Select the application class used to assess velocity and friction suitability.
Enter the clear rectangular duct width and height in millimetres.
Maximum velocity and friction values used for the result assessment.
| Application | Velocity | Friction |
|---|---|---|
| Normal | 9 m/s | 0.85 Pa/m |
| Comfort | 5 m/s | 0.85 Pa/m |
| Kitchen hood | 7.5 m/s | - |
| Pressurization | 12 m/s | - |
| Smoke exhaust | 15 m/s | - |
Duct assessment
Copy the inputs, formulas and result step by step.
This calculator is provided for information only. Results must be checked by qualified engineers. The user is responsible for their application.