What grade of stainless steel should my chimney liner be ?

Multi fuel chimney liner is manufactured using 316 grade stainless steel, 904 grade stainless steel, or a combination of the two. The manufacturing process is exactly the same and, in fact, the same machines produce both 904 and 316 grade chimney liner. So which grade should you use?

316/316 Grade:- This liner uses 316 grade stainless steel for both the inner and the outer skins. It is suitable for use on appliances burning the following fuels:- gas, oil, coal, coke, cured dry logs and cured dry peat.

904/316 Grade:- This liner uses 904 grade stainless steel for the inner and 316 grade stainless steel for the outer skin. It is suitable for use on appliances burning the following fuels:- gas, oil, coal, coke, cured dry logs, cured dry peat and smokeless fuels. This is the most economical liner for use with smokeless fuels.

904/904 Grade:- This liner uses 904 grade stainless steel for both the inner and the outer skins, the best chimney liner you can buy. It is suitable for use on appliances burning the following fuels:- gas, oil, coal, coke, cured dry logs, cured dry peat and smokeless fuels. Recommended particularly if you are slumbering your appliance overnight, or for heavy usage.

Chimney liners can be used on open fires as well as closed appliances like wood burning and multi fuel stoves.