you need a stronger fan, get an inline duct fan from home depot at least the 6 inch 250cfm. You will need a taller box as well, I made the same mistake. My box is 3x3 and 4 feet tall and I still feel it isn't tall enough. Your pots will take up 12 inches and your light will take up the top 10 or twelve inches. and then your left with only 12 inches of usable space.