The Midtherm HTS 300mm Length Stainless Twin Wall Flue is a precision-engineered insulated section designed to extend single-wall flue systems through walls or ceilings with accuracy and robustness. Its effective fitted length of 252mm supports neat alignment and consistent performance across vertical or angled installations, making it suitable for residential and commercial heating systems. Compatible with wood, multifuel, gas, oil, biomass, and pellet appliances, it provides dependable operation in medium to high-temperature environments.
Constructed from 0.5mm 316 2B stainless steel for the inner liner and 0.5mm 304 BA stainless steel for the outer casing, the component delivers long-lasting strength and corrosion resistance. Laser-welded seams and machine-formed joints ensure secure, airtight connections, while locking bands supplied with male connectors enhance stability throughout the system. Rated for continuous operation at 450°C with a 4-hour fire rating, it is built to handle demanding conditions safely and efficiently.
As part of the Midtherm HTS Twin Wall System, this 300mm section meets ISO 9001 manufacturing standards, carries CE certification, and is supported by HETAS registration. Designed for long-term reliability, it features a clean polished stainless steel finish that complements modern installations. When installed and maintained correctly, it is protected by a 20-year warranty.
Features and Benefits
- 300mm section with 252mm fitted length
- 316 stainless steel inner and 304 stainless steel outer construction
- High-temperature rating up to 450°C
- Laser-welded seams for consistent, airtight joints
- Locking bands included for secure assembly
- Suitable for wood, gas, oil, biomass, multifuel, and pellet systems
- CE-certified, HETAS-registered, and ISO 9001 manufactured
- 20-year warranty with registered installation


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