Quick ventilation question..

I have one 442cfm inline fan pulling through 3 600w Hps and started having heating issues. Purchased a 180 duct booster fan today and was wondering where should I place it? On the one end where I'm bringing the fresh air in through the fans on right after inline fan so it helps pull the heat? Any help would be greatly appreciated!

tbh 180cfm booster won't really do much to help move air. You already bought it so i would say at the beginning of the ducting or after the first light.

What size do you think would be best my temps are about 86 right now

Should I get another one to put at the intake and stiil put one on the first light? Just want to keep lights cool first two are kinda cool but the third one is hot.

Thanks for the chart