How do I use the Auto-Off Timer on the HPA5100?
Tap the Timer button to cycle through the three pre-set run times: 2, 4, or 8 hours, until the desired setting illuminates. To exit Timer mode, tap the button until the Timer light shuts off, and do not use this option if you want the air purifier to run continuously. (Page 7)
From the official Honeywell Hpa5100 Air Purifier manual, page 7
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