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Designated Exempted Works

External metal ventilation ducts or associated supporting frame

Item details

Designated Exempted Works - 22
Designated Exempted Works item no. 22
Nature of works Erection/Alteration/Removal of any external metal ventilation duct, or associated supporting frame, on-grade or on a roof of a building
Result in any additional load to any cantilevered slab No
The distance between the highest point of the duct or frame and the adjoining ground or adjoining roof Not more than 900mm
If there is no protective barrier of a height of not less than 1.1 m at any edge of the roof, the distance between any part of the duct or frame and that edge More than 1.5m
Designated Exempted Works - 23
Designated Exempted Works item no. 23
Nature of works Erection/Alteration/Removal of any external metal ventilation duct or associated supporting frame
Location of the external metal ventilation duct or associated supporting frame
  1. Projects from an external wall of a building
  2. Located on a balcony/verandah/canopy (other than a cantilevered slab) of a building
  3. Hung underneath the soffit of a balcony/verandah/canopy (other than a cantilevered slab) of a building
Result in any additional load to any cantilevered slab No
If the duct or frame projects from the external wall of a building, projection from the wall Not more than 750mm
If the duct or frame is located on a balcony, verandah or canopy (other than a cantilevered slab)
  1. the largest cross-sectional dimension of the duct or frame is not more than 750mm
  2. the distance between the highest point of the duct or frame and the balcony, verandah or canopy is not more than 900mm
If the duct or frame is hung underneath the soffit of a balcony, verandah or canopy (other than a cantilevered slab), the largest cross-sectional dimension of the duct or frame Not more than 750mm
The distance between the highest point of the duct or frame and the roof or ground Not more than 3m
For erection or alteration works-the balcony, verandah or canopy projects over any street or common part of the building. No
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