This is often said wrong.
I’ve asked three licensed engineers what causes this and not record any answer other that. Wow that weird.
Grey ductwork from the 1980s falls apart when exposed to sunlight. Usually the sun comes through the attic vents.
Home Inspectors come and join us!
http://www.atrei.org/atrei-officers.html The website has been updated.
A group of Professional Home Inspectors that get together every month for continuing education and comraderie.
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