OperationAir 6000 – 6721848696 (2022/11)50Fig. 54 Removing the plastic coverFig. 55 Inserting the filter and reattaching the back cover▶ Pull the back cover and remove it from the appliance.▶ Pull the filter from the appliance.▶ Remove the plastic cover of the air purification filter.▶ Insert the filter back into the appliance.▶ Reattach the back cover.4 Operation4.1 Understanding the air quality light ringThe light ring indicates the air quality. It lights up all colours in sequence,when the air purifier is switched on. After approximately 30 seconds, theparticle sensor selects the color that corresponds to the surrounding airquality of airborne particles, accordingly to table 2.PM2.5PM2.5 refers to ultra-fine airborne particle pollutants smaller than 2.5micrometers. Most of the indoor air pollutants fall under PM2.5 like:tobacco smoke, cooking and burning candles, some airborne bacteriaand the smallest mold spores, pet allergen and dust mite allergenparticles also fall under PM2.5.1.2.0010043092-0012.1.3.0010043094-001