AC Duct

went in the attic during an inspection and saw the duct work that was sealed with tar? Also, the outside of the duct broke apart by touch and was covered by brown powder. Please let me know your thoughts.

Old, poor condition, possible homeowner repair, recommend licensed HVAC person evaluate and repair/replace.

Simple well said. I agree

It’s in poor condition but that’s standard 1960s Florida duct install