I have a masonary fireplace that smokes most of the times that I have tried to use it. It was built by an experienced stonemason about 4 years ago. When told about the problem he added another row of river rock to make the opening smaller and increase the draw. I never know when or why it smokes. It usually starts out fine and then the smoke starts puffing into the room. I have tried opening a window, making sure there are no fans on in the house etc. I am now thinking of getting an insert. I have checked with Rich's Hearth and Home and they suggested a Lopi Answer. I live in the Seattle area. My house is heated with gas and I mainly want a wood burning fireplace or stove because I love wood fires Can't take much more smoke though! I am not very technical and want something that is fairly foolproof when installed properly (obviously I won't be doing that myself)! I don't want to give up and just put a plant in the fireplace opening! It is curved, 36 inches hight at the top of the curve and is real river rock with a exposed rock chimney up the front of the house. I have two large trees to the west side of the house and I have read that this can effect the draw of a fireplace. Any help would be greatly appreciated. I just don't want to buy an insert that will be more of a headache than I have now. Myrtie (Tana)