How do I operate the HPA090 and select a cleaning level?

Once the filters are unwrapped and installed, ensure the control knob is in the OFF position and plug the unit into a working electrical outlet. Select the desired cleaning level by turning the knob to General Clean, Allergen, or Turbo. The Turbo setting operates at the highest speed and is best for quickly addressing specific air quality issues, while the Allergen setting helps reduce airborne allergens. (Page 3)