| 摘要 |
A rack housing that holds a plurality of insertion components includes a plurality of insertion positions that hold the plurality of insertion components in a first area of the rack housing adjacent to a first housing side, a reduced pressure shaft in a second area of the rack housing adjacent to the first area, wherein between the reduced pressure shaft and the insertion components, first openings are provided to thereby remove air heated by the insertion components into the reduced pressure shaft, at least two second openings that suction off heated air from the reduced pressure shaft, and at least two non-return arrangements located in the reduced pressure shaft and correlated to the two second openings, the non-return arrangements preventing entry of air through the correlated second opening if no air is suctioned off through this second opening.
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