The Single Storey Extension/Outhouse Flue Kit – 5″ Twin Wall Flue (125mm) is an all-in-one chimney flue solution designed for installing a wood burning stove in a single-storey extension, outhouse or garden shed. Supplied with the essential components required to create a complete twin wall flue system, this kit provides a convenient and installer-friendly solution while helping to simplify the installation process. The 125mm (5″) twin wall flue is available in a choice of stainless steel or matt black powder-coated finishes, allowing you to select the option best suited to your installation.
The complete kit includes a flat appliance twin wall adaptor, two 1000mm straight flue lengths, a 500mm straight length, twin wall roof support, your choice of roof flashing, a storm collar, rain cap and 130–210mm wall support. The flue system is fully welded and insulated with high-density rockwool, providing continuous insulation throughout the system with no thermal bridges. It requires just 60mm clearance from combustible materials, making it a practical choice for a variety of single-storey stove installations.
Designed with installers in mind, the 5″ Twin Wall Flue Kit offers quick and straightforward assembly and is supplied with locking bands for secure connections. The system is CE and HETAS approved and can be used for domestic heating and hot water systems, while also meeting biomass regulations. With a comprehensive selection of components included, durable construction and a 25-year warranty when installed by a competent person, this kit provides a dependable twin wall flue solution for extensions, garden rooms, outhouses and similar applications. Always confirm the suitability of the components with your HETAS-registered installer before installation.1x 37-125-005(BL)2-125-005(SS), 2x 37-125-010(BL)2-125-010(SS), 1x 37-125-011(BL), 1x 58-125-067(BL), 1x 58-125-182(BL), 1x 37-125-090(BL), 1x 58-125-053(BL)
Key Features
- Complete 5″ (125mm) twin wall flue kit for single-storey installations
- Ideal for extensions, outhouses and garden sheds
- 2 x 1000mm and 1 x 500mm twin wall straight lengths included
- High-density rockwool insulation with continuous insulation throughout
- Only 60mm clearance required from combustible materials
- CE and HETAS approved for suitable applications
- Stainless steel or matt black powder-coated finish options
- Includes roof support, flashing, storm collar, rain cap and wall support
- Supplied with locking bands for secure and straightforward installation
- 25-year warranty when installed by a competent person
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