How should I store the HPA090 if I won't be using it for more than 30 days?
If the air purifier will not be used for more than 30 days, remove the True HEPA filters from the unit and wrap them in an airtight plastic bag. Also remove the Odor Reducing Pre-Filter and place it in a separate airtight plastic bag. (Page 4)
From the official Honeywell HPA090 Air Purifier manual, page 4
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