Whirlpool 8171434K (8171434), 4-Pack (Large), Air Purifier Active Carbon Pre-Filters, Fits Air Purifier Model AP51030K, AP45030K, APR45130L, WP500, 18x16.5 inch Carbon-based filter designed to remove common household odors including smoke cooking odors and pet odors and VOCs For use with Whirlpool air purifier models AP51030K, AP45030K, APR45130L, APR45230L, AP51030KB Filter captures larger particles from the air, including pet hair and dander, extending the life of the HEPA filter Package contains 4 pre-filters, dimensions: 16 1/2" x 1/8" x 19 1/8" Improves and maintain clean fresh air quality in the house. Removes and eliminates airborne particles or indoor air pollutants such as household dust, Tobacco smoke, mold spores, plant pollen and fabric fibers.