Air Purifiers

How is the performance of an air purifier measured? What is the CADR-to-Watt ratio?
Is there a difference between “room air purifiers” and “room air cleaners”?
What air purifier technologies do ENERGY STAR qualified room air purifiers use?
What is a HEPA filter? Does it have anything to do with the certification process of the ENERGY STAR qualified air purifiers?
What types of pollutants can an air purifier remove?

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