Our 2018 3791RD built in September must have the new duct work. AC was working fine but pulled the grates and inspected and everything looked fine. I did go ahead and put pvc in them for good measure. We are full time and have been in the unit for 5 weeks now and have had zero problems of any kind. BTW this is our third Montana.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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