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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.

  • 19x27x1 NaturalAire Standard MERV 8 84858.011927 (12 Filters)
    AAF Flanders

    19x27x1 NaturalAire Standard MERV 8

    $275.99
    $275.99
    Case of 12 $23.00/filter
  • 11-1/2x11-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8Up to $27.11 off
    AAF Flanders

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

    Only 1 left
    $118.88
    $118.88 $145.99
    Case of 12 $9.91/filter
  • 14x25x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x25x1 NaturalAire Healthy Ultra MERV 13

    $249.99
    $249.99
    Case of 12 $20.83/filter
  • 15x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    Up to $10.39 off
    AAF Flanders

    WAREHOUSE DEAL 15x20x1 NaturalAire Healthy Ultra MERV 13

    Only 1 left
    $149.99
    $149.99 $160.38
    Case of 11 $13.64/filter
  • 20x25x4-1/2 NaturalAire Choice Allergen MERV 8 82655.0452025 (2 Filters)
    MERV 8
    AAF Flanders

    20x25x4-1/2 NaturalAire Choice Allergen MERV 8

    $104.99
    $104.99
    Case of 2 $52.50/filter
  • 21x21x1 NaturalAire Standard MERV 8 84858.012121 (12 Filters)
    MERV 8
    AAF Flanders

    21x21x1 NaturalAire Standard MERV 8

    $175.99
    $175.99
    Case of 12 $14.67/filter
  • 17-5/8x35-5/8x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    17-5/8x35-5/8x1 NaturalAire Standard MERV 8

    $202.99
    $202.99
    Case of 12 $16.92/filter
  • NaturalAire Healthy Ultra MERV 13 (4 Filters)
    MERV 13
    AAF Flanders

    NaturalAire Healthy Ultra MERV 13

    $100.99
    $100.99
    Case of 4 $25.25/filter
  • 16x36x1 NaturalAire Standard MERV 8 84858.011636 (12 Filters)
    MERV 8
    AAF Flanders

    16x36x1 NaturalAire Standard MERV 8

    $176.99
    $176.99
    Case of 12 $14.75/filter
  • AAF Flanders PREpleat LPD MERV 10 High Capacity (12 Filters)
    MERV 10
    AAF Flanders

    PREpleat LPD MERV 10 High Capacity

    From $111.99
    From $111.99
    Case of 12 $9.33/filter
  • 22x22x1 NaturalAire Standard MERV 8 84858.012222 (12 Filters)
    MERV 8
    AAF Flanders

    22x22x1 NaturalAire Standard MERV 8

    $155.99
    $155.99
    Case of 12 $13.00/filter
  • 08x14x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    8x14x1 NaturalAire Standard MERV 8

    $219.99
    $219.99
    Case of 12 $18.33/filter
  • 12x24x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8Up to $20.11 offContact Support
    AAF Flanders

    WAREHOUSE DEAL 12x24x1 NaturalAire Standard MERV 8

    $79.88
    $79.88 $99.99
    Case of 12 $6.66/filter
  • 12x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    12x18x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $57.99
    $57.99
    Case of 4 $14.50/filter
  • 21x21x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    21x21x1 NaturalAire Healthy Ultra MERV 13

    $257.99
    $257.99
    Case of 12 $21.50/filter
  • 20x22x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    20x22x1 NaturalAire Standard MERV 8

    $179.99
    $179.99
    Case of 12 $15.00/filter
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