Looking to do a new indoor grow. I plan on having 8 1000w hps lights with either 6 or 8 inch vents. First question, should I go 6" ducting through the hoods or get 8" hoods and do 8" ducting for that many lights? I am planning on having the room completely sealed and doing co2. I will recirculate the air in the completely sealed room into a secondary room, where I will use charcoal burners to kill smell and dehumidifiers. I will then circulate that same air back into the grow room to conserve on the co2. (no fresh air, only recirculated "cleaned" air). So my question is how many inline/booster fans will I need to circulate in the ducting, and I was going to do a inline/booster fan just connecting from room to room, how much CFM will I need for this?