We have a Quadrafire isle royale we are looking to install in a fireplace remodel. The chimney is in good shape and has no liner. We plan on running the exhaust up the chimney to the chimney cap. Here’s the question. What do we need to have to make that happen? It’s 16’ up from the top of stove to the chimney cap. We need two angles to get the pipe centered to run up the chimney while the wood burner sits back in the fireplace. Do we use insulated stove pipe or chimney pipe. It requires 6” which will fit all the way up the chimney. Thank you!