| 摘要 |
An air supply duct (1) is provided on its lower side with an elongate air outlet. This has rails (3) which on their mutually facing sides are provided alternately with recesses (4), which are concave in vertical section, and convex projections (5) which are approximately complementary thereto. Present on both sides of the projections (5), i.e. between the recesses (4) and the projections (5) are steps which project beyond the recesses (4) but not as far as the projections (5). The two rails are then arranged and interconnected in such a manner that the projections (5) engage in the recesses (4). The steps of the two rails (3) rest on one another and have the effect that outlet openings (7) remain free between the mutually facing surfaces of the recesses (4) and projections (5). The ends, which face the free space, of successive outlet openings (7) are inclined to different sides in relation to the longitudinal central plane of the air outlet so that the successive air streams are guided in different directions. <IMAGE>
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