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  1. 18 x 30 x 1 (17.7 x 29.7) Filtrete Allergen Defense 1000 Filter by 3M 4-Pack
    $97.00 Pack Of 4 Free Shipping
    • 1000 Performance Rating, MERV 11 Rating.
    • Up to 30 times more effective at capturing micro particles than ordinary fiberglass filters.
    • Meets the American Lung Association's Health House Project indoor air quality guidelines.
    • Outperforms all competitors' 3 month, 1" filters.
    • Captures:
      • Airborne micro particles, including smoke.
      • Airborne allergens, including pollen, pet dander, mold and bacteria.
      • Large particles like dust and lint.
    • Up to 3 months of filtering performance.
    • No unnecessary antimicrobial chemicals added. Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use.
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