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Source: https://discussions.apple.com/thread/253213554
There aren’t many settings to adjust on an air purifier. Most have low, medium and high fan speeds and possibly an auto-mode that detects impurities in the air and increases the fan speed on your behalf. Air circulates through a purifier faster at higher fan-speed settings so it cleans the air more efficiently. Higher speeds also make the air purifier louder. That means you typically want to find the balance between cleaning power and noise levels.