What material is commonly used for chimney liners?

Stainless steel is commonly used for chimney liners due to its durability, resistance to corrosion, and ability to withstand high temperatures. It can help protect the chimney structure from heat and corrosive byproducts produced during combustion, such as creosote and acidic gases. Stainless steel liners are particularly advantageous in gas and wood-burning applications, as they provide an effective barrier against the components that can lead to chimney damage over time.

In contrast, plastic is not suitable for chimney liners because it cannot withstand the high temperatures and corrosive substances associated with chimney use. Concrete, while strong, can be prone to cracking and deterioration over time due to the effects of heat and moisture, making it less desirable for liner applications. Brick is often used in the construction of chimney flues themselves but does not provide the same level of protection or flexibility as a stainless steel liner, particularly in repair and retrofitting situations. Therefore, stainless steel stands out as the optimal choice for ensuring safety and functionality in chimney systems.