Hello, I'm so glad I found this forum. I had completed the purchase of an Osburn 1600 wood stove (with a refundable deposit) to put in my basement in Quebec. I live in the basement and rent the upstairs, which has a wood stove insert using a separate flue. The installers came and looked at the flue. They were planning to insert a 6 inch flue because many tiles are cracked or broken. But they told me that it would be impossible because the opening was too small. They also informed me that they do not install 5" flues because they have far too many problems with the stoves smoking. Their only recommendation was that I seek out a mason. I have spoken to a mason. He is going to have a look but because it's an interior flue, it seems he won't be able to do anything to help. Anyways I'm on a tight budget (just bought my first house), and I couldn't afford to pay thousands for a mason on top of the current costs. Is it true that a 5" won't work? Could the tiles be removed to make room for the 6"? Am I just plain screwed? Thanks for reading.