| 摘要 |
This system is for ventilating a housing or a housing portion that has to house a contents (<bold>39</highlight>) and has ventilation grids (<bold>33, 35</highlight>) for said contents, said grids being formed from segments of material leaving a gap between them, characterized in that these segments of material are arranged at at least two levels (<bold>9</highlight><italic>a, </highlight><bold>9</highlight><italic>b</highlight>) offset depthwise in the general direction of entry of a gaseous fluid into the housing or the housing portion through the grid in question, in order to constitute, by grid, a multiple-grid system, the grids being offset depthwise with respect to one another.
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