We had our whole collection in an open closet in the hallway. Fans in each room on each end of the hallway, plus all the traffic back and forth by the closet you'd think would have been enough air circulation. Our T's started to become lethargic and not as active as they were before moving them into the closet. When we'd take them out for feeding they seemed to perk up, become more active. The GBB started rebuilding web tunnels. Put them back in the closet later that day and they're back to being lazy. Removed all the Ts from the closet into our respective rooms after that and they perked back up again. So even with air circulation in the hall itself, the shelves in the closet blocked the circulation from the spider enclosure. It's easy to test, take the enclosure out of the shelf unit for a couple days and see if it changes behavior at all. if not he should be fine in there.