Ultraflex Flexible Flue Liner Components

Flexible chimney flue liner for lining chimney stacks where no clay, terracotta or concrete lining exists. Constructed with two layers of stainless steel, available in 316/316 and 904/904 grade, these chimney liners increase the efficiency of the chimney to extract combustion gases and carbon monoxide from your stove, fireplace, or appliance.

Distinguishing between 316 and 904 flue liners lies in the composition of their stainless-steel layers. Stainless steel, a blend of iron ore, silicon, nickel, chromium, molybdenum, and carbon, yields a corrosion-resistant steel variant. Varying the exact proportions of these elements alters the steel's properties, influencing factors like corrosion resistance, hardness, and malleability, resulting in different grades.

The 904 grade boasts enhanced resistance to corrosive chemicals compared to the 316 grade, particularly with acidic residues from fuel combustion common in chimney flues. Consequently, it comes at a higher cost, with a fascinating fact being its usage in Rolex watches.

For most stove requirements, a multi-fuel 316 grade liner suffices. However, if your plans involve burning smokeless fuels, coke, peat, significant coal consumption or prolonged stove operation, opting for a 904/904 grade liner is recommended.

Suitable for chimney repairs or new wood-burning stove installations alike and compliant with UK building regulations, Ultraflex flexible flue liners are HETAS approved for use with DEFRA approved stoves, fireplaces, and appliances. Both grades come with a lifetime guarantee, applicable for as long as you own the property.