Section 27-854. General requirements

Latest version.

Chimneys or gas vents shall be designed
  and  constructed  so  as  to provide the necessary draft and capacity to
  completely exhaust the products of combustion to the outside air, and to
  satisfy the following conditions:
    (a) Temperature. The  temperature  on  adjacent  combustible  surfaces
  shall not be raised above one hundred sixty degrees Fahrenheit.
    (b) Condensation. The condensation shall not be developed to an extent
  that can cause rapid deterioration of the chimney or vent.

                    
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