I grow in a 2 x 4 x 6 foot tent. its very full. when the exhaust fan is running creating the negitive pressure we need to keep the stink in, it sucks the long side of my tent in making the tent less then 2 foot width. more like 20 inches width with the sides sucked in. i have hung a stick that is 27" long down from the tents upper poles so it holds the tent to a wider 27 inch width when the door is closed and the fan is running. so more room for the plants for the price of free.