Flue Solutions » FuranFlex » Gas Heating


FuranFlex® was given the permit necessary for its application as flue gas deflector in Hungary in 1996 and then the same permit was given in 2000 in Sweden as well. FuranFlex® was the first composite liner tube, which obtained the CE qualification in 2013 and the UL® Listed mark in 2014. In many countries, FuranFlex® has special local permits as well.


Kompozitor Kft. (further referred to as Manufacturer) provides to undertake 25 years of guarantee for the FuranFlex® liner tubes.

Guarantee conditions:

  • Application according to the ETA-regulations (permit number: 12/0346) meeting the local building and construction industrial regulations.
  • The contractors shall have the certificate issued by the Manufacturer verifying due knowledge and competence regarding the FuranFlex® technology.
  • The installation of FuranFlex® has been carried out using the tools and equipment approved by the Manufacturer (see technology description).
  • Existence of the duly Bill of Guarantee issued by the Manufacturer.
  • Certificate of the inspection and maintenance of the chimney as per the relevant local regulations.
  • The guarantee questionnaire has been filled by the contractor carrying out the installation and returned to the Manufacturer.

The guarantee shall not be valid if:

  • The burning equipment connected to the flue gas deflector system has been modified without a due permit.
  • The prescribed inspections/maintenance has not been carried out on the heating equipment.
  • Irregular modifications have been carried out on the flue gas deflector system.

The guarantee only applies to the repair of the liner tube and shall not be valid for any direct or indirect damages concerned.


Technical Data

Certification operating temperature (varies by country) 200-350 °C
EU classification (ETA-12/0346) T200 P1 W 2 OXX
Fire classification B s1 d0
30 minute heat resistance 500 °C
Fuel gas / oil
Diameter 60 – 1200 mm
Length 3 – 80 m
Maximum declination angle 30°
Wall thickness 2,5 mm
Density 1,7 g/cm3
Tensile strength 150 N/mm2
Corrosion resistance 3 – 12 pH
Cold resistance -50 °C
Thermal conductivity 0,27 W/m.K
Thermal expansion 24.10-6 m/m.K
Health and environment Certified for ventilation too

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