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-   -   Why do the air ducts make a pounding noise after the heat shuts off (https://www.askmehelpdesk.com/showthread.php?t=451030)

  • Feb 24, 2010, 02:10 AM
    jalesn
    Why do the air ducts make a pounding noise after the heat shuts off
    What causes a banging noise in the ducts after the furnace shuts off and how can I fix this?
  • Feb 24, 2010, 04:22 AM
    hvac1000
    The sheet metal is under stress from expansion and contraction. Usually a cross break is put in the sheet metal to help stop the noise.

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