Noun
A passage, usually vertical, for admitting fresh air into a mine or a tunnel.
Source: Webster's dictionaryThe two engage in a lightsaber duel that leads them over the city's central air shaft where, as his mentors warned, Luke proves to be no match for Vader who severs Luke's right hand, causing him to lose his weapon. Source: Internet
Horrified, Luke falls through the air shaft. Source: Internet