Hey guys I was just wondering if anyone has done this before. I've had the same grow going for over a year now and I feel I have it pretty much dialed at this point. I am running 1500ppm suplimental co2 in my grow room. I have managed to get my exhausts down to 3 times a day thanks to the use of a dehumidifier and closed circuit air cooled lights. The thing is tho as my exhaust periods have decreased I've found that more odor seems to be escaping, as my only odor defense is a carbon filter in conjunction with my exhaust fan I figured its due to to air being cleaned less often. I was thinking about running a 4" centrif fan with carbon filter hangin from centre of my ceiling (this will run 24/7). I wouldn't have any ducting on the filter or fan as really I just want to clean the skunky smelling air in my growroom before it has a chance to escape. I also think this would help with air circulation. My query is ..... And this might sound stupid buttt...... Will the carbon filter depleat the co2 level in the room. Are odors bigger than co2? I'd imagine they're millions of times bigger but will a carbon filter allow 1500ppm air to flow through it without depletion? And if not does anyone have any ideas? Apart from sealing the room as I have it as air tight as its ever gonna get with the materials I have to hand. Maybe the same idea with a o3 gen? Thanks in advance for any answers you guys post. Cheeeeeeers dudes !