Premium large True HEPA with a set of 4 activated carbon filter compatible with Whirlpool Whispure Air Purifier. Compared to Whirlpool part 1183054KCompatible model: AP51030K, AP45030K, WP500 series, WP1000 series, and APR45130LHigh quality HEPA filter captures 99.97% of airborne particles down to 0.3 microns. Activated carbon Pre-filter removes any unfavorable household odor and traps the dustSuggest replacing the filter every year the most to optimize the air purifier efficiency2 sets of filter included. Dimension approx. 15-3/4 x 18-7/8 x 2". Quality meets or exceeds leading national brand