forge hood with a lean

I recall seeing a plan for a smoke hood that was built with a "cantilevered
""bent" "out of square""a 30 or so degree walk"" not straight up" top to
meet a chimney at the center of the forge table (the forge cannot be moved
to fit under the chimney
because of space issues and the chimney is above center of the forge table)
.does anyone know of this site or book??
Paddy p the wannabe
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