| 摘要 |
Flue sections and an airtight venting system being made therefrom by connecting in line the flue sections. The flue section has a pair of opposite ends of circular cross-section one of which called "male end" is shaped and sized to fit into the other end, called "female end" of a similar flue section. The male end comprises at least two outwardly-projecting L-shaped grooves, a peripheral outwardly-opening recess and an O-ring mounted therein and protruding outwardly. The L-shaped grooves are positioned in such a manner to have an opening at the male end of the flue section. The recess is positioned at a distance "H" from the L-shaped groove. The female end comprises at least two inwardly-projecting keys sized and shaped to engage the L-shaped grooves of the male end of another flue section in order to lock the male end into the female end by insertion and twisting of the ends together, forming a "bayonet" type connection and a peripheral inwardly-projecting boss positioned at the distance "H" from the keys in such a manner to be aligned and pressed against the O-ring of the other flue section, making a tight seal when the male end of the other flue section is fitted into the female end of the flue section.
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