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20x20x4 Air Filters

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    • 20x20x4
      MERV 10

    • $59.96/Box of 6
      ($9.99/ea)

      • Glasfloss 20x20x4 Air Filter ZL Series
      • MERV 10 Air Filter
      • Glasfloss ZL Series
      • 20x20x4 (19-1/2 x 19-1/2 x 3-3/4)
      • Standard Allergen Removal
      • Up to 180 Day Filter
      • (More Information)
    • Add to Cart

    • 20x20x4
      MERV 11

    • $79.96/Box of 6
      ($13.33/ea)

      • Glasfloss 20x20x4 Air Filter MR-11 Series
      • MERV 11 Air Filter
      • Glasfloss MR-11 Series
      • 20x20x4 (19-1/2 x 19-1/2 x 3-3/4)
      • Superior Allergen Removal
      • Up to 180 Day Filter
      • (More Information)
    • Add to Cart

    • 20x20x4
      MERV 13

    • $178.01/Box of 6
      ($29.67/ea)

      • Glasfloss 20x20x4 Air Filter MR-13 Series
      • MERV 13 Air Filter
      • Glasfloss MR-13 Series
      • 20x20x4 (19-1/2 x 19-1/2 x 3-3/4)
      • Best Allergen Removal
      • Up to 180 Day Filter
      • (More Information)
    • Add to Cart

Which Air Filter is Best For Me?

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20x20x4 Air Filters