Item details
| 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 |
More details: See Item 22 Description of building works, Schedule 2 - Part 2, Building (Minor Works) Regulation
| 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 |
|
| 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) |
|
| 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 |
More details: See Item 23 Description of building works, Schedule 2 - Part 2, Building (Minor Works) Regulation