Exhaust off, I am going to use a Green Air controller for the CO2 and the exhaust fan. I will have 4 wall mounted oscillating fans to keep the air and C02 moving around hopefully. I do not know where I read the "4 hour air exchange method", Turtle, but I have hand written notes on it, so I know it is legit. Plus I have built my grow room inside of a room basically. It is 8x6x8 and if you farted in there, you could come back 3 days later and smell it. I overkilled it on airtightness (is that a word?). I used blue board, plastic (2 layers, plywood, T111, plus I insulated it all on the inside, all wired with its own panel box and receptables, yada yada yada. My day job is a mechanical engineer, so I am a dickhead when it comes to detail I guess. And, I only do shit the right way, which should work to my advantage in this hobby. I hope Zandor can offer some insight to us also.

peace bro,
b0nger

P.S. And I was not lying when I said I never grew before. This will be my first grow after I get my room/cabinet/palace done. I'll show y'all soon what it looks like. Ole lady has a camera, but all I can take pik's of is my thumb. I am photo challenged I think.......lol