Duct Friction Loss: 40
Duct friction loss data — pressure drop, velocity, and friction factors for round ducts at various diameters and airflows
| diameter in | velocity fpm | airflow cfm (cfm) | diameter m (m) | dp pa per m (Pa/m) | friction factor (dimensionless) | friction rate inwg per 100ft (inWG/100ft) | model | reynolds number (dimensionless) | roughness m (m) | velocity m s (m/s) |
|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 600 | 5,235.99 | 1.016 | 0.088243 | 0.016029 | 0.010809 | Darcy-Weisbach + Haaland | 206,012.1 | 0.00009 | 3.048 |
| 40 | 800 | 6,981.32 | 1.016 | 0.150002 | 0.015327 | 0.018373 | Darcy-Weisbach + Haaland | 274,682.8 | 0.00009 | 4.064 |
| 40 | 1,000 | 8,726.65 | 1.016 | 0.226953 | 0.014841 | 0.027799 | Darcy-Weisbach + Haaland | 343,353.4 | 0.00009 | 5.08 |
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