hello all..I'm getting ready to purchase a Hitzer coal stove, model # 50-93..it's going downstairs in the family room just in front of the fireplace..I opted for the stove instead of the insert..should I go with a full length liner??..or just enough to go up through the old damper??..my fireplace is granit stone with a metal heatalator? with the three tubes coming up to a vent..gotta cut the middle one out..chimney is two flues, one for oil furnace, other for fireplace..house was built in 58..when I moved in 4 years ago, I had chimney sweeps inspect the chimney..they installed a stainless liner in the oil furnace side, and said the fireplace side was ok as is..TIA for all advice..nice forum you guys got here..