Thread: Furnace noise
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Old 10-04-2008, 02:14 PM   #3
Jim Dickey
Montana Fan
 
Join Date: Jul 2007
Location: Port Orchard
Posts: 126
M.O.C. #7372
My Mountianeer does the same as bsmeaton, make banging noise as it cools. It sounds like the metal duct is expanding againsst a fixed point putting stress into duct (could be when heating or cooling) and as it changes (heats or cools) it flexes as the stress is invoked or released. We have learned to live with it.
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