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Usually thumping in ducts happens when the fan inside them turns on or shuts off. It is usually square metal type ducts that suffer from this type of thing in my experience. There are also other sources of course such as something such as interior duct lining being loose and flapping about/Rodents/and the boogie man !!!!!!. (Sorry) couldn't help it. lol Hope this helps: Jimiwane
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∙ 16y ago
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