78.2 OZONE CONTROL.The ozone control can turn on, turn off or adjust ozone function without degrees. Keeping in mind the previous statement, adjust the purifier so that the odorof ozone fades into the environment after 15-30 seconds. To reduce mold, mildew, and bacteria, turn the unit on high settings for 3-4hours to let air circulate out from room by opening doors or windows. The POWER light turns to GREEN color when the “Fan” switch turned on,the OZONE light turns to RED when the “Ozone” switch turned on. Ozoneswitch is suggested to be switch on only in unoccupied spaces. Do not look at front panel in short distance in case the UV light will bad foryour eyes.Always be sure a room or area UNOCCUPIED beforeperforming the above described Ozone control9. MAINTENANCEPeriodic maintenance is required to insure that the air purifier operates properly. Aseverely polluted environment can foul a air purifier plate as little as four weeks oras long as a year. Shown here are basic maintenance procedures that should becarried out to keep your unit running at top performance.Pre-filter / HEPA filter cleaning (see page 5 for removal instructions):You have two options to clean the pre-filter, and HEPA filter:• When visibly dirty, simply remove the pre-filter or HEPA filter and remove theheavy particulate from the screen with a hand-held vacuum. This method willextend the life of the screen / filter.• When visibly dirty, remove the pre-filter and HEPA filter from the unit and wash itin cool water, brush it gently with a toothbrush to remove particulate. Drycompletely prior to re-installing the lint screen.Remove the back cover (page 5). Carefully remove each filter. Clean the filter withcool water and ammonia. Dry completely prior to re-installing the filter (page 5).10. Fan Blade and Front Grill(take off front/reinstall grill method:)As left picture shows, hold bottom of front grill and pullout, when latch take off front panel, turn over front gillup about 30 degree.