Duct Friction Loss: 18
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) |
|---|---|---|---|---|---|---|---|---|---|---|
| 18 | 600 | 1,060.29 | 0.4572 | 0.232017 | 0.018965 | 0.028419 | Darcy-Weisbach + Haaland | 92,705.4 | 0.00009 | 3.048 |
| 18 | 800 | 1,413.72 | 0.4572 | 0.393218 | 0.01808 | 0.048165 | Darcy-Weisbach + Haaland | 123,607.2 | 0.00009 | 4.064 |
| 18 | 1,000 | 1,767.15 | 0.4572 | 0.593766 | 0.017473 | 0.072729 | Darcy-Weisbach + Haaland | 154,509 | 0.00009 | 5.08 |
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