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.
A passage supplying ventilation into a mine tunnel or other underground facility.
A device used for handling winding reels in the processing of web-fed materials, such as in continuous-process printing presses.
A vertical structure, normally of brick, rising from a roof, containing one or more flues, each one terminating in a chimney pot.