Rectangular Ducts - Hydraulic Diameter
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Hydraulic diameter for rectangular ducts can be calculated as
dh = 2 a b / (a + b) (1)
where
dh = hydraulic diameter (mm, in)
a = width of the duct (mm, in)
b = height of the duct (mm, in)
Hydraulic diameter of some common rectangular ducts:
| Width of Duct (mm) | Hydraulic Diameter - dh - (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Height of Duct (mm) | |||||||||||
| 100 | 150 | 200 | 250 | 300 | 400 | 500 | 600 | 800 | 1000 | 1200 | |
| 200 | 133 | 171 | 200 | ||||||||
| 250 | 143 | 188 | 122 | 250 | |||||||
| 300 | 150 | 200 | 222 | 273 | 300 | ||||||
| 400 | 160 | 218 | 240 | 308 | 343 | 400 | |||||
| 500 | 231 | 267 | 333 | 375 | 444 | 500 | |||||
| 600 | 240 | 286 | 353 | 400 | 480 | 545 | 600 | ||||
| 800 | 300 | 381 | 436 | 533 | 615 | 686 | 800 | ||||
| 1000 | 320 | 400 | 462 | 571 | 667 | 750 | 889 | 1000 | |||
| 1200 | 480 | 600 | 706 | 800 | 960 | 1091 | 1200 | ||||
| 1400 | 622 | 737 | 840 | 1018 | 1167 | 1292 | |||||
| 1600 | 640 | 762 | 873 | 1067 | 1231 | 1371 | |||||
| 1800 | 783 | 900 | 1108 | 1286 | 1440 | ||||||
| 2000 | 800 | 923 | 1143 | 1333 | 1500 | ||||||
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