What's your most important consideration when it comes to t

What's your most important consideration when it comes to the quality of an air purifier?

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The noise it produces

Presence of High Efficiency Particulate Air (HEPA) filter

Size of air purifier fits room size (smaller ones won't filter as well for larger rooms)

That air purifier does not use ozone to clean the air (can affect lung health)

Others (please comment)

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The whole purpose of air purifier...must have good filter...