The FLEX series of pipes are a wide range of pipes that along with SPG and SP series make up most of the series of stainless steel wall flues. Smooth inside wall is a special feature in the TDX fouble structure flexible metal liner of varying thicknesses and are made using AISI 316L stainless steel. The components are the perfect solutions for the rebuilding of existing flues of eccentric shapes. They have great flexibility and resistant from heating and torsional stresses. The roughness is low in the inside of the wall which thereby increases the performance and negates any losses of pressure and eliminates deposits. It is made to last in all types of conditions ranging from dry to wet under negative pressure and temperatures of even 600ºC. The diameters of these pipes range from a minimum of a 60mm.