Well the box is finally complete the heat these rigs were creating was bad in my house I run 4 main gtx 6 gtx 1070 rigs with an overclock of 649 memory 0 core clock at 70-75% max power. All fan speeds are set at 90% inside this box. My basement used to get to 80-83* F when the A/C would never shut off and it was uncomfortable inside the house upstairs as well. I got some plexyglasss had a 6 inch hole cut in it and am running a 400+ CFM inline fan inside it. So far the inside box after 3 hours (just checked) said 109 Degrees F. This box also has 16x26 inch filters on each side of it. My GPU temps still seem in the 60* C mark some are in the low 70's atm. I was thinking bout adding another T connector and adding in another 400+ CFM fan with another 6 inch outlet. Outside it blows hot air pretty good atm. Give me some suggestions this was to lower my power consumption with all the Air conditioning I was using its now finally comfortable not sure if this temp will continue to rise inside the box or not. Here are the pics......

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Or setup a bunch of liquid nitrogen cooled pipes running through your box that the air flow would pass over. Or even just hook a duct directly into your AC unit.
Or just do like everyone else says and put a bigger fan in. But my ideas would look way cooler and cost a ton more to do.
I was told fan life at 90% (manual override) is about 100,000 hours so thats why I bumped up the fans to 90%... I didn't like GPU temps at auto msi afterburner settings....