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A rough guide to maximum air volume capacity of circular ducts in comfort, industrial and high speed ventilation systems
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The values from the table below can be used to rough sizing of ducts in comfort, industrial and high speed ventilation systems.
| Maximum Air Volume Flow (m3/h) | ||||||||||
| Diameter
(mm) |
Area
(m2) |
Comfort systems | Industrial systems | High speed systems | ||||||
| Main ducts | Secondary ducts | Connecting ducts | Main ducts | Secondary ducts | Connecting ducts | Main ducts | Secondary ducts | Connecting ducts | ||
| Speed (m/s) | ||||||||||
| 5.5 | 4 | 2 | 10 | 6.5 | 4 | 14 | 9 | 6.5 | ||
| 63 | 0.003 | 62 | 45 | 22 | 112 | 73 | 45 | 157 | 101 | 73 |
| 80 | 0.005 | 99 | 72 | 36 | 181 | 118 | 72 | 253 | 163 | 118 |
| 100 | 0.008 | 155 | 113 | 57 | 283 | 184 | 113 | 396 | 254 | 184 |
| 125 | 0.012 | 243 | 177 | 88 | 442 | 287 | 177 | 618 | 397 | 287 |
| 160 | 0.020 | 398 | 289 | 145 | 723 | 470 | 289 | 1 013 | 651 | 470 |
| 200 | 0.031 | 622 | 452 | 226 | 1 130 | 735 | 452 | 1 583 | 1 017 | 735 |
| 250 | 0.049 | 971 | 707 | 353 | 1 766 | 1 148 | 707 | 2 473 | 1 590 | 1 148 |
| 315 | 0.078 | 1 542 | 1 122 | 561 | 2 804 | 1 823 | 1 122 | 3 926 | 2 524 | 1 823 |
| 400 | 0.126 | 2 487 | 1 809 | 904 | 4 522 | 2 939 | 1 809 | 6 330 | 4 069 | 2 939 |
| 500 | 0.196 | 3 886 | 2 826 | 1 413 | 7 065 | 4 592 | 2 826 | 9 891 | 6 359 | 4 592 |
| 630 | 0.312 | 6 169 | 4 487 | 2 243 | 11 216 | 7 291 | 4 487 | 15 703 | 10 095 | 7 291 |
| 800 | 0.502 | 9 948 | 7 235 | 3 617 | 18 086 | 11 756 | 7 235 | 25 321 | 16 278 | 11 756 |
| 1000 | 0.785 | 15 543 | 11 304 | 5 652 | 28 260 | 18 369 | 11 304 | 39 564 | 25 434 | 18 369 |
| 1250 | 1.227 | 24 286 | 17 663 | 8 831 | 44 156 | 28 702 | 17 663 | 61 819 | 39 741 | 28 702 |
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