Hey everyone. I've been lurking and studying for a few weeks now. Great site! I've search various articles and posts and have learned a lot but want to clarify several things please. Background info: 1) Live in Cincinnati 2) 3 story brick home, 2200sq ft, circa 1904 3) Having a guy come out to measure this week and inspect so not sure on specifics yet 4) Chimney is internal and at least 30ft 5) Not sure if it's lined but I don't think it is as when I broke through the false wall that was built over the fireplace, I found a deep pile of what appears to be old mortar. It's so old it looks like dirt. So, I'm ordering a Jotul F500 Oslo and will snug it right up to the opening on the existing fireplace. I'm cutting into my floor to extend the hearth to Jotul's specs. I'll be laying slate over concrete board but it will be flush with the rest of the floor. I plan on running a flex liner and will insulate it regardless of whether or not the chimney is lined. My questions are these: 1) I keep reading about flex connectors and tees. Does having a tee off the back of the stove make for easier cleaning and if so, how? Won't I still have to pull my stove out of the fireplace opening at each cleaning? 2) If my chimney is in fact 30ft or more, can I safely and effectively insulate the top 25ft of the liner? Most blankets I see are 25ft in length? Can I leave an un-insulated space between the bottom block plate and where the insulation would start or should I just scoot the block off plate further up the chimney to meet the insulation? 3) The flue, being 6", insulated, and 30ft will have a pretty healthy draft I assume. Is it possible to draft TOO much? 4) Also reading through Jotul's warranty it states that warranty is voided if not installed by a qualified installer. Anyone have experience or opinions on this? Define qualified. I will probably be installing this unit myself with the help of a master carpenter who has installed and lined dozens of stoves and chimneys. We will follow their installation instructions exactly. So...? I know I've been kinda "wordie" with my first post, but I'm just excited and nervous to do a good job. Thanks for any input.