The two-thirds rule in air purification—often associated with sizing guidelines—suggests that an air purifier should be rated to cover a room size that is roughly one and a half times larger than your actual room dimensions, or that the Clean Air Delivery Rate should be high enough to exchange the total air volume of the space multiple times per hour. Specifically, selecting a unit with a CADR that equals at least two-thirds of the room's square footage in square feet of airflow ensures that the purifier can easily keep up with continuous indoor pollution sources without having to run constantly at maximum, noisy fan speeds. Proper sizing guarantees optimal air cleansing performance.
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