heattt

hey so im just about done setting up my grow space, its a dresser hollowed out in the inside of course, its dimensions are 3 feet 7 inches tall 2 feet 5 inches wide and 1 foot 7 inches deep. i'm going to use about 200-300 watts of CFL's, i got mylar in the inside walls, and a 6 inch fan, and will be growing only one plant. i know its gonna get to hot in there but i don't want to have a noticeable ventilation system..whats a good way to keep the heat down and still keep this grow stealth?
thanks!