So, my under-house flex ducting system has failed. The previous designer used fiberglass board to make three plenum boxes (one at supply end of AC and the other two as splitters off the trunkline). As I reconstruct this mess (in a very tight and uncomfortable space), it occurs to me that the use of sheet metal T’s and Y’s could easily replace these plenum boxes. But, since I’m no expert, I’m wondering: Does the use of a plenum box and the associated expansion of the pressurized air help the system where a Y or T would not???
Jon Beer discusses air-sealing and insulation strategies at FHB House New York.
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