Quote:
Originally Posted by SouthArk370Z
I think I remember reading about there being some kind of sealant/gasket material that could come loose and cause a knocking sound inside the ductwork. Not much to go on but maybe it will help narrow your search.
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Thank you for your help, SouthArk. I suppose I should have posted a link to this short video I shot when the issue first occurred. It does sound very much like a 'plastic on plastic' noise.
Anybody else have any thoughts on the problem?
https://www.youtube.com/watch?v=e2R315YoS1k