i have a hydro hut (52"*52"*75") an i have 1000hps with a vented hood. i have a 8" flange an a can fan8" sucking the heat out of the hood and throw it out the tent. have a carbon filter hooked 2 a 6" fan 4 the exhaust. the 8" hood fan also serves 2 purposes for sucking fresh air in with the other side 2 the hood is open an can suck air in threw the vents