Product Detail 60 sq. ft. true HEPA medical filter medium. Prefilter included on outside of main filter. Nearly 15 lbs of solid activated carbon and zeolite for odor and gas removal. Easy replacement of existing filter. Light-colored . The "Austin Air Healthmate Replacement Filter w/ Prefilter Light-colored" is best product for you. We recommended Austin Air Healthmate Replacement Filter w/ Prefilter Light-colored