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Alen brand air purifiers can run for up to 12 consecutive hours; after this, a built-in timer turns the machine off. You can keep the appliance running all day by manually restarting the purifier after each 12-hour cycle ends.
Source:
Alen Air Purifier User Manual (PDF)
MyAirCleaners.com: Alen A350 Air Cleaner
Allergy Buyers Club: Alen T300 HEPA Tower Air Purifiers
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