Filter-Monster branded replacement compatible with Austin Air Healthmate Junior Plus FR250 Air Purifier filter. Fits Austin Air models HM250, HM200, HM205. Filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, mold spores and dust mites. Recommended to change filter once every 5 years under normal conditions, and more often under harsh air conditions. Package contains (1) filter, two (2) pre-filters. Approximate Dimensions - Diameter: 9.8", Inner Diameter: 5.5", Height: 11.50". Filter-Monster branded replacement filter compatible with Austin Air Healthmate Junior Plus FR250 Air Purifier filter. Package contains one (1) filter and two (2) carbon pre-filters. Engineered to fit Austin Air Healthmate Junior Plus (HM250) Air Purifier. Also fits Austin Air models HM200, HM205.