| 摘要 |
The cooling-air outlet of a vehicle comprises a grill and a frame which encloses said grill and is provided on an outside wall of the vehicle. In order to render the grill, as far as possible, invisible in a thermal-imaging environment, the frame projects beyond the grill to the outside and comprises a hollow profile which forms a flow channel with an inlet opening and an outlet opening, a difference in pressure prevailing between inlet opening and outlet opening. This difference in pressure may be produced by an external or internal blower.
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