Hi,

I have ordered a couple of these cases and have installed Corsair H150i RGB PRO on the ceiling / roof rack . The fans included on the Corsair H150i RGB PRO were three Corsair ML120 PWM fans. So although I have not installed seperate fans, the dimentions of the rack should allow you to install up to three 120mm fans. The only tricky bit might be the length of the cable from the fan to the fan controller on the side panel of the case. I hope that this helps.