Product Detail Excellent air purifier for general particle filtration and gas and odor removal. SurroundAir system delivers exceptional air exchange without annoying drafts, HEPASilent technology, it captures 99.97% of the tiniest 0.1 micron particles on level 1. 4 Fan Speeds - Up to 240 CFM - Effective coverage area of up to 365 sq. ft. . The "Blueair 402 HEPASilent Air Purifier" is best product for you. We recommended Blueair 402 HEPASilent Air Purifier