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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.
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 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
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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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)
11.09.2017 // Tecnogeekies.com
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NF-A20 FLX Review

Hoy hemos presenciado como Noctua lo ha vuelto a hacer, las prestaciones de sus nuevos productos continúan siendo la referencia que siempre han sido, pero hay otras cosas que también van a continuar. Frente a las grandes prestaciones tradicionales de Noctua hay otro aspecto que también se mantiene, este nivel de calidad no es barato, desde los 30€ que cuesta el ventilador de 200mm, el NF-A20. El adaptador SATA por 8€, el controlador por 20€ o los sorprendentes 15€ que cuesta el pequeño ventilador de 40mm, pasando por los más razonables 20€ por el ventilador más tradicional de 120mm. No obstante hemos de hacer hincapié en algo que solemos decir en Tecnogeekies bastante a menudo, aunque 20€ pueden parecer muchos, especialmente solo por un ventilador, su calidad y su durabilidad nos hacen recomendar esta marca siempre que vuestro presupuesto os lo permita.
Test verdict: "La calidad tiene un precio, pero en casos como el de Noctua merece la pena." (Ignacio Merino, Tecnogeekies.com)
10.09.2017 // CoolingTechnique.com
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NF-A20 FLX Review

+ Ottima qualità costruttiva
+ Materiali di primordine
+ Ampia dotazione di accessori
+ bassissimi consumi
+ Motore basato su cuscinetto SSO2
+ Vibrazioni ridotte al minimo sindacale
+ Coperchio di rinforzo per diminuzione vibrazioni
+ Masse sospese ottimizzate (NF-A20)
+ ottimo rapporto CFM/RPM e CFM/Db(A)(NF-A12x15)
+ Tecnologicamente avanzate sia sul piano elettrico che fluidodinamico (vedesi articolo)
Test verdict: "I prezzi sono quelli di sempre ovvero alti in pieno stile Noctua, la qualità si paga ed al solito il brand austriaco non fa sconti a nessuno; le A20 arrivano all'importante cifra di 29.90€ cad. e su questa cifra di 200mm ne trovate davvero tante anche a metà prezzo e con emissioni acustiche similari poichè le ventole appartenenti a questa categoria sono tutte a bassi RPM, certo non avrete l'SSO2, l'AAO frame e tante piccole chicche ma si può risparmiare facilmente qualche decina di euro, ovvio non saranno delle Noctua!" (Damiano Villa, CoolingTechnique.com)
30.08.2017 // Conseil Config
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NF-A20 FLX Review

En ce qui concerne le niveau sonore la marque a bien travaillé, les NF-A4 se démarquent de ce que l'on trouve habituellement avec une discrétion très apréciable, les NF-A12 quant à eux sont très silencieux au minimum mais plutôt bruyant une fois alimentés en 12V, rien de bien grave cela dit vu les adaptateurs livrés. Les plus gros NF-A20 sont également silencieux que ce soit au minimum ou au maximum. Proposés à un tarif allant de 7.90€ pour les NF-A4 à 29.90€ pour les NF-A20 en passant par 19.90€ pour les NF-A12x15 ils sont encore une fois réservés à ceux qui ne se satisfont que de produits haut de gamme, ils ne seront clairement pas déçus.
Test verdict: "Chez Noctua le maitre mot est qualité, et encore une fois cela se voit sur les derniers ventilateurs de la marque." (Christian Marchini, Conseil Config)
21.08.2017 // OCKD.es
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NF-A20 FLX Review

Los nuevos Noctua NF-A20 pueden conseguirse tanto en su versión PWM o FLX por 31,50€ en tiendas como Alternate, siendo un precio similar a otras opciones del mercado de alta calidad que proponen soluciones de gran rendimiento y funcionamiento silencioso. Obviamente, con los ventiladores de 200mm la mayoría de usuarios buscan un gran flujo de aire a baja rotación del ventilador para obtener una sonoridad mínima, con los nuevos NF-A20 tanto con su velocidad máxima de 800 RPM, como con su cable adaptador Low Noise que la reduce hasta las 550 RPM consigue sonoridades muy reducidas, casi inaudibles en el caso del adaptador Low Noise. Noctua ha vertido todo su conocimiento y tecnología del resto de la serie NF en estos nuevos ventiladores, y el resultado no es otro que unos ventiladores de gran calidad y excelente acabado, que cuentan con un buen añadido de accesorios para cualquier necesidad como pueden ser los dos kits de montaje anti-vibración.
Test verdict: "En conclusión, le entregamos nuestro galardón OCKD ORO a ambos ventiladores NF-A20 tanto en su versión FLX como en la PWM, sin duda dentro de los ventiladores 200mm una de las opciones de mayor calidad y mejor sonoridad que podemos encontrar." (Eloy Puigcerver, OCKD.es)
17.08.2017 // APHNetworks.com
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NF-A20 FLX Review

Noctua is well known for being quiet, but also have good performance. They have definitely stayed true to their reputation. The Noctua NF-A series have exceptional build quality through and through. All of the fans performed well during the tests. On top of that, they were also quiet, especially if run at nominal speeds instead of their maximum.
Test verdict: "The Noctua NF-A Series is a comprehensive line up of fans that will be great addition to many system environments." (Ben Joubert, APHNetworks.com)
10.08.2017 // WhatNext.pl
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NF-A20 FLX Review

Wszystkie wentylatory oraz akcesoria są godne polecenia. Noctua ponownie pokazuje, że umie zrobić świetne konstrukcje. Śmigła są wydajne i prezentują się dobrze pod względem kultury pracy. Także jakość wykonania stoi na najwyższym poziomie. Podobnie jest z akcesoriami – świetne wykonanie i odpowiednie działanie.
Test verdict: "W zakupie sprzętu przeszkadzać może jedynie cena, która jest spora. Jednakże znakomite produkty nie mogą być tanie bo było by zbyt pięknie." (Michał Andruszkiewicz, WhatNext.pl)
18.07.2017 // GreenTechReviews.ru
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NF-A20 FLX Review

По результатам тестирования мы можем с уверенностью сказать, что обе 200 мм модели, возможно, и не обладают явным преимуществом перед парами привычных вентиляторов, но они обладают экстремально низким уровнем шума, чего нельзя сказать о соперниках. По сути, NF-A20 FLX и NF-A20 PWM невозможно услышать, даже если отключить все остальные вентиляторы в корпусе. Да что там в корпусе – если взять какой-либо из них в руку в рабочем состоянии, то даже так он кажется бесшумным!
Test verdict: "Вентиляторы Noctua NF-A20 FLX и NF-A20 PWM, обладающие непривычными размерами 200х30 мм, предлагают пользователю очень высокую эффективность вне зависимости от режима работы, сохраняя, при этом, чрезвычайно низкий уровень шума. Обе модели способны заметно снизить температуру в корпусе, что влечёт за собой и снижение температуры комплектующих. Если у вас появилась проблема выбора 200 мм вентилятора, но NF-A20 FLX или NF-A20 PWM станут бескомпромиссным решением для вашей системы!" Владимир Солонин, GreenTechReviews.ru)
12.07.2017 // FunkyKit.com
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NF-A20 FLX Review

We have no doubt about the top quality of Noctua products. Each one of them is well designed. Even the package is exceptional. Most manufacturers are missing these little things that count while Noctua provides package with everything you may need for installation. Long years of designing and engeneering gave great results. Where you could think there can’t be done much more, Noctua proved that even the best products can be improved. New A series fans are the best in their class and it’s hard to find anything similar on the market. Even though new fans are considered as “slim”, they provide top air pressure while keeping low level of generated noise. Perfect balance for all who expect the best from their fans.
Test verdict: "We are recommending all new Noctua products without any hesitation!" (Bartosz Waluk, FunkyKit.com)

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

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.

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.

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 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 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

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.

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