Duct Friction Loss: 12
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) |
|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 600 | 471.24 | 0.3048 | 0.38128 | 0.020778 | 0.046702 | Darcy-Weisbach + Haaland | 61,803.6 | 0.00009 | 3.048 |
| 12 | 800 | 628.32 | 0.3048 | 0.645078 | 0.019774 | 0.079015 | Darcy-Weisbach + Haaland | 82,404.8 | 0.00009 | 4.064 |
| 12 | 1,000 | 785.4 | 0.3048 | 0.97298 | 0.019088 | 0.119179 | Darcy-Weisbach + Haaland | 103,006 | 0.00009 | 5.08 |
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