There are Corsair Ventis in it, I'd have to check the size, but they don't have RGB. They are all light grey and pleasantly quiet.

They are grey-black 140mm "cheap" Corsair case fans without RGB. The fans are supposed to be quiet, but they are so cheaply made that this is not necessarily true. Two of the three made unpleasant noises when they started up. They also don't have PWM.
I replaced all the case fans with high-quality BeQuiet Silentwing 3 PWM fans. 5 of them cost almost as much as the whole case but are absolutely recommendable. Absolutely quiet and the PWM support makes the fan curve wonderfully adjustable. They provide me with a perfect airflow.