My air purifier is making more noise and airflow seems weaker — what should I do?
The filters are likely dirty, as high amounts of particles can block filter pores and restrict airflow. Replace the HEPA Filters (every 12 months) and the Pre-Filter (every 3 months), using Genuine Honeywell Replacement Filters to ensure proper performance. (Page 8)
From the official Honeywell HPA250B Air Purifier manual, page 8
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