I use this to tape up cardboard to recycle. Also use it to tape up all kinds of garbage. It is great for that purpose at a great price. If you are planning on actually taping the duct work in your home, for heat or air conditioning, I would NOT use this. It doesn't last long for those applications. For that, I use the expensive stuff that is MUCH thicker. For my purposes, this does the job at a great price.