double wall tubular element for chimneys with closure of the crawl space to an upper and lower ring between them accoppiabili crowns

摘要

tubular element (1) for evacuation of smoke like chimneys, comprising two walls (2)(3) between them, forming a coaxial jacket (4) filled with insulation material (5) in which the closure transverse upper and lower of the crawl space (4) is achieved by respthe directives crowns upper ring (6) and lower (7) whose cross section is a flat surface to a ring (6a.7a) parallel to said axis and respectively estendentisi towards the tip (1a) and (1b) of the lower tubular element (1).said edge (7b) within the lower vertical crown (7) being folded inward to form a further ring (7b) coaxial to enable mating male womenna between two tubular components (1) post with inner walls (2) superimposed on discensionale and free to expand axially to the thermal expansion is also provided means (4a)8, 9) for locking the coupling ring.