What is the maximum temperature that a clay flue liner must withstand without cracking?

The maximum temperature that a clay flue liner must withstand without cracking is 1,800 degrees F. This temperature threshold is critical for ensuring the structural integrity and longevity of the flue liner when it is subjected to high-heat conditions, such as those produced by combustion gases from propane or natural gas appliances. Clay flue liners are designed to manage these intense temperatures, as exceeding this limit can lead to thermal shock and ultimately result in cracking or failure of the liner. This is particularly important in preventing dangerous conditions such as chimney fires or the release of hazardous gases, thus maintaining safety standards in heating systems.