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Engineering ToolBox > Recommended Boiler Exhaust Velocity
| Exhaust Gas | Exhaust Velocity | |
| m/s | ft/s | |
| Ducts at minimum load | < 4.0 | < 13 |
| Stack at minimum load | < 5.0 | < 16 |
| Boiler with one-step burner (on - off) | 5.0 - 8.0 | 16 - 26 |
| Boiler with two-step burner (high - low) | 10 - 15 | 31 - 49 |
| Boiler with modulating burner | 15 - 25 | 49 - 82 |
| To keep the surface free from soot the velocity should exceed | 3.0 - 4.0 | 9.8 - 13 |