Fireflexmaster

Twin wall stainless steel flexible flue liner and accessories

Fireflexmaster is a high performance twin-walled flexible flue liner designed and approved for use with all fuels including gas, oil and approved solid fuels.

  • Triple Lock Joint System

    links inner and outer liner walls to provide strength and stability

  • Lifetime warranty

    will see any faulty liners replaced during the appliance’s lifetime – subject to terms and conditions

  • 100% made in the UK

Technical details

Fuel typeGas, oil and approved solid fuels
Diameter range:100mm, 125mm, 150mm, 175mm, 200mm
Inner liner material0.1mm grade 316L stainless steel
Outer casing material0.1mm grade 316 stainless steel
Joint methodTriple lock joint system
DesignationsBS EN 1856-2 T600 N1 D VmL40011 G
BS EN 1856-2 T600 N1 W VmL40022 G
CE approvedYes
Maximum operating temperature600°C negative pressure
WarrantyLIFETIME WARRANTY

How do I register for Lifetime Warranty?

All Fireflexmaster liners will now have a standard LIFETIME WARRANTY. Warranty registrations are now automatic, you don’t need to complete any complicated forms. Your invoice confirms you purchased the liner from Docherty Group and a copy is required when requesting warranty service.

If you have misplaced your invoice, you can easily print a copy from your web shop account by accessing “My Account” and locating the order under “My orders”.

Did Fireflexmaster’s warranty coverage change recently?

Yes, Fireflexmaster’s warranty terms changed in 2017. The coverage types are as follows:

Flexible flue liners purchased before 31 December 2017 are covered by the following warranty:

  • 10 years conditional warranty for Fireflexmaster 316 liner
  • 20 years conditional warranty for Fireflexmaster 904liner

Flexible flue liners purchased after 1 January 2017 received an automatic Lifetime Warranty. No warranty registration is required.

What does and doesn’t my warranty cover?

WARRANTY CONDITIONS:
  1. H Docherty Ltd obligations under the terms of this warranty are to supply replacement product for failures due to manufacturing defects only.
  2. It specifically does not cover labour costs, or any other incidental or consequential losses.
  3. The complete installation has been designed and installed in accordance with Approved Document J of the Building Regulations and any Local or National Building Regulations.
  4. The liner has been installed in accordance with H Docherty Ltd installation instructions.
  5. The installation has been completed by a HETAS or NAPIT registered installer, or alternatively has been approved and signed off by Local Authority Building Control.
  6. A Notice Plate must be visible stating the date of installation, the name and address of the installer and the type, size and make of the liner.
  7. The liner must not be modified or changed in any way
  8. If you change the appliance, it is best practice to also change the liner.
  9. The Lifetime Warranty is non-transferable and only applies to the initial purchaser of the product
  10. Fuel
    8.1. Fireflexmaster is suitable for use on oil, gas and approved solid fuels.
    8.2. Use only high quality solid fuels as recommended by HETAS or SFA.
    8.3. In the case of wood the moisture content should be no greater than 20%.
    8.4. 316L grade stainless steel flue liners are suitable for continuous use with oil, gas & wood. It is also suitable for occasional use of mineral fuels, but this must be limited to 20% of the total fuel burnt to be covered by the LIFETIME conditional warranty. It is not suitable for long term or continuous use with mineral fuels such as smokeless fuels or bituminous coal.
    8.5. 904L grade stainless steel flue liners are suitable for continuous use with oil, gas & wood. It is also suitable for occasional use with mineral fuels, but this must be limited to 20% of the total fuel burnt to be covered by the LIFETIME conditional warranty.
  11. The appliance Fireflexmaster is serving must not be located where there is risk of chemical contamination
  12. Long periods of slumbering will greatly reduce the life expectancy of Fireflexmaster. For this reason slumbering is not
    recommended.
  13. Chimneys located on external walls, or large chimney voids and tall chimney stacks should be insulated to avoid the risk of condensation and corrosion.
  14. Evidence of a chimney fire will invalidate this warranty.
  15. When burning smokeless fuels the liner must be swept at least once a year by a competent professional chimney sweep (such as APICS, GMCS, or HETAS approved sweep) and certificates must be kept and made available in the event of a warranty claim. When burning wood or bituminous coal, the liner should be swept at least twice a year.
  16. The use of proprietary cleaning compounds are not recommended and will invalidate the warranty.
  17. A suitable system for sweeping Fireflexmaster liners would be a Viper with 7mm ROD for liners up to 8” and a 9mm ROD for 8” and above. The use of power brush systems is only recommended for straight flues and the flue must only be power swept on the downward direction with the brush being pushed up the flue. With a suitable brush head with lateral whip lines, brush heads that have whips terminating in the centre of the brush with exposed protruding ends are not recommended.
  18. To validate the warranty, the installer must register the installation by completing the registration form at
    www.docherty.co.uk/liner-warranty-registration/. A warranty confirmation will be sent by way of receipt, this should be kept in a safe place as it will be required in the event of making a warranty claim.
  19. Making a warranty claim
    17.1. The householder/user should make any warranty claim against the installer or the company or individual they purchased the product from.
    17.2. H Docherty Ltd will only accept warranty claims from those individuals or companies that purchased the goods directly.
    17.3. Claims should be made through the H Docherty Ltd branch network (www.docherty.co.uk) quoting the warranty registration number, date of installation, type and diameter of product, appliance, fuel used and details of the fault or warranty claim.
    17.4. In all cases, H Docherty Ltd reserves the right to inspect the product in situ before agreeing to replace any product under the terms of this warranty.
    17.5. If the reason for failure is anything other than a manufacturing defect, then H Docherty Ltd reserve the right to charge for any relevant inspection
  20. Nothing in this warranty affects the consumer’s statutory rights under the Customer Rights Act 2015.

How to claim Warranty Service

Contact your local Docherty branch quoting your original order number or invoice number

Downloads

Fireflexmaster brochure

Installation instructions

Fireflexmaster price list

Request a quote