Austin Air B450B1 60 sq. ft. true HEPA medical filter medium - filter only needs replacing every 5 years. Meets HEPA standards, trapping 99.97% of all particulates larger than 0.3 microns. Nearly 15 lbs of solid activated carbon and zeolite for odor and gas removal. 3 Speeds - 400cfm on high setting: cleans a room area of up to 1500 ft. Color: Black