Thanks. I'm under a 400hps, grow box can handle one more plant when they grow more evenly. Got an exhaust fan that circulates air a mile a minute, pushes air thru a carbon scrubber I built. No odor thus far, hopefully it works thruout the grow since this is the first time using it. I also have a fan that vents heat from the hood. First time under a 400 also, been going under a 250mh so these should end up much bigger, not that a 250 wasn't doing the job.