Product Detail 30 sq. ft. true HEPA medical filter medium. Prefilter included on outside of main filter. 6.5 lbs of solid activated carbon and zeolite for odor and gas removal. Easy replacement of existing filter. . The "Austin Air Healthmate Plus Jr Replacement Filter w/ Prefilter - White" is best product for you. We recommended Austin Air Healthmate Plus Jr Replacement Filter w/ Prefilter - White