Whirlpool 1183051K True HEPA Filter (Small) - Design to Fit Whispure Air Purifier Model AP150 AP250, AP25030K, APR25130L, APR25530L, 10x11 inch New True HEPA Replacement Smaller Filter. Only for Air Purifier WhirlPool Model AP150 and AP250. Easy to install by simply snapping into place. Improves and maintain clean fresh air quality in the house. Removes and eliminates airborne particles or indoor air pollutants such as household dust, pet dander, Tobacco smoke, mold spores, plant pollen and fabric fibers. Filter reduces 99.97% airborne particles as small as 0.3 microns.