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🌪️ Small fan, big chill — keep your gear cool without the noise!
The Noctua NF-A4x20 FLX is a premium 40mm computer case fan engineered for high-performance cooling in compact spaces. Delivering up to 9.4 m³/h airflow at speeds up to 4400 RPM, it features advanced acoustic optimization for ultra-quiet operation at just 14.9 dB. Ideal for 1U servers, routers, NAS devices, and more, it comes with a full accessory kit including anti-vibration mounts and an Omnijoin adapter for easy installation. Trusted by professionals, this fan combines award-winning design with reliable, silent cooling.
| Air Flow Capacity | 9.4 Cubic Meters Per Hour |
| Asin | B072JK9GX6 |
| Best Sellers Rank | #40,720 in Computers (See Top 100 in Computers) #330 in Computer Case Fans |
| Brand Name | Noctua |
| Compatible Devices | Desktop, Server, Router, Switch |
| Cooling Method | Air |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,368) 4.8 out of 5 stars |
| Item Dimensions L X W X H | 40L x 40W x 20H millimeters |
| Manufacturer | Noctua |
| Material Type | Plastic |
| Maximum Rotational Speed | 4400 RPM |
| Model | NF-A4x20 FLX |
| Noise Level | 14.9 Decibels |
| Number Of Items | 1 |
| Part Number | NF-A4x20 FLX |
| Power Connector Type | 3-Pin |
| Unit Count | 1 Count |
| Upc | 841500110116 |
| Voltage | 12 Volts |
W**S
Nice cooler for sff aystem
Its nice for the small pc
P**W
Silence
After replacement in switch, it became silent
W**B
High quality
Very good performance and quiet. I'm using it on 3D printer to cool E3D V6 hotend.
A**L
Super silent
Super silent, buy it
A**R
Not loud at all. Wonderful.
I used this to replace the fan in my hub. Keeps things cool.
C**N
Quiet; must have for a USG pro in your home!
I have fitted these, blowing, into my Ubiquiti UniFi USG-Pro-4 and I can report the high pitch whine is now gone. Pretty handy when you don't have a rack out of the way of habitual areas! Only been installed an hour but so far so good, and I chose to use the noise suppression mounts, they aren't recommended for this application but I wanted to try it and the resonance from the metal cover is now much more subtle. Running these fans without a cover show they are actually virtually silent, but obviously, it's not recommended to run this device with the cover off (airflow etc)!
R**S
Very quiet fan
Fan was so quiet I had to visually check to make sure it was spinning. It comes with both a low noise adapter and an ultra low noise adapter. I can't imagine needing them since it is barely audible at full speed. Certainly the quietest fan this size that I've ever encountered.
F**Z
Excelente ventilador
Desde el empaquetado del producto se siente la calidad, viene con todos sus accesorios, se siente de muy buena calidad. Es silencioso y tiene buen caudal de aire. Lo usé para reemplazar el ventilador de un XVR Dahua, el ventilador original es de 2 pines, este ventilador noctua viene con sus accesorios para poder hacerlo de 3 pines a 2 pines. Los resultados fueron demasiado superiores al ventilador original, mucho más caudal de aire y sobre todo muy silencioso. Estoy muy satisfecho con la compra.
Trustpilot
5 days ago
1 week ago