Blueair 203 GO SMOKESTOP Air Purifier For people living with allergies, asthma, or other respiratory conditions. High quality air purification HEPASilent technology, it captures 99.97% of the tiniest 0.1 micron particles on level 1. 3 Fan Speeds - Up to 141 CFM - Effective coverage area of up to 175 sq. ft Includes specialized SmokeStop filter