The Midtherm Wall Band Extension Kit 50–100mm Black Twin Wall Flue is engineered to provide a controlled increase in wall clearance for twin wall flue systems, offering an adjustable stand-off range of 50–100mm. This makes it ideal for installations that require a precise adjustment to achieve safe spacing, improved airflow around the system, or accommodation of structural features. Finished in black, it pairs cleanly with HT-S components to maintain a consistent, professional appearance throughout the installation.
The kit includes two heavy-duty extension arms designed to work with any Midtherm wall band across all compatible flue diameters. These arms ensure stable positioning once mounted, allowing installers to fine-tune the distance between the wall and the flue while maintaining full structural integrity. Their adaptability makes them suitable for both interior and exterior projects where compact yet adjustable spacing is required.
Built to the same high standards as the HT-S system, the extension kit offers long-term reliability even under continuous high-temperature operation up to 450°C. Suitable for multi-fuel, gas, oil, biomass, and pellet systems, it carries full certification and is supported by a 20-year warranty for registered installations. Its robust construction, flexible adjustment range, and compatibility across the HT-S range make it a valuable accessory for precise and professional flue system setup.
Features and Benefits
- Adjustable 50–100mm wall clearance
- Black powder-coated finish for visual consistency
- Fits all Midtherm wall bands
- Provides firm, stable stand-off support
- Suitable for 450°C high-temperature systems
- Works with wood, gas, oil, biomass, and pellet appliances
- Ideal for tight-space installations requiring controlled spacing
- Meets Class 1 Twin Wall standards
- ISO 9001 and CE certified
- Covered by a 20-year warranty
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