Goose, you did use aluminum duct tape to seal inner vent ring to the duct so that you are not losing air into the attic? Mine weren't taped very well at all. If you have, then you are on the road to better flow.
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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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