Yes I have both an intake and exhaust. The exhaust fan is a 8 inch circular desk fan, and doesnt go nearly as fast as I thought it would. So I am thinking it may get too hot in there without the exhaust. I took some pictures to show how my set up looks as far as where the plants are. The one is question is next to the intake fan, but obviously not being affected by the fan itself. However, it may be dead area as far as circulation goes. Also, the cabinet is light proof except at the top. Come flowering I need to figure out how to light proof the 8 inch exhaust fan area. I used weather stripping and duct tape to light proof the sides, but you can still see a small amount of light coming from the cabinet near the hinges. So the cabinet is only 99% airtight. I will pick up some molasses sometime soon and add that to my regular water. Hold tight for the cab pics.