Flexible twinwall stainless steel chimney liner is used to reline an existing masonry chimney.
In the 80's and 90's mostly 8" or 200mm diameter flexible was used to reline chimneys where the ceramic chimney pots had cracked after the chimney caught on fire.
Gradually over time, stoves became more popular and narrow diameters became more prevalent as the narrow diameter is designed for use with stoves
Two grades of flexible liner are widely used in Ireland today, 316 and 904.
316 is designed for timber and low volatile fuels and 904 is used when the fuel being burned contains a lot of sulphur.
SHL supply both 316 and 904 grade stainless steel flexible chimney liner for solid fuel.