Now i am doing an experiment with two S9, a fishbowl and some 3M Novec 649 liquid, this is an awsome (and expensive) test and i am excited... 
Now i am building an inox case, 14cm x 30cm x 28cm (last one is the heigth) to put the miner on bottom, the power supply just above and try and see... I will try to upload a vid and some pics if you wanna...
I am pretty sure if you put the USB hub and miners into NOVEC 649 you will erase the heat issue... it is about 150€, aprox. for about 6/8 USB miners, probably
Now i am building an inox case, 14cm x 30cm x 28cm (last one is the heigth) to put the miner on bottom, the power supply just above and try and see... I will try to upload a vid and some pics if you wanna...
I am pretty sure if you put the USB hub and miners into NOVEC 649 you will erase the heat issue... it is about 150€, aprox. for about 6/8 USB miners, probably