VentilFlex 25 Green

VentilFlex25 Green

VentilFlex 25 GreenFlexible composite liner for ventilation ducts/exhaust ducts

DIN EN 12237, TG 1217
Pressure class: D
Fire class: B-s1, d0
Fire resistance class: Class EI 15

What is VentilFlex25 Green?

VentilFlex25 Green

VentilFlex25 Green is based on a glass fibre reinforced thermosetting resin, which is as strong as steel, when set, but has much better corrosion resistance than other materials. It is extremely thin (circa 3mm), has no joints and is installed by Kompozit’allUK’s trained and certified engineers, providing the guaranteed solution for ventilation duct and exhaust duct lining applications.

It is installed as one continuous lining, totally waterproof and airtight liner, providing a smooth easily cleaned duct and access is only required at the ends. Air extraction ducts up to 1000mm diameter and over 50m in length have been installed swiftly to ensure minimum disruption. Once installed it is airtight and water-resistant.

All duct shapes can be obtained, rectangular, triangular, circular and many more. VentilFlex25 is continuing to expand into the commercial sector, with recent installations including municipal buildings, hospitals, schools and colleges, hotels, public houses and restaurants, with many more in the pipeline.

Why composite material?

VentilFlex25 Green is made of thermosetting resin material with fibre glass reinforcement (composite) that has physical (steel strength) and chemical (acid-resistant, alkali-resistant) properties that are perfectly suited for lining ducts. Its special resin composition guarantees high thermal resistance.


FAQWhy Choose VentilFlex25 Green Over the Alternatives?

  • The most flexible lining system available, from 80mm to over 1000mm diameter
  • Will mould to the shape of the duct and can increase and decrease in dimensions through the duct run
  • Maximises lining diameter for efficient operation
  • One of the highest fire resistance liners (tested and proven)
  • High insulation for better fire containment
  • Best corrosion resistance – protecting occupant’s health
  • Quick & clean to install – minimises disruption
  • Long working life – best value for money
  • Guaranteed for 25 years


Why Choose an Accredited Kompozit’allUK Installer?

Ventilation Pipe

VentilFlex25 Green is fast and easy to install by engineers with the relevant training, skill and product knowledge. Kompozit’allUK engineers are factory trained and experienced to ensure your installation is completed within budget and timeframe, and subsequent maintenance issues are avoided.

Some independent, unlicensed installers may claim to offer VentilFlex25 Green solutions. However, we strongly recommend only working with a Kompozit’allUK registered installation partner.

Our partners have the equipment and training to provide accurate CCTV surveys and efficient installations. This is essential for you to get the right specification and size of lining. Each engineer and surveyor is required to renew their certification on an annual basis; keeping their skills and knowledge up-to-date.

Request a Quote

For a fast, no obligation quote, or for any queries about installation, please call 01622 717374 today, or send an email to