I'm replacing my wood burning fireplace insert with a used Whitfield Profile 30. My 25' chimney is already fully lined with a 6" ss liner and I was considering doing the install myself, since I thought it would be a simple matter of getting the necessary connections (cleanout T, flex pipe and adapter) and hooking them up. However, I thought I would check the cost to have it done professionally, and when I asked an installer for a quote I got an unpleasant surprise. He told me that the installer who previously installed my wood insert should not have removed the firebrick from the fireplace, and it will have to be replaced before my pellet insert can be installed. He cited ULC s628, apparently the governing code for installing any type of fireplace inserts in Canada. I haven't been able to locate this code online (I can download it for $190!) Does anyone know if the installer is correct about this? Thanks.