18-28-801.17 Space around lining.

   The space surrounding a flue lining system or other vent installed within a masonry chimney shall not be used to vent any other appliance. This shall not prevent the installation of a separate flue lining in accordance with the manufacturer's installation instructions and the building code.

18-28-801.18 Existing chimneys and vents.

   Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections 18-28-801.18.1 through 18-28-801.18.4.

18-28-801.18.1 Size.

   The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For venting of oil-fired appliances to masonry chimneys, the resizing shall be in accordance with NFPA 31.

18-28-801.18.2 Flue passageways.

   The flue gas passageways shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote. Where an oil-fired appliance is connected to an existing masonry chimney, such chimney flue shall be repaired or relined in accordance with NFPA 31.

18-28-801.18.3 Cleanout.

   Masonry chimneys shall be provided with a cleanout opening in compliance with Section 18-28-801.13.