What is flexi-liner? And do I really need it?

Flexi-liner is used to line existing chimneys – it is inserted inside the existing clay liner, for the entire length of the chimney stack.

It is available typically in either 5 or 6″ diameters.

There are different qualities and grades of liner, we always use 904 grade. Whilst 316 grade stainless steel is cheaper, and can be used when burning cured dry logs, cured dry peat, coal, coke or gas. 904 grade stainless steel is a higher grade stainless steel, which is more resistant to corrosion, and can be used for all the fuels that 316 grade can be used for, plus where there is to be regular or continuous use of solid mineral fuels.