On Mon, 24 Nov 2003 08:34:04 -0800, "M.Paul"
wrote:

Some say that I would need to replace the existing flue, which is
approximately 25 ft long, with one that is a narrower diameter in
order to get the correct draw.

Forgot to answer this part. The installation crew used a stainless
steel chimney liner on mine. Been a couple of years back now so I
don't recall all the details but I do recollect code being mentioned
as one reason.