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For with Whirlpool air purifier models AP300, AP350, AP450 and AP510
Filter captures 99.7-Percent of particles as small as 0.3 microns
Helps remove common household odors, including smoke cooking odors and pet odors
Helps filter dust, pollen and smoke
Genuine Replacement Pre-Filters For Whirlpool Whispure Air Cleaners - Whirlpool Part #8171434. Ready-to-use right out of
the box, each pre-filter will last for about 3 months depending upon the environment and are sold in a 4-Pack for a
year's supply. One way to tell it is time to replace them is by the color. They are almost black to begin with and turn
a light gray color when they need to be changed. Fits Models AP350, AP450 and AP510.