How Duct Size Affects Airflow (CFM)
Size Matters
The size of your duct or hose plays a dramatic role in the performance of your dust collection. The chart below shows the theoretically possible CFM and our Dust Boot in red.
| Duct Diameter (IN) | Max CFM Possible |
| 1 | 22 |
| 2 | 87 |
| 3 | 196 |
| 4 | 349 |
| 5 | 545 🔴 |
| 6 | 785 |
| 7 | 1069 |
Other Tips
- Reductions - Only reduce the ducting from the maximum size of the port (at Dust Collector) once you reach your dust collection source (tool, spindle, etc).
- You can't size up, but you can size down.
- Limit the length of flexible ducting you use to a minimum. It increases turbulence which decreases the performance of your airflow.
- Shut off any unused tools with gates in your Dust Collection system.