Duct Friction Loss: 20
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) |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 600 | 1,309 | 0.508 | 0.20406 | 0.018534 | 0.024995 | Darcy-Weisbach + Haaland | 103,006 | 0.00009 | 3.048 |
| 20 | 800 | 1,745.33 | 0.508 | 0.345983 | 0.017676 | 0.042379 | Darcy-Weisbach + Haaland | 137,341.4 | 0.00009 | 4.064 |
| 20 | 1,000 | 2,181.66 | 0.508 | 0.522586 | 0.017087 | 0.064011 | Darcy-Weisbach + Haaland | 171,676.7 | 0.00009 | 5.08 |
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