Hey
Thanks for the reply, cool so 6 would work theoretically. I am using a table fan to cool down the hub's power supply, raspberry Pi, and block erupters. Would I be able to swap a 5amp power supply in and run 10 on 1 hub? Also I have a fear my table fan will stop working for some reason if I leave it running for days/weeks, should I be concerned?
No: you can't replace the 3A power suply with a 5A power supply: either you'll fry the USB hub or the internal circuit will limit the current properly and the eruptors will start spitting out hardware errors.
Yes: you can daisy chain a shit-load of USB-hubs untill you reach the maximum of 127 devices.
No: I wouldn't worry too much about the fan. I have a few block eruptors which work 24/7 without cooling and they're still doing fine. Having 5 devices on 3A power USB hub also aids in keeping things 'safe'. If it stops, it won't damage your hardware (unless it catches fire, but those things should be tested for that
)