It should 'prolly be renamed non-duct tape...
It works OK on anything but actual duct work. Almost any kind of tape works better on ducts than that gray duct tape.
If you've happened to use it on ducting any time in the past - like, yesterday - you should check it 'cause odds are it ain't doing what you think it's doing...
Sealing HVAC Ducts: Use Anything But Duct Tape
