airshaft

noun3

1. •
   A vertical (or near vertical) opening (shaft) running from a courtyard to the sky, thus allowing air to circulate to high-rise apartments or offices.

   • There was a warren of big cabins instead, many levels opening onto walkways around a common airshaft. — 1987
2. •
   A passage supplying ventilation into a mine tunnel or other underground facility.
3. •
   A device used for handling winding reels in the processing of web-fed materials, such as in continuous-process printing presses.