2022 update: Reduced fan count, no more top exhaust. Clean them every few months. They get predictably loud under full speed but holy moly they can move some air, which is why I bought them.

/update

Use the low noise adapter

Massive air flow with under 30db and it was $20. Yea, i'll take it. The only downside is its not PWM, but thats ok for me. I set this where there is no air flow restriction (top fan of the front of my case) and it has a straight shot to my CPU cooler. Very high end material and design for $20.

Quiet but moves a good amount of air. Happy to use for exhaust on my setup.

I think these fans may be quieter than my Noctua fans...

This fan moves air very quietly and nicely, I hardly hear it most of the time.

I used these as front intake case fans and they move plenty of fresh air and are very quiet.

This is my case’s sole exhaust fan, moves plenty of air and does it quietly. It feels sturdy and high quality, with metal fan blades and anti-vibration rubber pads on both sides.

Tons of airflow but a little noisy at full tilt. About what I expected for 118.2 CFM. I don't know of any fan pushing as much CFM at the same size. Plus no RGB so you don't even see them which is a plus.

These work great and seem to be of very high build quality. Plus they give you extra rubber corners so they fit in 120mm slots. Very quiet while still pushing a decent amount of air with the low voltage connectors on.