Just a quick, non-technical note here. lol When you fill the end runs of the vents with foam, yes, the airflow out of the last vents increases pretty dramatically. The two last vents at the front of our RV are covered by the bunk when it's up against the ceiling. We closed them when the bunk is up. We recently had a need to use the bunk and when we put it down, we noticed quite a bit of airflow out of the vents even though they were closed, and the mattress was cold under those vents! We now leave those vents open, aimed out into the RV, and the bunk down about 4 inches from the ceiling instead of all the way up so that air flow is utilized. It has helped to drop the temp inside the coach about 2 degrees, which for us in our situation is HUGE.
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