Hey guys (and gals?). I am Cathy, live in Virginia, just purchased my second home ever. First home didn't have a fireplace, but this one has a great fireplace in the family room. The house is oil heat ($$$$$) so I am looking at getting some additional warmth from a fireplace insert. As seems typical from what I have read on here, I am like most women, and don't want a stove That being said, here are some specifics... Fireplace opening is 42 long, 28 high, and 20 deep. The current metal liner is 14 inches in diameter, I believe. Damper is one of those at the top of the chimney with a chain. Question I have, I am leaning towards getting the Osburn 2200 insert. Can I just leave my current liner as/is, or do I need to do something to be able to use the insert? Ex BF says that I can just stick it in my fireplace and away i go, but something doesnt sound right about that? Purpose of the insert is secondary heat for just that room and the "sunroom" next to it, and up into the kitchen/foyer area. I still want to be able to sit in that room when the insert is going, rather than get chased out because it is too hot. Thanks for your help in advance!