Good, you will see I will make a culture in coconut, I'm a bit again on the issue and I have several questions about the ventilation of the room, I state my case to see what you think. I own a 3x3m room. and 2.7 m. height, and would put plants in 1x3m. and my question is would need a Intractor, I have air conditioning (only cools the air inside the room) and E2 125 RVK L1 fan, and a guy from Growshop told me the air that come under the door would be enough , I am not convinced at all, what do you think? Other than that, my "opposition" to the issue of Intractor is to get more temperature controlled with air conditioning, If I had it I think that the cold could go away faster and the air conditioning work constantly. I do not know how much CO2 consuming plants, but would need a Intractor for me? P.D. sorry my english, I'm learning Thanks and greetings!