I have had my stove installed for a couple days. I used UL approved foil tape on all the inside joints. It all seemed ok I had been using wood pellets. My stove is a multi fuel stove I have a bag of corn so I thought I would try some. Well corn makes a lot of smoke when it starts. Every joint I taped leaked where it went over the ridge on the pipe it connected to. I was very surprised I do reg furnace installs all the time and was very care full to make sure I pressed the tape down as good as I could using a tape install tool that I have. I peeled off all the tape I put on and put silicone seal on each joint. I use foil tape a lot to seal air leaks on duct systems and thought it was fine if you are going to use it find a way to do a smoke test. Mine did not leak a lot but i feel any leak is too much.