Flue lining systems for use with residential-type and low-heat appliances shall be limited to the following:
- Clay flue lining complying with the requirements of ASTM C 315 or equivalent. Clay flue lining shall be installed in accordance with the Florida Building Code, Building.
- Listed chimney lining systems complying with UL 1777.
- Other approved materials that will resist, without cracking, softening or corrosion, flue gases and condensate at temperatures up to 1,800°F (982°C).