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The Duoflex series flexible ducts are a system designed specifically for the renovation of old degraded flues. This system, being flexible, ensures easy tubing operations, even if the vertical path is not regular. The Sabiana Duoflex pipes are made from AISI 316 L stainless steel, with two layers: the outer layer is corrugated section that as well as strengthening the structure, acts as a heat sink, while the inner layer is smooth and therefore offers very low resistance to the flow of flue gas and, at the same time, allows any condensate to run back down. 
The Duoflex series includes 11 different inside diameters (from 80 to 300 mm) and a complete series of fittings for connection to the Sabiana InoxMono series elements.