Be sure the vent portion that's into he duct is not so tall as to block air flow beyond it. On last 5th wheel the duct was about 1 1/2" tall into a 1 3/4" duct work, trimmed them down & used aluminum duct tape to seal the opening & duct work so it wasn't cooling the attic.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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