How often should I replace the True HEPA filters and Pre-Filter?
The True HEPA filters should be replaced every 12 months, and the Odor Reducing Pre-Filter should be replaced every 3 months, especially if there have been heavy odors and particles in the home. Replacement intervals may vary depending on operating conditions and contaminant concentration.
From the official Honeywell HPA090 Air Purifier manual, page 3
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