| 摘要 |
<p>The duct comprises, for a basic length, on the one hand two plane panels (2, 3) arranged on top and below and, on the other hand, two plane panels (4, 5) having laterally arranged, longitudinal edge flanges (8, 9, 12, 13) projecting on one face, the edges (10, 11, 14, 15) of the upper (2) and lower (3) panels, and the flanges (8, 9, 12, 13) of the side panels (4, 5) being pierced beforehand for the passage of fixing bolts (6).
<??>A detection panel (47) is arranged as a lining inside the lower panel (3) and is connected by its flanges (48, 49) to the side panels (4, 5), a tunnel (52) being formed between the lower panel (3) and the detection panel (47) and opening out in the duct near a bend.
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