Cartoonface12 :
The fans are Aerocool Silent Master 200R 76.0 CFM 200mm
These fans are rated at 18 dBA level. Best you can get.
Their rated speed is 800 +/- 200 RPM.
It is massive 200mm fan.
For a 200mm fan, I was expecting a more CFM. But given the circumstances of lowest noise level, adjustable speed and still a good value on CFM, this is a very good choice.