I've had several different filters over the years including my Germguardians which I love too but this filter is so much better. Silence is subjective, but compared to my other filters, this filter is really quiet and very light. This works too, the automatic function increases and decreases the fan speed and can clean a large living/dining room in 2 hours. I vape at home, and after just two puffs the fan spins, clears the air, and then slows down again - very responsive. I will be replacing my Germgardians with other Airthereal filters. UPDATE 04/16/2019. I love and trust this filter so much it's not even funny. Allergy season has hit the south hard this year and my Airthereal filter was running at full capacity on its own as it sensed increased pollution in the home. He worked at full capacity for almost two days in a row to get rid of all the crap in the air. I stopped to check the filter and it was full of dirt so I vacuumed up the pollen and let it work again. Two days later, the surrounding debris cloud (our cars were yellow) dissipated and the filter returned to its normal quiet operation. Even at full blast it wasn't so loud that I felt like I should turn on the TV or something - you can also just set the fan to a slower speed in the evening and then turn it back to auto when you go to bed. . The design and performance are so superb that I will be replacing two Germgardian filters for my office and bedroom with two more of the same. I can't say enough about how well this amazing filter works. Eventually I will have to replace the filter myself, but so far the airflow is still very strong.
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