We just moved into a new home, a raised ranch. The House has 2 - 8 inch openings into a single chimney (O.D. 13x9) one in the basement and one on the first floor. The lower opening is in a child's bedroom so we have no plans to use it. The upstairs opening is in the living room where we would like to add in a wood stove, both openings are currently covered. I visually inspected the chimney from the roof and it looks to be in good shape. Can I add a stove in to the living room directly connected to the chimney or do I need to have a liner put in?