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Converting rectangular ducts to circular equivalents
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Rectangular ducts with side - a - and - b - can be converted to equivalent diameter - de - for major pressure loss calculations from the table below:
| Circular equivalent diameter - de (mm) | |||||||||||||||
|
Duct
side - a mm |
Duct side - b (mm) | ||||||||||||||
| 100 | 150 | 200 | 250 | 300 | 400 | 500 | 600 | 800 | 1000 | 1200 | 1400 | 1600 | 1800 | 2000 | |
| 100 | 110 | 134 | 153 | 170 | 185 | 210 | 231 | 250 | 283 | 311 | 335 | 357 | 377 | 396 | 414 |
| 150 | 134 | 165 | 190 | 211 | 230 | 263 | 290 | 315 | 357 | 393 | 424 | 453 | 479 | 503 | 525 |
| 200 | 153 | 190 | 219 | 245 | 268 | 307 | 340 | 369 | 420 | 463 | 500 | 534 | 565 | 594 | 621 |
| 250 | 170 | 211 | 245 | 274 | 300 | 345 | 383 | 417 | 475 | 525 | 568 | 607 | 643 | 676 | 707 |
| 300 | 185 | 230 | 268 | 300 | 329 | 379 | 422 | 460 | 525 | 581 | 629 | 673 | 713 | 751 | 785 |
| 400 | 210 | 263 | 307 | 345 | 379 | 439 | 490 | 535 | 613 | 680 | 738 | 791 | 839 | 884 | 925 |
| 500 | 231 | 290 | 340 | 383 | 422 | 490 | 548 | 600 | 690 | 767 | 834 | 895 | 950 | 1001 | 1049 |
| 600 | 250 | 315 | 369 | 417 | 460 | 535 | 600 | 658 | 758 | 844 | 920 | 988 | 1050 | 1108 | 1161 |
| 800 | 283 | 357 | 420 | 475 | 525 | 613 | 690 | 758 | 878 | 980 | 1070 | 1152 | 1226 | 1295 | 1360 |
| 1000 | 311 | 393 | 463 | 525 | 581 | 680 | 767 | 844 | 980 | 1097 | 1201 | 1294 | 1380 | 1459 | 1533 |
| 1200 | 335 | 424 | 500 | 568 | 629 | 738 | 834 | 920 | 1070 | 1201 | 1316 | 1421 | 1517 | 1606 | 1688 |
| 1400 | 357 | 453 | 534 | 607 | 673 | 791 | 895 | 988 | 1152 | 1294 | 1421 | 1536 | 1641 | 1739 | 1830 |
| 1600 | 377 | 479 | 565 | 643 | 713 | 839 | 950 | 1050 | 1226 | 1380 | 1517 | 1641 | 1755 | 1861 | 1960 |
| 1800 | 396 | 503 | 594 | 676 | 751 | 884 | 1001 | 1108 | 1295 | 1459 | 1606 | 1739 | 1861 | 1974 | 2081 |
| 2000 | 414 | 525 | 621 | 707 | 785 | 925 | 1049 | 1161 | 1360 | 1533 | 1688 | 1830 | 1960 | 2081 | 2194 |
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