Why air return in a home?
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What problems could result without air return?
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No air circulation.
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"