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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.

  • 14x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x24x1 NaturalAire Healthy Ultra MERV 13

    $248.99
    $248.99
    Case of 12 $20.75/filter
  • 15x24x3/8 NaturalAire Kwik Kut Fiberglass Filter KK600 (24 pack)
    MERV 1-4
    AAF Flanders

    15x24x3/8 NaturalAire Kwik Kut Fiberglass Filter KK600

    $124.99
    $124.99
    Case of 24 $5.21/filter
  • 18x36x1 NaturalAire Standard MERV 8 84858.011836 (12 Filters)
    MERV 8
    AAF Flanders

    18x36x1 NaturalAire Standard MERV 8

    $193.99
    $193.99
    Case of 12 $16.17/filter
  • 22x24x1 NaturalAire Standard MERV 8 84858.012224 (12 Filters)
    MERV 8
    AAF Flanders

    22x24x1 NaturalAire Standard MERV 8

    $175.99
    $175.99
    Case of 12 $14.67/filter
  • 20x24x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    20x24x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $102.99
    $102.99
    Case of 4 $25.75/filter
  • 14x24x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8Up to $17.11 offContact Support
    AAF Flanders

    WAREHOUSE DEAL 14x24x1 NaturalAire Standard MERV 8

    $79.88
    $79.88 $96.99
    Case of 12 $6.66/filter
  • 24x24x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    24x24x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $91.99
    $91.99
    Case of 4 $23.00/filter
  • 18x30x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    18x30x1 NaturalAire Healthy Ultra MERV 13

    $326.99
    $326.99
    Case of 12 $27.25/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
  • 18x25x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x25x1 NaturalAire Microparticle MERV 10

    $260.99
    $260.99
    Case of 12 $21.75/filter
  • 20x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    20x24x1 NaturalAire Healthy Ultra MERV 13

    $204.99
    $204.99
    Case of 12 $17.08/filter
  • 18x21x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    18x21x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $98.99
    $98.99
    Case of 4 $24.75/filter
  • 20x25x4-1/2 NaturalAire Optimum Allergen MERV 11 82755.052025 (2 Filters)
    MERV 11
    AAF Flanders

    20x25x4-1/2 NaturalAire Optimum Allergen MERV 11

    $145.99
    $145.99
    Case of 2 $73.00/filter
  • 10x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    10x24x1 NaturalAire Healthy Ultra MERV 13

    $226.99
    $226.99
    Case of 12 $18.92/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
  • 14x18x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    14x18x1 NaturalAire Standard MERV 8

    $248.99
    $248.99
    Case of 12 $20.75/filter
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