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Why do the air ducts make a pounding noise after the heat shuts off
jalesn
Feb 24, 2010, 02:10 AM
What causes a banging noise in the ducts after the furnace shuts off and how can I fix this?
hvac1000
Feb 24, 2010, 04:22 AM
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.