Just got a 8x4. Help w air flow.

I got a nice size room I tarped offhand the room n was using that6x9 ft area with a 600 and a 1k I got a 4x4 table and an ebb n and flow bucket system. 12 site. I also have another 3x3 flood table and a 12 light t5 for veg. I just got a used 8x4 ft tent!!! I plan to hand water in the 3x3 table to with the remainder of the pots I have that don't fit the flow system. Then move the 4x4 to the veg room. I'm going to move the res into the closet where the rooms outgoing vent is. I got two 400 cfm fan and one carbon filter. How should I set up the ventilation? Should I have a cooling fan and a scrubbing fan? Or just one fan to cool scrub at the same Time, which I have now. I have it in the flower room and it goes exaust port< 400 cfm fan< < light << light<<<carbon filter. Should I leave it all in the tent n do the same thing? Or should I do a can coolin and dumping into the closet, then the other can fan with a filte that then cleans the expelled air into the atticit? In which case would the air come from the outside of the tent to cool the lights or inside the tent? I got smell under control now because its in the room scrubbing and cooling but idfk how the heat dynamics will work in a smaller area and am close to 90 now!!