i have a 4x4 tent, im going to have a 600watt HPS w/ wing reflector. i had already ordered ventilation but it came in broken, i got a refund but i still have all the 4" ducting even tho i'm thinking i might need a 6" exhuast fan. i will have a carbon filter hooked up with it also. i read somewhere that i'd need an exhaust fan with at least 300cfm, but the most powerful (and affordable) 4" i've been able to find is only 260cfm. will this keep my tent cool? i want it no higher then 80F. the temperature of the room my tent is in is about 66F.