10k CFM seems pretty overkill to me. Im running a single exhaust fan: https://www.amazon.com/gp/product/B002TXL5P0/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1

1.6k CFM for ~ 15kw worth of miners. Temps are about 10 degrees above outside.
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Agreed. I'm running roughly the same but using a single exhaust fan with a max of 3560 CFM. http://www.airkinglimited.com/page/window-fan.html

It's doing a great job so far. Will prob have to add a second soon as I add more miners.