There's hardly any heat even after hours of operation. The fan at the bottom is still running very quietly. Sometimes I feel the fan isn't necessary but since it's so quiet it didn't bother me. Perhaps have a switch to switch it on or off, Tomas? Like if I needed to cool myself, I just switch it on.
I haven't shipped an amp with a fan for almost a year! You can disconnect it if you want Just make sure the connections doesn't short to something on the inside.
My Citadel didn't have a fan and after running for 4hrs it was just slightly warm to the touch, literally.