Which U.L. standard applies to chimney liners used for venting gas appliances?

The correct standard for chimney liners used for venting gas appliances is U.L. 1777. This standard outlines the requirements for the safe and effective performance of chimney liners that are specifically designed for gas venting systems. U.L. 1777 focuses on aspects such as material properties, design parameters, and performance testing to ensure that the chimney liners can withstand the conditions typical of gas appliance venting, including temperature and pressure variations, as well as corrosion resistance.

Understanding this standard is crucial for chimney sweeps and professionals in the industry, as it helps ensure that installations meet safety and performance guidelines, preventing hazards like carbon monoxide buildup and improving the efficiency of gas appliances. While the other mentioned standards may pertain to chimney and venting products, they do not specifically address the requirements for gas appliance venting as U.L. 1777 does.