IMPROVEMENTS TO AN IMPERVIOUS CONNECTION SYSTEM FOR CHIMNEYS AND PREFABRICATED MODULAR DUCTS

摘要

The invention relates to improvements to an impervious connection system for chimneys and prefabricated modular ducts. The invention consists in using a metal/metal fitting without complementary synthetic gaskets. According to the invention, one of the modules to be joined (8) terminates in a truncated-cone-shaped section (3) and the cylindrical end of the other module (11) is connected thereto in a tongue-and-groove manner. The improvements consist in extending the aforementioned truncated-cone-shaped section (3) into a wide cylindrical section (9) comprising one or more annular flanges (10-10') defining two annular tangential lines which provide a pressure connection with the other module (11) at essentially-cylindrical areas, thereby maintaining the imperviousness and t