I have a sound that is very similar to one drop of water hit inside my duct work. Now, it happens every 10 - 15 seconds while the fan blows. No, there is no water lines or waste lines near this duct work, and it is not water because it's been happening for months with no moisture of any kind in there. I have shimmed above the duct put rubber balls around it to stablize it and it still has the sound in there
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