How long should I run my air purifier daily?
In general, the unit will be most effective when doors and windows are closed. 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. (Page 9)
From the official Honeywell Hpa5100 Air Purifier manual, page 9
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