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Old 08-12-2018, 04:31 PM   #3
BamaRam
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Join Date: Apr 2018
Location: Divide
Posts: 267
I used the blue foam board and tape to block air from going further down the duct.

And I closed off the back air outlet at the unit so all of the cold air is routed through the duct.

Have you pulled the lower cover and plate to check the duct connections at the unit? Also need to check for return air mixing with cold air around the intake/outlet. I used foil tape correct several leaks in there.

There was also excess roofing membrane restrictiing return air flow.

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