DIYbanter - View Single Post

wrote:
in the space between the inner and outer pipes

a tri-axial pipe? are you advising people to fabricate their own,
or you know a source?

Is it so difficult to fabricate such a thing? Take two single-walled
flue pipes of different enough diameters and place one inside the other.
Space them apart using bent pieces of metal or spring clips made from
coat hangers or the like.

Anthony