The duct work in our 2011 North Country is weak. The fan on the AC unit blows a lot of air in the dump mode, but when the dump vents are closed the air coming through the ducts is almost undetectable. I like like the looks of that louvered adjustable vent in Jim's link. Shriver, did you try installing one? It looks like the vents in our '02 2502 Rockwood. That trailer had a great AC unit and the circulation through the ducts was terrific.