How often do I need to replace the filters?
The Pre-Filter and optional Enhanced Odor & VOC Filter should be replaced every 3 months, while the HEPA Filter should be replaced every 12 months. These are guidelines only — high concentrations of dust, pet dander, or smoke may reduce filter life and require more frequent replacement. (Page 7)
From the official Honeywell Hpa5100 Air Purifier manual, page 7
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