Posting this here for posterity.
Yes. I split the upper duct at the seam, though.
It was a pain getting all of the old foam and its backing material out, and getting the flaps covered, but a lot easier and more thorough than the other method that requires removal of the heater core and does not address the other flap.
Last edited by particlewave; 09-13-2017 at 10:01 PM.
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