ClueLumaVelocity for a target duct airflow calculator
Velocity for a target duct airflow
Divide target volume flow by free cross-sectional area to find the required mean velocity.
Units
Calculator
Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.
Worked example
Given
- = 1,800 cfm
- = 3 ft²
Given
- = 3,600 L/s
- = 1.8 m²
Symbols and units
| Symbol | Meaning | Unit |
|---|---|---|
| required mean duct velocity | ft/min | |
| target duct airflow | cfm | |
| free cross-sectional area | ft² |
| Symbol | Meaning | Unit |
|---|---|---|
| required mean duct velocity | m/s | |
| target duct airflow | L/s | |
| free cross-sectional area | m² |
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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.