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FWIW Paul, I see your point very well, and as an aircraft maintenance technician I feel I have a pretty good understanding of pressurized compartments.
I know the coach has lots of leaks but there are pressure changes based on windows, doors, etc open or closed.
One just has to run a Maxxair fan on speed 3 or 4 and open and close a window to hear a pitch change which is indicative of a pressure and flow change.
Personally, I can see the advantage to the air exchange you are concerned about.
I'm also sure the furnace will survive just fine with the "return air" blocked as well.
John
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2021 Airstream Bambi 19CB
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