A chimney lining is made out of nonflammable material and lines
the inside of the chimney. All fireplaces and fuel-burning
equipment, such as gas stoves and furnaces, require some type of
chimney. Chimneys must provide enough draft to supply an
adequate amount of fresh air to the fire which will then expel
the smoke and gasses that are emitted by the fire. To help in
this process, a chimney lining is necessary. A chimney lining
should be smooth, clean, and non-porous (POOR-us) so that it is
easily cleaned and moisture resistant. The liner should be at
least the size of the opening that connects the fireplace,
stove, or furnace to the chimney. Because smoke and heat travel
upward in a spiral motion, a round shape is most desirable. If a
round liner is not available, a square or rectangular shaped
liner with rounded corners is more efficient than a liner with
sharp corners. Any space between the liner and the outer wall
should be dead air space rather than circulating air. For more
information about chimney lin