How long should I run my air purifier and can it run 24 hours a day?
The unit will be most effective when doors and windows are closed, and it is recommended that you run your air purifier while you are at home to help clean the air. If desired or conditions warrant, you may run your air purifier 24 hours a day.
From the official Honeywell HPA8350 Air Purifier manual, page 7
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