i have a celing fan in my room that is on 24/7, the door close, but its not like its air tight you know, how ever cold it hot it is in my roon, that the temp of the bac, its wood, but the bac where that hole is like a hard cardboard, im planning on puttin a PC fan in that hole, then another one towards the top, im re doing it soon, but again, all my plants have never had a problem, i usually use tho whole thing, its like 6 feet tall, but i just dedicated that lil space, gonna move all the shit out of there again