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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