Contractors can only undertake the relevant classes or items of minor works for which they have been registered.
External Ventilation duct works or associated supporting frames located on grade or a roof
Erection/Alteration
Class I
1.47
Erection/Alteration
- Any metal ventilation duct or associated supporting frame is located on-grade/on a roof
- Distance between any part of the duct or frame and adjoining ground or roof
> 2.5m
Class II
2.47
Erection/Alteration
- Any metal ventilation duct or associated supporting frame is located on-grade/on a roof
- Distance between any part of the duct or frame and adjoining ground or roof
≤ 2.5m
Class III
3.47
Erection/Alteration
- Any metal ventilation duct or associated supporting frame is located on-grade/on a roof
- Distance between any part of the duct or frame and adjoining ground or roof
≤ 1.5m
Removal
Class I
1.5
Removal
- Any ventilation duct or associated supporting frame is located on or hung undernath the soffit of a cantilevered slab
- Span of the cantilever slab
≥ 1m
Class II
2.2
Removal
- Any ventilation duct or associated supporting frame is located on-grade/on a roof
- (If the roof is a cantilevered slab),
Span of the cantilevered slab
≤ 1m - Height of the duct or frame
Any
Class III
3.2
Removal
- Any ventilation duct or associated supporting frame is located on-grade/on a roof (other than a cantilevered slab)
- Not involve a cantilevered slab
- Height of the duct or frame
≤ 2m
External Ventilation duct works and associated supporting frames projecting from an external wall/fence wall on-grade, located on or hung underneath the soffit of a balcony/verandah/canopy
Erection/Alteration
Class I
1.47
Erection/Alteration
- Any metal ventilation duct or associated supporting frame is projecting from an external wall/fence wall on-grade
- Projecting from the wall
≤ 750mm
- Projecting from the wall
- Any metal ventilation duct or associated supporting frame is located on a balcony/verandah/canopy
- Largest cross-sectional dimension of the duct
≤ 750mm - Not involve a cantilevered slab
- Largest cross-sectional dimension of the duct
- Any metal ventilation duct or associated supporting frame is hung underneath the soffit of a balcony/verandah/canopy
- Largest cross-sectional dimension of the duct
≤ 750mm - Not involve a cantilevered slab
- Largest cross-sectional dimension of the duct
Class III
3.48
Erection/Alteration
- Any metal ventilation duct or associated supporting frame is projecting from an external wall
- Projecting from the wall
≤ 600mm - Distance between any part of duct or frame and the roof or ground > 3m
- Projecting from the wall
- Any metal ventilation duct or associated supporting frame is located on a balcony/verandah/canopy
- Largest cross-sectional dimension of the duct
≤ 600mm - Distance between any part of duct or frame and the roof or ground
> 3m - Distance between any part of duct or frame and the balcony, verandah or canopy
≤ 1.5m - Not involve a cantilevered slab
- Largest cross-sectional dimension of the duct
- Any metal ventilation duct or associated supporting frame is hung underneath the soffit of a balcony/verandah/canopy
- Largest cross-sectional dimension of the duct
≤ 600mm - Distance between any part of duct or frame and the roof or ground
> 3m - Not involve a cantilevered slab
- Largest cross-sectional dimension of the duct
Removal
Class I
1.5
Removal
- Any ventilation duct or associated supporting frame is located on or hung underneath the soffit of a cantilevered slab
- Span of the cantilevered slab
> 1m
Class II
2.2
Removal
- Any ventilation duct or associated supporting frame is located on or hung underneath the soffit of a balcony/verandah/canopy
- If the balcony/verandah/canopy is a cantilevered slab, span of the slab
≤ 1m
Class III
3.49
Removal
- Any ventilation duct or associated supporting frame is located on a balcony/verandah/canopy
- Distance between any part of duct or frame and the balcony, verandah or canopy
≤ 2m - Not involve a cantilevered slab
- Distance between any part of duct or frame and the balcony, verandah or canopy
- Any ventilation duct or associated supporting frame is hung underneath the soffit of a balcony/verandah/canopy
- Not involve a cantilevered slab
Class II
2.31
Removal
- Any ventilation duct or associated supporting frame is projecting from an external wall/fence wall on-grade
- Projecting from the wall
> 750mm
- Projecting from the wall
Class III
3.49
Removal
- Any ventilation duct or associated supporting frame is projecting from an external wall/fence wall on-grade
- Projecting from the wall
≤ 750mm
- Projecting from the wall