Thanks!, Iv been looking around and have a few plans, but it all costs money and if its not really needed then I wont bother- just have the internal fan and ionic air purifier. Is there anything that messures the quality of air in the grow space?, Im guessing the air needs to be vented for temps and also to supply fresh/clean air to the plant- would this just be the oxygen and co2 the plant needs?- so some sort of o2/co2 meter?, anyone use one?