Thanks for the info. I run that fan on my 5gh miner. Really quiet. But it's only  70cfm. I'll be returning those once they come in. Just ordered two more factory fans too put on the back.  You are exiting the hot air out the second  fan?  Wouldn't the hot air just rise if both fans were blowing in?  Just curious cause I'm about to do this setup like you have. Also if i overclock both can I run one 1200 watt PSU for both miners.