Hi-- we use this chimney as a sort of a hood/insulator for the forge at home and at shows, mostly for start up. We have not worked it up as an option on the forge, but you can see how it is made: a plate of steel, bent at edges to span the forge. A collar is welded to that to support 6" diameter stove pipe. It is not exactly an effective solution as an indoor hood, though. At some point we will probably offer something like this as an option because it is handy.