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  1. Riversong | | #1

    No air circulation.

  2. GBA Editor
    Martin Holladay | | #2

    Larry,
    If you supply air to a room through a hot-air register, but you don't have a return-air path -- ideally a dedicated return-air grille and return-air duct from each room back to the furnace -- you end up pressurizing the room. That forces conditioned air into cracks in the ceiling and walls, leading to all kinds of problems.

    Read more here:
    "Return-Air Problems"

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