| 摘要 |
PROBLEM TO BE SOLVED: To prevent exfoliation of an upper shield to appropriately maintain a pressure difference between cooling air and warming air even in the case that a pressure in a passage space becomes excessively higher than an outside pressure.SOLUTION: In a computer room air conditioning system, an upper shield is provided between top surfaces of racks on both sides of a passage 4 where cooling air flows, and end part shields are provided at both end parts of the passage 4. A passage space S is partitioned by the upper shield and the end part shields. A first ventilation part 31 and a second ventilation part 42 which can be opened/closed to the upper shield and the end part shields are provided. Each of the ventilation parts 31 and 42 is provided with a master blade 36 which can be opened/closed to the passage 4, a slave blade 37 capable of opening/closing an opening 36b formed on the master blade 36, and a leaf spring 38 which urges the slave blade 37 in a direction in which the opening 36a is closed. |
