i have a 4x4 grow tent in a 5x4 closet, with 22 plants at the moment. as you can see in my pic thats a 4x4 grow tent in a 5x4 closet, it zips shut then i shut the closet door, my closet is also sound proof and i lined all 4 walls the floor and ceiling with eggcrate foam and the put on all 4 walls and ceiling Infored Bloc Myler. what i have learned your ventilation is everything when running a closet setup, it took me a while to get the heat under control, after a little trial and error its a great setup, good intake and good exuast and you are in bizz. you want to create a good negative pressure and it stays cool, i also run the AC outside of the closet at 77 to 78 degrees and it keeps the closet a degree or 2 warmer.