Filter-Monster branded replacement compatible withAustin Air Bedroom Machine FR402 Air Purifier filter. Fits Austin Air models HM402, HM410, HM405, HM400, HM450. True HEPA 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 five (5) years under normal conditions, and more often under harsh air conditions. Package contains (1) HEPA filter, two (2) pre-filters. Approximate Dimensions - Diameter: 13.5", Inner Diameter: 7.25", Height: 14.5".
