I, like many, have found that the a.c. vent assemblies extended too far into the duct and also weren't sealed very well to the duct. About half of mine allowed cool air to escape into the attic area instead of out the vent. I cut down the part of the vent that is screwed to the ceiling, re-taped all, and ran a vacuum hose into each vent with the ac running.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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