We've had air purifiers for decades. We have Trane's whole house "clean effects" as part of our air conditioning system, which does a good job downstairs and downstairs, but our master bedroom and upstairs bathroom seem to need a little help. So far the MA-40 seems to be doing a very good job of keeping the air fresh, reducing dust particles and being reasonably quiet. The device is set to "Auto" mode with "Ionization" enabled (my word). So far it has worked flawlessly. The sensors in the device work very well and the device also regularly "tests" the environment. Replacement filters were also ordered to be changed every six months and are very easy to install. Very happy with this system so far.
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