I knew it was going to be warm in the GH so I set up what fans I had available 2 20 inch box fans,1 18 inch oscillating and and a home made one, I'm glad I did , the first pick is at 6 feet and the second at 2 feet I think the humidity is higher on the second one cause that pail has water in it lol, I also Lolly popped the manifolded plants ,I would like to get some high volume fans shaped like those window fans to hang at the very top I disconnected the end plastic from the top down and they would fit perfect