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Compatibility: Compatible with Whirlpool 1183054K air filter. Fits most Whirlpool brand air purifiers including models AP51030K, AP51030KB, APR45130L, and APR45230L. | Air Quality Improvement: True HEPA filtration is rated H13 and removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, and more. | Maintenance: Recommended to change this filter once every twelve (12) months under normal conditions, and more often under harsh air conditions. | Replacement Quantity: Each package contains one (1) replacement filter. | Approximate Measurements: Each filter measures 15 3/4 x 18 7/8 x 2 inches.