The bigger issue now is that building code does not allow this any longer. We bought a villa with that same setup in an glassed in lanai and the inspector said that since there was not a return air duct in the room and it was an added duct it would not pass inspection. Luckily it was a sale by owner and cash. Make sure you know the code and what will be acceptable should you ever want to sell. I am handy enough that I would just take the duct out and close up the hole if it was an issue for a sale to go through.
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