Ok got tired of looking at inserts, and finally pulled the trigger on the PE Summit. I plan on installing it myself since it should be fairly straight forward. I have gas logs to remove and fire caulk the hole where the gas line comes up, probably have to remove the damper and block it off etc. Chimney flue will accept 6 inch liner no problem.... gotta decide whether or not to insulate it. Wish me luck, I will take some pics cuz I know yal like em.