Incredibly silent and keep the system at low temperatures. They have excellent build quality.

Very good fan, indeed it is very quiet, you can barely hear it and it doesn't bother at all, and as soon as you see its packaging it looks like a quite premium product with a very nice design! It is worth its money and it's no coincidence that at the moment I ordered it, it was almost out of stock for a while!

They are EXTREMELY, EXTREMELY, EXTREMELY good. So quiet it's almost excessive, with a huge amount of airflow. How did they manage that?

Do you want a case fan, with very good cfm, silent, good construction? Just buy this! It does its job perfectly and quietly. It has been installed as a back exhaust fan. It is the best there is at a very low cost and quality.

Soft plastic, beautiful colors, good construction.
NF-S means it has low static pressure and fits in the chassis.
NF-P means it has high static pressure and fits in the CPU.
Low pressure = high flow and vice versa.

I put it in a Gammax 400 processor cooler,
the packaging says airflow 100 cfm, literally silent and my idle temperatures are -10 degrees

They were installed as front intake in a Be Quiet Pure Base 500, temperatures in the entire build dropped significantly, I honestly didn't expect it. The redux version only includes the screws and a 40 centimeter reinforced connection cable, whoever wants the extras will probably go for the full version. I didn't experience any vibration issues without the antivibration pads, maybe I'll order some in the future.

The product is exactly what one would expect from Noctua, meaning don't expect something visually appealing (because it's not), but rather something that gets the job done, and especially for its price, it is an exceptional fan for extracting air from the case. It is quiet even at 100% operation and placed in front of grilles...

As mentioned above, this particular product is not intended for a user who wants their computer case to have RGB LED, etc., as it has a very simple design, lacking in aesthetics, but with exceptional and perhaps the best performance one can find in a fan, especially for the money!

I recommend it for demanding gaming use, where high temperatures are encountered mainly in graphics cards, but also for machine learning PC builds where the system is used at 100% with high temperatures in all circuits. The fan will do its job exceptionally well, especially if there are three such fans inside the case pushing air out of it.

I have had it for 6 months and the PC has been breathing. For better cooling, put them in a front mesh case and you will be fine. The only negative is that they do not have antivibration pads, so if you don't want noise due to vibrations, you will need to get extra pads from the same company.

Perfect fans are very quiet and have great rotation speeds. Only Noctua fans are worth every euro.

I bought 4 fans at €12.25 each and I can only say the best things about them!
At this price, they are the best for case fans where we only need airflow! Of course, Noctua has even better models with static pressure in black color, but they cost twice as much!
Unfortunately, my case (Corsair 4000D Airflow) could only fit 3 fans in the front and 1 in the back because I have a large cooler (Noctua NH-D15S), otherwise I would have added more on top for exhaust.
They are so quiet that even at night when it's quiet, you can't hear the slightest noise (of course, I also combined them with black rubber pads because sometimes I had an annoying buzzing noise from the case).

Noctua, you are nothing else!
Of course, they are among the top (if not the best) case fans you can buy. In terms of performance, they are flawless, of course you can't even hear them when they are running, even at full load, and now they also come in a very nice color. Personally, I consider Noctua's classic brown-beige color to be very ugly and off-putting for many. They are very high-quality, even their cable is covered with fabric, not just plain ugly plastic. They are slightly pricey, but definitely worth their money.
If you install them with the Chromax Anti Vibration Pads to further reduce noise and any vibrations (which are sold separately), you are all set.
If you are looking for flashy RGB fans, then definitely don't go for Noctua. But if you don't care about that and want high-quality fans for your case, don't even think about it.

In full-tower 1 in front and 1 in rear exhaust (next to the processor and below the power supply intake). With the CPU at 42 C and the GPU at 65-70 C, they maintain the overall temperature at 45-48 C and operate at 50%...
A bit pricey, but high quality!