Another Air Conditioner Question

I taped mine up after switching out the 13.5 for th 15,000 BTU version. The biggest reason I did was because there were too many gaps letting the cold air suck back into the return and never reaching the duct work. It was just recirculating, already cold air. I used aluminum tape used for water heater and furnace flue's. The stuff will never come loose. And by the way, it made all the difference in the performance and cooling of the rest of the camper too.

I use a totally recyclable clasp that now devertor stays where I want it. Better known as a Clothes pin.