You're concept of cooling is flawed. It is not efficient to try to "cool" the miners. What you have to deal with is getting rid of the waste heat. Two fundamentally different principals.
Also, please describe your "rigs", it looks like you're talking about GPU and this is the Bitcoin mining forum which means ASICs.
right, sorry. It's a 6 gpu rig with open air frame. I have 1060s to 1080ti in there. A rig runs around 800-900kW.