Introduction: Clear the air and breathe more freely in medium or large rooms. The BY150 and BY350 have been proven to be used in a wide range of residential and light commercial applications, all around the world. The system comes with unique filtration technology that is efficient in removing tobacco smoke, dust, pollen, and mold spores, animal dander and general indoor air pollutants, and for killing bacteria. BY150: CADR 116 BY350: CADR 230 4 stages of air purification system Filter of 3M Company Indicator of filter replacement Noise: 45dB(Max) 4 speed Control Environment-Friendly Components ((RoHS) Lower Power Consumption