Domestic & Wholesale    >    Product Range    >    Chimney & Flue    >    Flexible Liner
Right & Complete, First Time, Every Time

Flexible Liner

John J Doyle Ltd are stockists of F600 and Ultraflex multi-fuel flexible flue liner.

F600 Flexible Liner by John J Doyle Ltd is our own range of multiflue flexible liner.

F600 is available in 5″ or 6″ and 316 or 904.

F600 comes with a lifetime guarantee.


Ultraflex flexible liner is stainless steel twin-lined grade 1 quality and produced to the highest of standards.
The liners are designed to withstand high temperatures and has a good resistance to corrosion.

Available in 7″ or 8″

316 Ultraflex

20 Year Guarantee

  • Made of 316 grade Stainless steel inner and 316 outer (Triple lock).
  • Suitable for burning the following fuels: dried seasoned wood, gas, oil.
  • This liner also has a 20 year product replacement (conditions apply).
  • Normal operating temperature of upto 450°C for solid fuel and 250°C for Oil and Gas.
  • HETAS approved product
  • Manufactured in the UK
  • Corrosion and crush resistant
904 Ultraflex

35 Year Guarantee

  • Made of 904 grade Stainless steel inner and 904 outer (Triple lock).
  • Suitable for burning the following fuels: Seasoned Dried Wood, Gas, Oil, Coke, Peat and Smokeless fuels.
  • This liner also has a 35 year product replacement (conditions apply).
  • Normal operating temperature of upto 450°C for solid fuel and 250°C for Oil and Gas.
  • HETAS approved product
  • Manufactured in the UK
  • Corrosion and crush resistant