| 摘要 |
A vehicle air-conditioning duct 1 according to the present invention has an oblong cross-sectional configuration. The air-conditioning duct 1 comprises a top wall 16, a bottom wall 18 and side walls 12, 14 enclosing an interior space and at least one constriction 22, 24 formed by a projection protruding from at least one of the top wall 16 and the bottom wall 18 into the air-conditioning duct 1 so as to connect the top wall 16 with the bottom wall 18. The constriction 22, 24 continuously extends in an air flow direction so that cross-sectional areas of the constriction 22, 24 are constant in the air flow direction.
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