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Completely plug a duct that is never used but can't be removed?

2K views 5 replies 4 participants last post by  skiposwald 
#1 ·
There is much more to this story, but I'll make it simple.
I have a 4" duct that I can't remove, but I would like to completely plug it. Sticking a small towel in there has worked perfectly, but I worry about safety or insurance issues. Any recommendations for something I can stick in there to quickly and safely plug it? Or maybe some sort of expanding foam? I am open to anything but unfortunately it is a tight area to work in. I have googled like crazy, but all I get is info about that goop you put outside your ducts to seal them.
 
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