Duct Friction Loss: 4
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) |
|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 600 | 52.36 | 0.1016 | 1.499752 | 0.027243 | 0.183702 | Darcy-Weisbach + Haaland | 20,601.2 | 0.00009 | 3.048 |
| 4 | 800 | 69.81 | 0.1016 | 2.523457 | 0.025784 | 0.309094 | Darcy-Weisbach + Haaland | 27,468.3 | 0.00009 | 4.064 |
| 4 | 1,000 | 87.27 | 0.1016 | 3.792476 | 0.0248 | 0.464534 | Darcy-Weisbach + Haaland | 34,335.3 | 0.00009 | 5.08 |
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