For Columns
| DN | Recommended Tube Size NB (mm) |
Minimum Structure Size Depth X Width |
| 80 100 150 225 300 400 450 600 |
25 25 25, 30 30 30 30 30, 40 40, 50 |
500 X 500 500 X 500 600 X 600 800 X 800 800 X 800 1000 X 1000 1000 X 1000 1200 X 1200 |
