Put the fan/filter or just the fan, if your not using a filter, on the outside of the tent. Do those tents have any other intakes on them? If your running your cool tube in a closed way from intake to out with ducts from each and the light in the middle, you'll need another intake to get fresh air into the tent. I have 4 holes in my room; one one the bottom to get the fresh air in, one on top to get stale air out, and two for my cool tube. It's still running hot this summer, can't wait for the fall!