| 41. | Russian experts say many have back entrances and ventilation shafts through which Taliban forces might escape.
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| 42. | The new company decided to cease production from No . 3, which became a ventilation shaft.
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| 43. | The two eventually resort to climbing through a ventilation shaft to a hallway with an elevator.
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| 44. | They end up sneaking through the ventilation shaft and find out that Pyro had followed them.
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| 45. | Kate then climbs into a ventilation shaft.
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| 46. | The new direct access ventilation shaft meant cutting off a considerable portion of the adjoining Criterion Restaurant.
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| 47. | At least one ventilation shaft for the underground gallery leading water to Mina dos Orf�o was disturbed.
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| 48. | For example, a massive ventilation shaft in the middle of the Santa Monica Mountains was not built.
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| 49. | A special ventilation shaft was also installed.
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| 50. | The working shaft for the shelter at Oval now functions as a ventilation shaft for the station.
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