My air purifier is making more noise and the airflow seems reduced — what should I do?
The filters are likely dirty, as high amounts of contaminants can block the filter pores and restrict airflow. Replace the HEPA filters (every 12 months) and the Pre-filter (every 3 months), using only Genuine Honeywell replacement filters to ensure proper performance. (Page 7)
From the official Honeywell HPA8350 Air Purifier manual, page 7
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