The TOSOT True HEPA Air Purifier with UV Light focuses on bringing clean, comfortable, and safe air to your family. It removes 99.97% of airborne particles of 0.1 microns or larger. This purifier eliminates bacteria, viruses, mold, and other nasty things in the air by activating the UV light. With a CADR of 200 CFM, it is perfect for removing wildfire smoke and dust particles in spaces of up to 450 sq. ft. This purifier will automatically adjust to the optimal fan speed based on the air quality level near the machine on auto mode. Once the air quality improves, the fan speed will slow down to a more quiet level.