| 摘要 |
<p>The duct has a set of centering wings (10.5) vertically established at height on constitutive modules of the duct. The centering wings are set to define an inner circle corresponding to an interior volume of a fume evacuation tube (11). The wings are arranged at certain thickness and the height, and comprise a recess (10.7) that provides a housing of an upper flange (11.1) formed on tubular components for constituting the fume evacuation tube after assembly. The fume evacuation tube is made of plastic.</p> |
