The Midtherm HTS 500mm Length Twin Wall Flue in Black is a high performance insulated section designed to extend single wall flue systems through ceilings or walls with accuracy and stability. Its compact installed length of 452mm allows precise configuration across both vertical and angled installations, supporting efficient routing in residential and commercial environments. Suitable for wood, multifuel, gas, oil, biomass, and pellet appliances, it provides consistent performance in medium to high temperature systems.
Constructed with a 0.5mm 316 2B stainless steel inner wall and a 0.5mm 304 BA stainless steel outer wall, the flue delivers strong resistance to heat, corrosion, and long term wear. Precision laser welded seams and machine formed joints ensure clean, airtight connections, while the powder coated black finish adds a modern and refined appearance. Locking bands are supplied for all male connectors, offering secure, repeatable assembly throughout the flue run.
Tested to operate continuously at 450°C with a 4-hour fire rating, the 500mm section meets Class 1 Twin Wall requirements and carries full CE certification. Manufactured under ISO 9001 quality management and supported by HETAS registration, it provides assured safety and compliance for modern heating systems. When correctly installed and registered, it is covered by a 20 year warranty for long term confidence.
Features and Benefits
- 500mm section with 452mm fitted length for accurate configuration
- 316 stainless steel inner and 304 stainless steel outer construction
- Laser welded seams for reliable, airtight joints
- High temperature rating up to 450°C
- Locking bands included for secure installation
- Powder coated black finish for a contemporary look
- Compatible with wood, gas, oil, multifuel, biomass, and pellet systems
- Certified under ISO 9001 with CE and HETAS approval






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