open shaft

open shaft

A vertical duct or small enclosed passage within a building, open to the outer air at the top, and used to ventilate interior spaces connected to it. Also see light well.
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References in periodicals archive ?
Higgins also served as project geologist on landslide stabilization projects, highway rock slope excavation, roadway embankment work, roadway and railroad bridge projects, and tunneling, open shaft excavation and dewatering projects.
Mechatronic ropefree elevator system for vertical and horizontal transport with the possibility of movement of cabins in a closed or a partially open shaft, Patent Application nr P.
Owners of apartment buildings spend an average of $3,400 per year to heat air that rises to the roof and escapes from open shaft vents, which were originally intended to promote fire safety by drawing smoke out of the building through the roof.
To predict the quantity of smoke entering a shaft, Marshall (1986) developed an empirical equation based on the experiments in a 1/5 scale model of a fire compartment with a corridor and a 5-storey open shaft.
THE management company behind a Cardiff pub has been fined PS7,000 after a customer fell through an open shaft into the cellar.
To his horror, he realised that if the apparition had not diverted him he would have plunged down an open shaft to an almost certain death.
He stepped into the narrow open shaft in the expectation that the lift would be present for him to walk into, as it should have been.
He stepped into the narrow open shaft expecting the lift to be present for him to walk into.
The claims recite "a tower provided with means adjacent the lower end thereof for supporting it within a vertical open shaft of the structure being constructed.
Police and labour authorities have begun investigating the incident, which construction company officials say might have taken place when Mr Kumar slipped into the open shaft.
The seven-year-old called Kershi was out for a walk with his owner when he tumbled down the open shaft on wasteland near Bowesfield Industrial Estate, Stockton.
Lower Long Churn is a cave system which comes out half way down a large open shaft called Alum Pot 200 ft deep.