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Furnace Air Filters: 1-inch Size

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  1. 18x30x1 3M Filtrete Micro Allergen Filter (1-Pack)

    18x30x1 3M Filtrete Micro Allergen Filter (1-Pack)

    Fits heating / air-conditioning systems that use 1-inch replacement filters Learn More
    $24.79 Retail Price:  $30.99
  2. 18x30x1 3M Filtrete Ultra Allergen Filter (1-Pack)

    18x30x1 3M Filtrete Ultra Allergen Filter (1-Pack)

    Fits heating / air-conditioning systems that use 1-inch replacement filters Learn More
    $37.69 Retail Price:  $45.99

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