hi kronz

i was in the same situation as u, ive got a grow tent 1 1/2 feet taller than yours and all i done was cut a 6 inch holee in the side of the grow tent and put a piece of 6 inch ductin through it,i also put a few bends in the ductin to stop the light comin through in the dark period cos light cant travel round corners for my intake of cold air and a 6 inch system air fan pulling the hot air from inside the grow tent.

this is just my 2 cents hope it helps