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• n  a shaft in a building; serves as an air passage for ventilation

News & Articles

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• Autopsies planned for boys, 5 and 7, apparently strangled by 15-foot snake
  Autopsies are planned Tuesday for two Canadian boys, aged 5 and 7, who were apparently killed during a sleepover when a 15-foot python escaped its cage in a pet store, slithered up through a ventilation shaft and strangled them.
  Aug. 6, 2013 - NBC NEWS