Replacement Pre-Filters For Whirlpool Whispure Air Cleaners - Compare to Whirlpool Part #8171434/1183063. Our hassle-free, Activated Charcoal Pre-Filters are ready-to-use with no measuring or cutting required. Each pre-filter will last for about 3 months depending upon the environment and are sold in a 2-Pack for a 6 month 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 AP35030H, AP45030H, AP51030L & AP51030S.
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