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Air Filters: 4-inch Size

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  1. 20x25x4 3M Filtrete 4-inch Allergen Reduction Filter (1-Pack)

    3M Filtrete 20x25x4 Whole House Air Filter (4 inch, Allergen Reduction, 1-pack)

    Fits whole-house air cleaners that use 20x25x4 replacement filters - including Aprilaire, Space-Guard, Honeywell, and Trion Learn More
    $34.99 Retail Price:  $45.99 As low as: $34.99

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