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Need a different depth?

Same size, deeper filter

Below is 12x25 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.

12x25x2 Shop this size 12x25x4 Built to order

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

  • 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
  • 20x25x6 NaturalAire Choice Allergen MERV 8 82655.062025 (3 Filters)
    MERV 8Contact Support
    AAF Flanders

    20x25x6 NaturalAire Choice Allergen MERV 8

    $190.99
    $190.99
    Case of 3 $63.66/filter
  • 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
  • 12x36x1 NaturalAire Standard MERV 8 84858.011320 (12 Filters)
    MERV 8
    AAF Flanders

    12x36x1 NaturalAire Standard MERV 8

    $147.99
    $147.99
    Case of 12 $12.33/filter
  • 12x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    12x20x1 NaturalAire Healthy Ultra MERV 13

    $268.99
    $268.99
    Case of 12 $22.42/filter
  • 12x18x1 NaturalAire Standard MERV 8 84858.011218 (12 Filters)
    AAF Flanders

    12x18x1 NaturalAire Standard MERV 8

    $132.99
    $132.99
    Case of 12 $11.08/filter
  • 17-1/2x26-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    17-1/2x26-1/2x1 NaturalAire Standard MERV 8

    $270.99
    $270.99
    Case of 12 $22.58/filter
  • 21-1/2x24x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    21-1/2x24x1 NaturalAire Standard MERV 8

    $180.99
    $180.99
    Case of 12 $15.08/filter
  • 12x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    Up to $79.21 off
    AAF Flanders

    WAREHOUSE DEAL 12x20x1 NaturalAire Healthy Ultra MERV 13

    Only 1 left
    $129.99
    $129.99 $209.20
    Case of 10 $13.00/filter
  • 16x25x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    16x25x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $62.99
    $62.99
    Case of 4 $15.75/filter
  • 12x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    12x20x1 NaturalAire Microparticle MERV 10

    $109.99
    $109.99
    Case of 12 $9.17/filter
  • 23-1/2x21-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    23-1/2x21-1/2x1 NaturalAire Standard MERV 8

    $200.99
    $200.99
    Case of 12 $16.75/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
  • 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
  • 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
  • 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
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