i have a 36 inch wide portable closet its big and stands tall so i can grow a pretty large plant in here but i dont want it to be too big maybe 3 feet?... also, when flowering comes I know i have to buy a carbon filter to get rid of the smell but i am not sure how big the carbon filter should be for one plant :/ any advice on that?how big is your grow room. how big do you want it to get