Twinwall flexible liner is used to line or reline a masonry chimney.
It is also used when installing free-standing or inset / insert stoves where the chimney flue diameter needs to be adjusted to suit the needs of the stove.
Twinwall flexible liner consists of two layers / ribbons / strips of stainless steel (hence the name Twinwall) that are interlocked to create a continuous yet flexible length of stainless steel tubing.
These interlocked strips look like they are woven together. The ‘weave’ used in SHL’s flexible liner is categorised as “Heavy Duty”.
This heavy duty weave ensures that the stainless steel liner is very tough, difficult to dent yet extremely flexible.
There are two grades of twinwall flexible stainless steel liner available.
- 316 Low Carbon Stainless Steel (inner wall) / 316 Low Carbon Stainless Steel (outer wall) Suitable for used with oil, gas, solid fuels such as coal, wood and peat.
- 904 Low Carbon Stainless Steel (inner wall) / 316 Low Carbon Stainless Steel (outer wall) 904 stainless steel has greater resistance to sulphuric acid than 316 stainless steel, so in addition to the fuels mentioned above, it can also be used with anthracite and smokeless coals, whose smoke can be quite corrosive and a more intense heat.