Search

Need a different depth?

Same size, deeper filter

Below is 18x24 at 1 naturalaire″. A thicker filter holds more before it loads up, so it lasts longer between changes and puts less strain on the blower — we carry the same width and height in the depths below.

18x24x2 Shop this size 18x24x4 Shop this size

Ordering for a building? Ask for volume pricing or call 1-866-469-8556.

  • 20x25x5 NaturalAire Choice Allergen MERV 8 82655.052025 (2 Filters)
    MERV 8
    AAF Flanders

    20x25x5 NaturalAire Choice Allergen MERV 8

    $112.99
    $112.99
    Case of 2 $56.50/filter
  • 18x25x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    18x25x1 NaturalAire Healthy Ultra MERV 13

    $332.99
    $332.99
    Case of 12 $27.75/filter
  • 20x25x1 NaturalAire Standard MERV 8 84858.012025 (12 Filters)
    MERV 8
    AAF Flanders

    20x25x1 NaturalAire Standard MERV 8

    $106.99
    $106.99
    Case of 12 $8.92/filter
  • 24x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    24x24x1 NaturalAire Healthy Ultra MERV 13

    $261.99
    $261.99
    Case of 12 $21.83/filter
  • 20x20x1 NaturalAire Microparticle MERV 10 85256.012020 (6 Filters)
    MERV 10
    AAF Flanders

    20x20x1 NaturalAire Microparticle MERV 10

    $70.99
    $70.99
    Case of 6 $11.83/filter
  • 18x24x1 Flanders Nested Glass EZ-Green Filter 10059.011824 (24 Filters)
    Contact Support
    AAF Flanders

    18x24x1 Flanders Nested Glass EZ-Green Filter

    $114.99
    $114.99
    Case of 24 $4.79/filter
  • 16x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    16x24x1 NaturalAire Microparticle MERV 10

    $175.99
    $175.99
    Case of 12 $14.67/filter
  • 15x24x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    15x24x1 NaturalAire Standard MERV 8

    $169.99
    $169.99
    Case of 12 $14.17/filter
  • 24x24x1 NaturalAire Microparticle MERV 10 85156.012424 (12 Filters)
    MERV 10
    AAF Flanders

    24x24x1 NaturalAire Microparticle MERV 10

    $182.99
    $182.99
    Case of 12 $15.25/filter
  • 08x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13Up to $17.27 off
    AAF Flanders

    WAREHOUSE DEAL 8x24x1 NaturalAire Healthy Ultra MERV 13

    Only 1 left
    $34.99
    $34.99 $52.26
    Case of 3 $11.66/filter
  • 12x24x1 NaturalAire Standard MERV 8 84858.011224 (12 Filters)
    MERV 8
    AAF Flanders

    12x24x1 NaturalAire Standard MERV 8

    $99.99
    $99.99
    Case of 12 $8.33/filter
  • 08x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    8x24x1 NaturalAire Microparticle MERV 10

    $107.99
    $107.99
    Case of 6 $18.00/filter
  • 18x18x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x18x1 NaturalAire Microparticle MERV 10

    $261.99
    $261.99
    Case of 12 $21.83/filter
  • 12x24x1 NaturalAire Microparticle MERV 10 85156.011224 (12 Filters)
    MERV 10
    AAF Flanders

    12x24x1 NaturalAire Microparticle MERV 10

    $182.99
    $182.99
    Case of 12 $15.25/filter
  • 18x18x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x18x1 NaturalAire Microparticle MERV 10

    $114.99
    $114.99
    Case of 6 $19.17/filter
  • 14x18x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    14x18x1 NaturalAire Healthy Ultra MERV 13

    $297.99
    $297.99
    Case of 12 $24.83/filter
Show more