I live in MD suburbs near DC and had my flue lined in prep for a new dual fuel furnace/heat pump. I asked the installers to look at my Tremont 260 fireplace insert and they opened the back of the stove and determined it has an 8" connector. Chimney man said they would have to knock out the tiles inside the chimney to get an 8" line through, and then line it with vermiculite. Anyway, I decided to get a new wood stove insert with a 6" connector, so they could just use the standard 6" liner to connect to new stove. I found an Ashley AW740 insert that has the exact same measurements as my existing one, only it has a 6" connector. My question, am I living in a fools paradise thinking I can just remove my existing one, and slide the new one in place and have the chimney liner connected and bob's your uncle? I do have the original permit/inspection from the county issued in 1988, for the TAC-260