Whirlpool 1183054K (1183054) HEPA Filter Replacement for Whispure Air Purifier Models AP450 / AP510 / AP45030HO; Replaces Whirlpool Part # 1183054, 1183054K, 1183054K Large, 1183054K Premium HEPA Filter with extrememly high efficiency to capture particles as small as 0.3 microns including dust pollen & smoke Completely reduce allergic reactions and improve air quality in your home Easy to install. Can be used with carbon pre filter (sold separately) to remove odor for fresh air 100% customer satisfaction guarantee. Quality meets or exceeds leading national brands.