Current air flow is as follows:

I have the previously mentioned 8 in duct booster pulling cold outside air into my setup.

I grow vertically hydroponically, utilizing a vertitube. My vertitubes hot air is being pulled out by a Vortex 6 in. fan through a closed loop.

I also have a 6 in. Vortex fan on my charcoal filter exhausting.

nighttime temp is steady 74. Higher than normal because of my day temp being so high. Compensating for temp change, preventing mold? At least thats my thinking. Its definitely cutting down on condensation buildup after daytime.