503SS It uses more activated carbon for better smoke and gas removal and captures 99.
The 503’s efficient SurroundAir™ vent system delivers exceptional air exchange (up to 450 cu. The 503 provides comparable performance for large-sized rooms. 97% of the tiniest 0. ft. to help control heavy gaseous pollutants like cigarette and cigar smoke. The NEW Blueair 503 w/SmokeStop Kit is recommended in rooms as large as 580 sq. 1 micron particles on Speed One, including allergy-provoking pollen, dust mites, mold spores, and pet dander. per min. This same performance and filter technology earned earlier BlueAir units Best of Class ranking in independent AHAM testing of Clean Air Delivery Rates. ft. ) without annoying drafts.