Yup it keeps them cool Very well. They don't get Hot At all. Also with this I can always make the tower bigger for more USB hubs and more USB ASICs. The Reason why I am started with Block Eruptor Asic Miners is they are Cheap to get for now to get because I can't afford to much with cash, For most of the mining that I have done before I was stuck with CPU Mining and 1 GPU on my Gaming Rig.