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801.16.1 Residential and Low-Heat Appliances (General)
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- Clay flue lining complying with the requirements of ASTM C315 or equivalent. Clay flue lining shall be installed in accordance with the International Building Code.
- Listed and labeled 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).