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Flex to Twin Wall Adaptor Ø 175 (2-175-101)

National Flues presents the Flex to Twin Wall Adaptor Ø 175mm – a robust, stainless steel solution designed for seamless connections between flexible flue liners and twin wall chimney systems. Engineered for woodstoves, gas, oil, and coal appliances, this CE marked and HETAS approved adaptor guarantees safety, reliability, and efficiency. Read more...
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At a Glance

  • Constructed from premium 304 & 316-grade stainless steel
  • High-density compressed rockwool insulation for optimal efficiency
  • Fully HETAS approved and CE marked for safety
  • Secure screw fix coupling for reliable installation
  • Compatible with a range of appliances (woodstoves, boilers, gas, oil, coal)
  • Maintains a safe 50mm clearance from combustible materials

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

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Have Questions?
Phone: 01670 206999
Email: sales@nationalflues.com

The Flex to Twin Wall Adaptor Ø 175mm is designed for use with solid fuel and gas/oil appliances, including woodstoves, gas coal effect fires, and boilers. Constructed to the highest standards, the outer skin of the adaptor is crafted from 304-grade stainless steel with a thickness of 0.4mm, while the inner skin is made from premium 316-grade stainless steel, also 0.4mm thick. The insulation consists of high-density compressed rockwool, ensuring optimal safety and efficiency.

Each part is fully welded, and the system maintains a minimum clearance of 50mm from any combustible materials. Fully compliant with HETAS standards and CE marked, the Flex to Twin Wall Adaptor guarantees safety and performance. The installation process is straightforward, involving a screw fix coupling to the flexible flue liner and securement using a Locking Band.

Ensure that the transition is made inside an existing class 1 chimney, keeping flexible liners out of sight.

SKU: 2-175-101

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, November 17th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.

About National Flues Ltd +

We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.

Technical Specifications
Product NameFlex to Twin Wall Adaptor Ø 175mm
Outer Material304 Stainless Steel (0.40mm thick)
Inner Material316 Stainless Steel (0.40mm thick)
InsulationHigh-density compressed rockwool
ApprovalsHETAS / CE
ClearanceMinimum 50mm from combustibles
ApplicationsWoodstoves, boilers, gas, oil, and low sulphur coal appliances
Installation should be carried out within an existing class 1 chimney. Begin by attaching the screw fix coupling to the flexible flue liner. Then, secure the adaptor using the provided Locking Band, ensuring that a minimum clearance of 50mm is maintained from any combustible material. It is essential that the transition takes place inside the chimney to ensure that no part of the flexible liner is visible externally. Always follow manufacturer guidelines and consult a qualified professional if unsure.

The Flex to Twin Wall Adaptor Ø 175mm is compatible with solid fuel and gas/oil appliances such as woodstoves, gas coal effect fires, oil and gas boilers, and other solid fuel devices.

The adaptor is made of high-quality 304 grade stainless steel for the outer skin and 316 grade stainless steel for the inner skin, both with a thickness of 0.4mm. The insulation is compressed rockwool with a density of 200kg/m3.

Yes, the Flex to Twin Wall Adaptor Ø 175mm is fully HETAS approved and CE marked, meeting stringent safety and performance standards.

The adaptor is installed using a screw fix coupling that attaches to the flexible flue liner. Secure all parts with a Locking Band and ensure a minimum distance of 50mm from any combustible materials.

Maintain at least 50mm distance from the outside of the flue to any combustible material, such as wood or plasterboard.

No, the transition must be made inside an existing class 1 chimney with no flexible liner visible outside the brick or clay chimney.

The product holds the following designation numbers: EN1856-1 T600 N1 W V2 L50040 G50 and EN1856-1 T200 W V2 L50040 O20.

 

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