Why are my air ducts popping and banging?

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Popping and banging sounds are caused by the movement of duct walls due to pressure changes. Hot air makes your ductwork expand; cold air makes it contract. How much popping noise you hear depends on 1 or more of these 4 factors: The shape of your ducts. Your ducts’ gauge rating. The size of your ductwork. Furnace noise.

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