Thickness of Ducts
Thickness of Rectangular Ducts
| Longest Side |
|
Thickness |
| mm |
in |
Up to 1000 pa |
1001 pa to 2000 pa |
| 400 |
15 |
0.6 |
0.8 |
| 600 |
24 |
0.8 |
0.8 |
| 800 |
32 |
0.8 |
0.8 |
| 1000 |
40 |
0.8 |
0.8 |
| 1250 |
48 |
1.0 |
1.0 |
| 1600 |
63 |
1.0 |
1.0 |
| 2000 |
78 |
1.0 |
1.2 |
| 2500 |
96 |
1.0 |
1.2 |
| 3000 |
118 |
1.2 |
— |
Thickness of Circular Ducts
| Circular diameter |
|
Thickness |
| mm |
in |
Spirally wound up to 2000 pa |
Straight seamed up to 1000 pa |
1001 pa to 2000 pa |
| 80 |
3 |
0.4 |
0.6 |
0.8 |
| 160 |
6 |
0.5 |
0.6 |
0.8 |
| 200 |
8 |
0.5 |
0.6 |
0.8 |
| 315 |
12 |
0.6 |
0.6 |
0.8 |
| 500 |
20 |
0.6 |
0.8 |
0.8 |
| 800 |
32 |
0.8 |
0.8 |
1.0 |
| 1000 |
40 |
1.0 |
1.0 |
1.2 |
| 1500 |
60 |
1.2 |
1.2 |
1.2 |
Ducts outside buildings exposed to atmosphere should be 0.2 mm thicker.
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