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Maximum Duct and Pipe Sizes through Steel Joists, K-series
Joists and maximum size of ducts and pipes
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Maximum duct and pipe sizes through steel joists, K type:
| Joists Dept (in) |
Duct or Pipe Size | ||
| Round (in) |
Square (in) |
Rectangular (in) |
|
| 8 | 5 | 4 x 4 | 3 x 8 |
| 10 | 6 | 5 x 5 | 3 x 8 |
| 12 | 7 | 6 x 6 | 4 x 9 |
| 14 | 8 | 6 x 6 | 4 x 9 |
| 16 | 9 | 7 x 7 | 6 x 10 |
| 18 | 11 | 8 x 8 | 7 x 11 |
| 20 | 11 | 9 x 9 | 7 x 12 |
| 22 | 12 | 9 x 9 | 8 x 12 |
| 24 | 13 | 10 x 10 | 8 x 13 |
K series are common open web joists, standard sized for typical applications. K types span from 8’ to 60’ across with depths of 8” to 30”.
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