I have a three store house with a chimney thats goes through the center of the house . I want to take it down and move it to the side of the house .Its a big job . I have a oile furnace and its pretty new . What size block do I need. And any thing else
You would need to conform to the local building codes on this. Best to check with your building dept for the specifics.
You might have the option to just box in a chase and run a stainless flue to the top.