This is a little different from the Smoky Hollow cooker.I
have one flue in the middle simply because the collar and
damper came with the kit .They are slightly round to fit the
barrel.I have also cut 2 small holes in the bottom of the
barrel rings to let grease escape.It makes great Q but was a
little more expensive to build than I first thought.The
bootom barrel is lined with fire brick to keep it from
burning out.
Mike Bridges