Hi everyone, as you can see I'm new to this site. I just really need answers to some very specific questions. I'm restoring an 1830 farm house with what I think is an original Rumford fireplace with a Beehive oven. I have rebuilt the chimney, 1' below roof line up, and inspected the interior that actually looks real good. I've even built a couple of small fires but don't dare for fear of burning the house down. I really want this thing to function but I don't want to devalue it's authenticity. Here are a few specs, the face of the fire box is 4'x3.5'. It has the classic modified breast/smoke chamber, but no damper. The interior of the stack is aprox. 14"x24". The height of the stack from hearth to crown is about 25'. the interior is like a small case y, that's upside down, the smaller leg of the y branches off to the oven. I want to line it for the obvious reasons, a 12" liner for the fire box and maybe a 3" for the oven. I've read ratios in regards to liners vs. the opening of the fire box being 8:1, and i'd like the liner to be easily converted from an open fireplace to a wood stove. I fear the 12" liner is too small, there would be no way to dampen the draw, a liner devalues the authenticity, the 3" liner may be too small as well, ( you just shovel embers into the oven for cooking)... I am thinking about lining the smoke chamber with a ceramic blanket, holding it in place with metal lath and re bar to insure proper placement of the liner and then finishing it with high temp cement. This fireplace is 1 of 5 or 6 major architectural details that make this farm house unique. Any replies are appreciated, I'm sure, some one must know the proper procedures to insure safe operation, that wont compromise the historical integrity of such a fireplace, Thanks.