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It's not a HEPA filter, but it performs well for day-to-day allergen control, especially if you're looking for one of the best air filters for home environments with asthma concerns

Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health: Atlanta, GA

Worse still, they're now available online

Its extremely powerful and capable of delivering our recommended four ACH (air changes per hour) in spaces as large as 750 square feet on its highest setting though for noise reasons, you probably wouldnt want to run it that way all the time