FAQ What is the Quick Clean mode? The Quick Clean mode on the KC-850U Air Cleaner uses high-density Plasmacluster ions to eliminate dust, pollen, mold, and allergens in just 5 minutes.Can I adjust the fan speed in Quick Clean mode? No, the fan speed cannot be adjusted while the Quick Clean mode is in operation. The fan speed is automatically adjusted based on the air quality.How do I turn off the Plasmacluster mode? You can turn off the Plasmacluster mode by pressing the Plasmacluster on/off button on the unit.