Stretchdec is a highly flexible tube, constructed from a single layer of helical aluminium. The special folded seam results in a very high leak tightness and flexibility. The Stretchdec meets all requirements, and is qualified according to the specifications of: NEN 13180: Ventilation for buildings - Ductwork - Dimensions and mechanical requirements for flexible ducts. Can be used at temperatures between -30 °C and +250 °C.