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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.

  • 12x18x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    12x18x1 NaturalAire Healthy Ultra MERV 13

    $277.99
    $277.99
    Case of 12 $23.17/filter
  • 18x30x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x30x1 NaturalAire Microparticle MERV 10

    $246.99
    $246.99
    Case of 12 $20.58/filter
  • 16x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    16x24x1 NaturalAire Healthy Ultra MERV 13

    $203.99
    $203.99
    Case of 12 $17.00/filter
  • Flanders AAF Pleated Filter Naturalaire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    NaturalAire Standard MERV 8

    $81.99
    $81.99
    Case of 6 $13.67/filter
  • 10x24x1 NaturalAire Standard MERV 8 84858.011024 (12 Filters)
    MERV 8
    AAF Flanders

    10x24x1 NaturalAire Standard MERV 8

    $165.99
    $165.99
    Case of 12 $13.83/filter
  • 18x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    18x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $69.99
    $69.99
    Case of 4 $17.50/filter
  • 21-1/2x23-1/2x1 NaturalAire Standard MERV 8 84858.01215235 (12 Filters)
    MERV 8
    AAF Flanders

    21-1/2x23-1/2x1 NaturalAire Standard MERV 8

    $183.99
    $183.99
    Case of 12 $15.33/filter
  • 19-1/2x23x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    19-1/2x23x1 NaturalAire Standard MERV 8

    $266.99
    $266.99
    Case of 12 $22.25/filter
  • 12x24x1 NaturalAire Healthy Ultra MERV 13 95003.011224 (12 Filters)
    MERV 13
    AAF Flanders

    12x24x1 NaturalAire Healthy Ultra MERV 13

    $174.99
    $174.99
    Case of 12 $14.58/filter
  • 18x25x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x25x1 NaturalAire Microparticle MERV 10

    $127.99
    $127.99
    Case of 6 $21.33/filter
  • 10x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    10x24x1 NaturalAire Microparticle MERV 10

    $242.99
    $242.99
    Case of 12 $20.25/filter
  • 14x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    14x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $62.99
    $62.99
    Case of 4 $15.75/filter
  • 20x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x24x1 NaturalAire Microparticle MERV 10

    $109.99
    $109.99
    Case of 6 $18.33/filter
  • 10x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    10x24x1 NaturalAire Microparticle MERV 10

    $121.99
    $121.99
    Case of 6 $20.33/filter
  • 20x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x24x1 NaturalAire Microparticle MERV 10

    $199.99
    $199.99
    Case of 12 $16.67/filter
  • 12x18x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    12x18x1 NaturalAire Microparticle MERV 10

    $118.99
    $118.99
    Case of 6 $19.83/filter
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