I have about 12 ASICs going in my garage and thought I had enough ventilation to expand to ~20 but am struggling to maintain temperatures.

Outside: 70 F
Inside: 85-90 F

Fans:
2 x Window fan @ 3500 CFM
1 x drum fan @ 17000 CFM
1 Pedestal fan @ 3000 CFM

I've tried various combinations.. It works pretty well with garage wide open and window fans on high -- but that isn't very secure... I've tried cracking garage door but don't get enough airflow...

I didn't want to have flex duct running all over the place either and metal duct wouldn't care away enough heat (i.e. 22" duct is at most 2000 CFM?)

Could use help on what the most efficient way to ventilate the space to outside is... It never gets above 90 F outside-- usually 50-70 F

Pictures:

https://imgur.com/a/ScgVr