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the sensors seem to work very well - opening the front or back door, the dog walking past it, cooking smoke or odor - so i leave it on auto most of the time.
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what's more, even though the unit is in my bedroom (i always keep the door open), i can tell that it's working in the rest of my house as well.
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for the first few days, every time i opened my office door and let in outside air, the sensor would turn orange or red and then gradually move back down to green as the unit cleaned the air.
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i have been in my room (closed door) for over a hour and the air purifier has sped up several times, on the auto setting, due to the hyperactive odor sensor.
Positives:
Quiet Low Speed Operation, Quiet Operation, Powerful Odor Control, 600 Sq. Ft.