Review on case fan be quiet! Pure Wings 2 140mm PWM, black by Micha Ambroziak ᠌

I bought 4 of these valves for installation in the Fractal Design Define R5 case (2 propellers were already there). So in total there are 6 valves in the case (3 for blowing in and 3 for blowing out). Connected to the motherboard ASUS ROG CROSSHAIR VII HERO via 4pin connectors, allowing you to control the fan speed through the BIOS. The wire is long enough to connect to the motherboard without any problems. The maximum fan speed is 1000 rpm and at this speed they are absolutely inaudible. I note that in my case the front wall is covered by a lid, so that air is taken from narrow slots on the sides. The rotation speed in normal mode is approximately 780-850 rpm, rarely rises to 960. I am satisfied with the purchase, I advise everyone to these propellers - silence and effective cooling are guaranteed! In 2022, I took them in the online trade for 815 apiece. Now the price there is already 1150, i. E. increased by 41%. But on the Market it's 1270, so what can I say.