External Two-Storey Installation with Vitreous Enamel from Stove


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This installation involves a safe and efficient flue system for a wood-burning or multi-fuel stove, beginning with vitreous enamel single wall flue pipe from the appliance and transitioning to an external twin wall insulated flue system running up a two-storey building.
The external system includes a 45° tee at the wall exit point. From the stove’s flue collar, a section of black vitreous enamel single wall flue pipe is fitted vertically to gain the necessary flue height and heat retention inside the room. This section is connected to a twin wall adaptor, which securely joins the single wall pipe to the insulated twin wall system. The flue exits through the external wall via an insulated wall sleeve, ensuring the required clearance from all combustible materials.
On the exterior, a 45° twin wall tee with drain cap is installed at the wall exit. This provides access for flue cleaning and condensate drainage, while offering a smoother angle for flue gas flow compared to a standard 90° tee. A wall support bracket is installed directly below the 45° tee to bear the load of the external flue system and anchor it securely to the building structure. This bracket is a critical load-bearing component and ensures the system is stable and safe. From the tee, the twin wall flue continues upward along the exterior wall.
Additional wall support brackets are installed at regular intervals (typically every 1.5 to 2 metres) along the full height. The flue terminates at a height that complies with Building Regulations (e.g. UK Document J), All external components are CE-marked, stainless steel twin wall/black insulated flue, suitable for high-temperature solid fuel use.
The installation should be carried out by a qualified installer in accordance with manufacturer guidelines and relevant building regulation.

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