Midtherm Matt Black HT-S is a twin wall insulated flue system designed for medium and high temperature applications across domestic and commercial installations. Combining high performance with a sleek architectural finish, the system is suitable for gas, oil, solid fuel and biomass appliances.
Manufactured using advanced welding and forming techniques, HT-S delivers consistent joint integrity and reliable long-term performance. The precision socket and spigot jointing system ensures a secure, close-fitting connection, while the locking band with over-centre clip provides fast, dependable installation and a clean external finish.
Constructed from high-grade stainless steel, with a 316L inner liner and 304 outer casing, and insulated with high-density mineral wool, the system maintains thermal efficiency and safe operation under elevated temperatures.
Finished in a durable matt black architectural powder coating (RAL 9005, low gloss), HT-S is designed to complement visible flue installations where aesthetics are as important as performance.
Manufactured and stocked in the UK, HT-S offers fast availability with flexibility for bespoke requirements.
Applications:
- Gas appliances
- Oil installations
- Solid fuel and multifuel systems
- Woodburning stoves
- Biomass and pellet systems
Key Features:
- Twin wall insulated construction
- Matt black powder-coated finish for visible installations
- Suitable for medium and high temperature applications
- Precision socket and spigot jointing system
- Locking band with over-centre clip for secure installation
- Smooth external profile for improved aesthetics
- Manufactured and stocked in the UK
Specification:
- Inner liner: 0.5mm 316L stainless steel
- Outer casing: 0.5mm 304 stainless steel
- Insulation: 25mm high-density mineral wool
- Finish: Matt black powder coat (RAL 9005, ~30% gloss)
- Maximum operating temperature: 450°C
- Diameter range: 125mm – 350mm