We don't have a 3800, but our 3585SA (2012) has 6 vents between the living room (4) and kitchen (2). I had previously done this mod on our 2008 3400RL and it helped very much. When I started to do our current unit I found that they did not protrude into the duct at all. I only examined 2 of them...maybe I should have done them all.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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