Aftermarket Whirlpool HEPA air purifier filter by Merchandise Mecca--QUALITY COMES FIRST!!!-- fits Whirlpool Whispure Air Purifier models AP450 and AP510 AP45030HO.  HEPA filtration helps remove airborne allergens such as dust, pet dander, pollen, tobacco smoke, fabric fibers and mold spores. Filter has rigid sides, not cardboard. Also includes 4 pre carbon filters. Guarantee Fit & Function.