Most air purifiers come with two different filters: a prefilter and a HEPA filter. Some even have a third filter. Each manufacturer's recommendations will vary in terms of cleaning the filters.

The Winix 5500-2 Air Purifier features a True HEPA filter that captures 99.97% of airborne pollutants, dust mites, pet dander, pollen and other allergens as small as 0.3 microns. A four-stage ...

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