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Select the required overall installed flue height, measured from the top of the stove to the top of the rain cowl. This Twin Wall System includes a 4" (100mm) steel single wall flue pipe and a 4"-5" twin wall adaptor as standard. (Stove not included.) Push-fit system. Internal diameter: 125mm (5"). External diameter: 175mm (7"). This complete Twin Wall System is designed for the Outbacker Hygge, Ignis and Firebox XL stoves. The system starts with a steel single wall flue pipe connected to a twin wall adaptor, followed by the insulated twin wall sections and finished with a twin wall rain cowl. The overall installed height is measured from the top of the stove to the top of the rain cowl. Each kit includes: 1 × Steel single wall stove flue pipe, 1 × 4"-5" Twin Wall Adaptor, 5" Twin Wall sections (supplied in the combination required to achieve the selected overall system height), locking bands, and 1 × 5" Twin Wall Rain Cowl. The selected system height is measured from the top of the stove to the top of the rain cowl and includes the single wall flue pipe, twin wall adaptor, insulated twin wall sections and rain cowl. Overall installed height (measured from the top of the stove to the top of the rain cowl): 1m System – approximately 980mm, 1.5m System – approximately 1465mm, 2m System – approximately 1965mm, 2.5m System – approximately 2450mm, 3m System – approximately 2950mm, 3.5m System – approximately 3435mm, 4m System – approximately 3935mm. The insulated twin wall sections are supplied in the lengths required to achieve these overall installed heights. Why choose a Twin Wall System? Insulated to keep flue gases hotter for improved draw and reduced condensation. Safe for creating a new insulated chimney system where no masonry chimney exists. Suitable for indoor or outdoor installations and can pass through roofs and floors. Durable steel construction for long service life. Modular design with interchangeable section lengths to suit different installation heights. EU, US and International orders are shipped using Delivered Duty Paid (DDP). This means no surprise customs charges or import duties – the price you see is the price you pay. EU, US, and International orders are shipped using Delivered Duty Paid. This means no surprise additional customs charges or import duties for you — the price you see is the price you pay.