Noctua NF-A9 PWM, Premium Quiet Fan, 4-Pin (92mm, Brown)

Bought this to replace the broken stock fan in my UGREEN NAS DXP2800 and it ended up being a perfect drop‑in upgrade. Noise level: At typical NAS fan curves it’s basically whisper quiet, even sitting on a desk a few feet away. Cooling: Despite the low noise, it moves enough air that my drive and system temps stayed the same or slightly improved compared to the original fan. Cable length: The included cable is long enough to route cleanly inside the NAS without needing an extension or weird bends. Mountability: Standard 92mm mounting holes lined right up; swap took a few minutes with just a screwdriver and no mods needed. Speed and airflow: PWM control works as expected, ramps smoothly under load, and at higher RPMs you get noticeably stronger airflow without a huge jump in noise. Overall, if you’re looking for a reliable, quiet replacement fan for a small NAS or SFF build, this one is worth paying a bit extra for.

The Noctua NF-A9 PWM (92mm, 4-pin) is one of those components that quietly justifies its premium price — literally and figuratively.I've used several Noctua fans over the years, and this 92mm PWM model continues the brand's reputation for exceptional build quality and acoustic performance. At max 2000 RPM it pushes a solid amount of air (around 78.9 m³/h), yet the noise tops out at just 22.8 dB(A) — in practice, it's barely audible even in a near-silent room unless you put your ear right next to the case. With the included Low-Noise Adaptor plugged in, it becomes whisper-quiet while still providing perfectly adequate cooling for most 92mm applications.What stands out:The PWM control is smooth and responsive; the fan ramps up/down almost imperceptibly as temps change. Flow Acceleration Channels and the AAO (Advanced Acoustic Optimisation) frame genuinely reduce turbulence noise compared to generic fans. Comes with a generous accessory kit: anti-vibration mounts (the classic brown grommets), extension cable, Y-splitter for daisy-chaining two fans on one header, screws, and the LNA adaptor. Build feels rock-solid — fibre-glass reinforced PBT blades, SSO2 bearing, and Noctua's legendary >150,000-hour MTTF rating give real confidence it'll outlast most other PC parts.

This thing is amazing, and it comes with different connectors: Y-connector, an extension, and a quiet connector. This fan is quiet, doesn't rattle on the case due to its rubber padded corners, and it performs well. Very good quality fan.

I have a ASUS ROG Strix GL10DH. The fan was failing and very loud. The Noctua NF-A9 PWM went in with 4 screws and pluged into the motherboard with no issues. It's really quiet and is pushing a good volumn of air through the tower case. I am pleased with this purchase and feel it was a good value for the price.

Got an inverter charger and it has a stupid loud fan and this saved the ears in my office . Silence and serenity ! I even used two fans instead of the oem one jet ! And still whisper quiet .

Since I bought a processor cooler from the very same company, I saw this fan in particular. I wanted to replace my loud stock cooler fan. It was a struggle at first, trying to install the "silicon" screws provided in the packaging, but they didn't work on my computer, which was unfortunate but not a big deal. I ended up having to use the other packaged screws, which actually turned out to be "self-tapping screws". They're not your typical screws, so the point for them is to create its own threads onto the fan's screw holes. The fan does not have its own threads out of the box, so once you screw onto the fan's holes, the "self-tapping screws" cuts into the soft plastic. I thought this was not right, but it turned out to be completely normal based on a quick online search, which made me feel good now. The fan also comes with several extension cables. Overall, after plugging the fan in, it worked like a charm. And it is reasonably much more quieter than my stock computer fan. For a good budget fan that was inexpensive (under $20), I say it was worth it.

I bought this Noctua fan to replace the stock fan in my UGREEN NAS, and it’s a huge improvement. The installation was easy, and the difference in noise is night and day—now it runs much quieter. Cooling performance is great too, keeping my drives at a safe temperature. If you want a reliable, silent upgrade for your NAS, this fan is definitely worth it.

Great case fan with long service life. Extremely quiet as well. Highly recommend.

Fonctionne très bien, très silencieux et très simplement monté !

Ennesima ventola Noctua a casa mia. Che dire usata con il cavo che diminuisce la velocità, collegata con il cavo ad Y per la pwm del radiatore noctua del processore. Due ventole, una epr il radiaotre processore a piena velocità ed una per estrazione aria. !0 e lode e rumore zero. Abbassamento temperature del case fantastiche e senza rumore. Ho solo noctua in casa su 4 workstation e fra radiatori ed estrazione di vario genere nelle varie configurazioni non posso che consigliarle.

I used these for my 6800pro Ugreen NAS. They fit perfectly and the airflow is increased but the noise is much reduced allowing me to leave it set on default. As you would expect these fans came with loads of adapters etc and were well packed. they were sturdy and the rubber corners helped with my metal chassis. The performancce of Noctua is always great and to me the the little bit more thay cos is worth it.

Inderdaad zeer stille ventilatoren, minstens zo goed als de eveneens kwalitatief goede E.M. Pabst fans van Duitse makelij. Voldoende luchtverplaatsing om je pc van binnen mee te koelen als je een paar in de pc kast zet. In de verpakking zaten nota bene nog extra aansluitkabels met ingebouwde potmeters om de snelheid van de fan mee te kunnen reguleren.

I bought a few Noctua NF‑A9 PWM fans to replace the standard units in my NAS enclosure, and the improvements are noticeable from the moment they start spinning. The stock fans were noticeably loud, especially in a quiet room, but these Noctuas immediately brought the noise level down to something barely audible. For a device that runs 24/7 in a living space, that alone makes them worth it. Cooling performance is actually better than with the original fans. Temperatures dropped a few degrees under load, and the PWM control keeps everything smooth and stable without sudden ramp‑ups. Installation was straightforward, and the build quality is exactly what you expect from Noctua: solid, reliable, and engineered with care. If you want to keep your NAS (or any small enclosure) as quiet as possible without sacrificing cooling, this is an excellent upgrade. Highly recommended.