When the purifier runs, it clears the area immediately around itself. Over time, dusty air seeps back in and it kicks back on. Unfortunately, if the area around the machine is not clean, when it runs it can kick up more particles. If things like carpets are trapping dust, the purifier may never be able to clean the air and will keep turning on and off, kicking up dust, and running again. Often times there is no advantage of running these devices.
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