Compatible Replacement prefilter for Whirlpool APT40010R tower air purifier charcoal pre-filter. This filter helps reduce odors while trapping larger particles to help clean the air and to preserve the HEPA filter. Replace the pre-filter every 3 months. Comes in a pack of 4 filters. Part #817500.
Fits Whirlpool Whispure Tower Air Purifier Models APT30010M, APT40010R, APT42010M and APT50010M.
Approximate Dimensions: 20 1/2 x 4 3/4 x 1/8 inches