who want to replace the fans of their devices usually have to rely on “How to” guides, blog and forum posts or video tutorials. For example, there are excellent video tutorials available for changing the fans in popular Synology NAS models (DS416j, DS1515+ and DS1812+ in English, DS416/DS415/DS916/DS216/DS214 and DS1515+ in German). Please also note that fan compatibility and control can vary from model to model and even from revision to revision even if the devices stem from the same manufacturer. As a result, it is important to make sure that the information or guidelines you rely on when replacing your NAS fan are applicable to your specific model as well as your specific hardware and firmware revision.

Due to the possible issues listed above, Noctua recommends that only experienced users attempt to replace their NAS fans. Please note that since there are so many different NAS models and most of them lack documentation for aspects such as fan compatibility and control, Noctua customer support cannot assist you with compatibility issues when replacing NAS fans. Please contact your NAS manufacturer for any questions regarding aspects such as the device’s pin alignment or fan monitoring and control.

Can I use Noctua fans in my system from Acer, Apple, Dell, HP, Lenovo or other major brands?

Noctua 12V fans comply with the established specifications for standard PC systems issued by Intel and AMD. Systems from Acer, Apple, Dell, HP, Lenovo or other major brands often deviate from these specifications e.g. by using proprietary fan headers, custom pin-alignments or pin-configurations, different methods of fan speed control, etc. This can lead to compatibility issues when using Noctua fans in systems from said brands. Some of these problems can be avoided with some technical knowledge, but especially BIOS related issues (e.g. errors or shutdowns due to low fan speed) can often not be resolved. As a result, Noctua does not officially support systems from Acer, Apple, Dell, HP, Lenovo or other major brands.

Can Noctua fans be used to replace noisy stock fans in switches, routers or other network devices?

Noctua fans such as the 40, 60, 80 or 92mm NF-A series models are ideal for replacing noisy stock fans in switches, routers and other network devices in order to make them quieter and thousands of users have managed to significantly reduce the noise levels of their units this way. However, while it is easy and straightforward to replace the fans in some cases, it can be very difficult in others, so Noctua strongly recommends that users carefully research if it is possible to easily replace the fan(s) of their network device before purchasing a Noctua fan for this purpose. Some of the common issues that can occur when replacing pre-installed fans are:

  • Different pin assignment: Whereas Noctua fans use the standardised pin assignment for PC fans (see this FAQ for details), some network devices use different assignments. For example, some devices have the power and GND or rpm and PWM pins swapped. Therefore please carefully verify that your device uses the same pin assignment as standard fans. Experienced users may also change the pin assignment by cutting and resoldering the fan cables, but please note that this will void your Noctua manufacturer’s warranty.
  • Different pin functions: Noctua fans use the standardised pin functions for PC fans (see this FAQ for details); however, some network devices use fans where certain pins serve a different function. For example, some devices use the RPM pin for “power good” signals. Therefore please carefully verify that your device uses the same pin functions.
  • Firmware speed control: Some network devices demand a certain maximum or minimum fan speed. If the new fan doesn’t have the same or similar maximum or minimum speed, the device may display errors or even shut down.
  • Different starting voltage: Most network devices use voltage-based speed control. If the new fan has a higher starting voltage than the original fan, it may not start up right away. This may lead the device to display errors or even shut down because it suspects a fan failure.
  • Different power draw: Some network devices monitor the fan’s power draw. If the new fan has a lower power consumption than the stock fan, the device might display errors or even shut down.

Please note that most network device manufacturers don’t provide detailed documentation regarding fan compatibility and control, so users who want to replace the fans of their devices usually have to rely on “How to” guides, blog and forum posts or video tutorials. Please also note that fan compatibility and control can vary from model to model and even from revision to revision even if the devices stem from the same manufacturer. As a result, it is important to make sure that the information or guidelines you rely on when replacing your fans are applicable to your specific model as well as your specific hardware and firmware revision.

Due to the possible issues listed above, Noctua recommends that only experienced users attempt to replace their pre-installed fans in network devices. Please note that since there are so many different devices and most of them lack documentation for aspects such as fan compatibility and control, Noctua customer support cannot assist you with compatibility issues when replacing pre-installed fans. Please contact your network device manufacturer for any questions regarding aspects such as the device’s pin alignment or fan monitoring and control.

Which cases does the NF-A20 fit?

Please refer to our case compatibility list for detailed compatibility information.

Do you have a question concerning one of our products? Please use this form to pose a question!