Semi-Flexible Air Duct

Semi-flexible air ducts are produced with the INTERLOCK seam system; they are leak-tight and non-combustible, and are used where mechanical strength is required. Aluminum models operate from -25 °C to +250 °C and at pressures up to 3000 Pa; the thermally and acoustically insulated model includes a perforated inner duct and 25 mm glass wool. The 316 L stainless model is used up to +800 °C in chimney connections of natural gas, LPG and fuel oil appliances.