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Shaft

NCC
means the walls and other parts of a building bounding—
  1. (a) a well, other than an atrium well ; or
  2. (b) a vertical chute, duct or similar passage, but not a chimney or flue.
Standards
the walls or other parts of a building bounding a well or a vertical chute, duct or similar passage
Shafts may be required to carry hot products of combustion under conditions of smoke exhaust operation.
Source - AS 1668.1:2015: The use of ventilation and air conditioning in buildings
HB50
<enclosure> continuous vertical enclosure in a building, including walls and other parts, which surround a well (but not an atrium well) or a vertical chute, duct or similar passage
A shaft excludes a chimney or flue. Regulatory authorities may require shafts to be of a nominated type of construction with a specified fire-resistance rating.
HB50
means the walls and other parts of a building bounding
  1. (a) a well, other than an atrium well; or
  2. (b) a vertical chute, duct or similar passage, but not a chimney or flue
Source - BCA Vol 1 terminology