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I haven't read all the posts entirely, so if this is repetitive I apologize.
An enclosed area needs a place for air pressure to escape if there is no 'real' cold air return. Conceivably the furnace could pressurize the space and hamper the fan's ability to force air into the trailer.
I would think a 'flapper' on the stairs on the BACK side of the stair vent might work. Personally we always have a window or a vent open anyway.
Mark
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“Hard times create strong men, strong men create good times, good times create weak men, and weak men create hard times.”
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