Masonry chimneys must be lined with materials resistant to vent gas effects at temperatures up to what degree Fahrenheit?

The correct temperature for the lining of masonry chimneys is 1,800 degrees Fahrenheit. This requirement is based on the need to ensure that the materials used in the chimney can withstand the high temperatures generated by vent gases without deteriorating. Chimneys are subject to various conditions, including flue gas temperatures that can reach significant levels, especially in systems that burn solid fuels or operate inefficiently. Lining materials designed to endure these high temperatures are crucial for maintaining the structural integrity of the chimney, preventing the risk of fire, and ensuring the safe expulsion of combustion gases.

Choosing a lining material rated for temperatures lower than 1,800 degrees Fahrenheit could result in degradation or failure over time, leading to potential hazards such as chimney fires or the release of harmful gases into living spaces. Therefore, building codes and standards typically specify a minimum temperature rating for chimney liners to ensure safety and efficiency in ventilation systems.