Can I wash the Odor & VOC Reducing K Pre-filter?
No, the Odor & VOC Reducing K Pre-filter is not washable — washing it will destroy it. It should be replaced every 3 months at the same time you clean the ifD® Particle Filter for optimum odor and VOC reduction performance. (Pages 4–5)
From the official Honeywell HFD360 Air Purifier manual, page 4
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