An air purifier typically takes between 15 and 30 minutes to noticeably cleanse the air in a properly sized room, assuming the unit is running on a medium or high fan speed. The exact purification duration depends on the Clean Air Delivery Rate of the purifier, the physical square footage of the room, and the initial concentration of airborne pollutants. Most high-performance air purifiers are engineered to completely exchange and filter the entire volume of air in a rated space roughly four to five times every hour. Running the unit continuously ensures that air purity remains consistently high rather than waiting for it to cycle after pollution accumulates.
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