The usable length of the tubes is 952mm, the total length is 1000mm Heat Design twin wall is available in three lengths which can be easily combined to achieve the required height for the installation. Each joint is firmly secured using the locking bands supplied AISI 316 stainless steel flue with 25 mm thick rock wool insulation. 7 (175mm) Stainless Steel Insulated Twin Wall Flues - Flexible Flue Liners AISI 316 Insulated Chimney Pipe Sistema Stainless Steel Bottle Double Walled 1L - Grocery Box Stainless Steel Flue Pipe The size of the diameter shown in the selections refers to the inner diameter and the second to the outer diameter. Huge Range At Affordable Prices Of Twin Wall, Vitreous Enamel, Single Wall Flues Or Flexible Flue Liner. Visit Laois Stone The elements must be installed according to the smoke direction indicated on the label of each product. Insulation made from rock wool of minimum density 90 kg/m3 with a thickness of 25 mm
