Adjust the fan speed of the clean booster.
Press the Booster Speed button during the Booster mode operation.
Each time you press the button, the speed changes in the following order:
Auto ~ Low ~ Middle ~ High ~ Turbo.
When you adjust the Booster Speed, the Booster Speed will be displayed on the status display panel. The Booster Speed increases by 2 columns each time the level is raised.
[Example of ‘Middle’ Display for Booster Speed]

When the Auto mode is selected, clean booster speed is automatically adjusted to the same level as Speed.