| 摘要 |
Outdoor grating, which is intended to be placed in the inlet opening of an air duct leading to an interior room space and which grating comprises a frame 1, 2, between the vertical parts 1 of which there are grating bars 3. The grating bars are hollow and in the leading or outside edges of the bars there are orifices 4, positive pressure having been generated inside the bars, by means of a fan 5, for example, which produces an air flow directed evenly outwards in front of the outdoor grating. <IMAGE>
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