Quote:
Originally Posted by dpg
Ducts are not wrapped ...
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I have an old house and I've seen it in new buildings too. It prevents air from leaking past the joints in places you might not want drafts. That's why they invented duct tape. It will also keep fumes out of the system if your ducts pass though a work shop or garage.
This is probably not a critical need. Tape probably adds a slight bit of stiffness at the joint but the hangars can probably do that job, alone.
Definitely get the job done before it gets cold. Good luck!