pipe shaft; riser shaft
Wasei-eigo term used in architecture and construction for a vertical shaft that houses plumbing, drainage, or other pipes in a building.
wasei-eigo (Japanese-coined English), from pipe space
In this apartment building, the water supply and drainage pipes are run together through the pipe shaft.
Variant with interpunct; less common in running text.
Wasei-eigo from English 'pipe' + 'space'.