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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.

  • PrimeShield Enhanced MERV 10 Pleated Air Filters (12 Pack)
    MERV 10
    RTF

    PrimeShield Enhanced MERV 10 Pleated Air Filters

    From $99.99
    From $99.99
    Case of 12 $8.33/filter
  • 24x30x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    24x30x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $113.99
    $113.99
    Case of 4 $28.50/filter
  • 20x22x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x22x1 NaturalAire Microparticle MERV 10

    $123.99
    $123.99
    Case of 6 $20.67/filter
  • 14x14x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x14x1 NaturalAire Healthy Ultra MERV 13

    $178.99
    $178.99
    Case of 12 $14.92/filter
  • Koch Multi-Pleat XL8 MERV 8 Standard Capacity (12 Filters)
    MERV 8
    Koch

    Multi-Pleat XL8 MERV 8 Standard Capacity

    From $103.99
    From $103.99
    Case of 12 $8.67/filter
  • 20x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    20x20x1 NaturalAire Healthy Ultra MERV 13

    $241.99
    $241.99
    Case of 12 $20.17/filter
  • 21x22x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    21x22x1 NaturalAire Healthy Ultra MERV 13

    $332.99
    $332.99
    Case of 12 $27.75/filter
  • 29-1/2x23-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    29-1/2x23-1/2x1 NaturalAire Standard MERV 8

    $306.99
    $306.99
    Case of 12 $25.58/filter
  • 23-1/2x23-1/2x1 NaturalAire Standard MERV 8 84858.01235235 (12 Filters)
    MERV 8
    AAF Flanders

    23-1/2x23-1/2x1 NaturalAire Standard MERV 8

    $146.99
    $146.99
    Case of 12 $12.25/filter
  • 10x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    10x20x1 NaturalAire Healthy Ultra MERV 13

    $218.99
    $218.99
    Case of 12 $18.25/filter
  • 24x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    24x36x1 NaturalAire Microparticle MERV 10

    $304.99
    $304.99
    Case of 12 $25.42/filter
  • 21-1/4x37-1/4x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    21-1/4x37-1/4x1 NaturalAire Standard MERV 8

    $297.99
    $297.99
    Case of 12 $24.83/filter
  • 11-1/2x11-1/2x1 NaturalAire Standard MERV 8 84858.01115115 (12 Filters)
    MERV 8
    AAF Flanders

    11-1/2x11-1/2x1 NaturalAire Standard MERV 8

    $159.99
    $159.99
    Case of 12 $13.33/filter
  • 20x36x1 NaturalAire Standard MERV 8 84858.012036 (12 Filters)
    MERV 8
    AAF Flanders

    20x36x1 NaturalAire Standard MERV 8

    $186.99
    $186.99
    Case of 12 $15.58/filter
  • 16x16x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    16x16x1 NaturalAire Standard MERV 8

    $138.99
    $138.99
    Case of 12 $11.58/filter
  • 16x20x1 NaturalAire Standard MERV 8 84858.011620 (12 Filters)
    MERV 8
    AAF Flanders

    16x20x1 NaturalAire Standard MERV 8

    $96.99
    $96.99
    Case of 12 $8.08/filter
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