let the air in from a vent on the roof where no light can escape, one vent for in, one vent for out. and you really only need one actual ventfan, I would suggest at least 250+CFM. I would put that ventfan to pull air from the room through the light and out to the top of the room. the other vent in the roof would have a 4" dryer hose attached to go to the bottom of the plants. (since heat rises.)

or I could just be really stoned.:stoned: just hooked up a 32"HDflatscreen to my PC. and likewoah.
JMORGAN Reviewed by JMORGAN on . Appreciate HELP with my setup please! I have a 4x4 area in a shed outside. I am going to get a 600w hps light. Does mh really make a difference for vegetative if I'm trying to keep costs down or will the one do fine with both stages? Also, there are 3 windows. Should I completely seal them? I'm trying to figure out the best thing to do for ventilation and co2 issues without purchasing a lot of extra equipment IF I don't have to. Won't be a problem to cut some vents if necessary. Also, would a 1000w be even better for this area or Rating: 5