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Need a different depth?

Same size, deeper filter

Below is 11-1/2x11-1/2 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.

11-1/2x11-1/2x2 Built to order 11-1/2x11-1/2x4 Built to order

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

  • 18x30x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x30x1 NaturalAire Microparticle MERV 10

    $122.99
    $122.99
    Case of 6 $20.50/filter
  • 20x22x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    20x22x1 NaturalAire Healthy Ultra MERV 13

    $329.99
    $329.99
    Case of 12 $27.50/filter
  • 20x22-1/4x1 NaturalAire Standard MERV 8 84858.01202225 (12 Filters)
    MERV 8
    AAF Flanders

    20x22-1/4x1 NaturalAire Standard MERV 8

    $173.99
    $173.99
    Case of 12 $14.50/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
  • 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
  • 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
  • 18x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x20x1 NaturalAire Microparticle MERV 10

    $204.99
    $204.99
    Case of 12 $17.08/filter
  • 21x22x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    21x22x1 NaturalAire Microparticle MERV 10

    $257.99
    $257.99
    Case of 12 $21.50/filter
  • 14x22x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    14x22x1 NaturalAire Standard MERV 8

    $167.99
    $167.99
    Case of 12 $14.00/filter
  • 21x22x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    21x22x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $122.99
    $122.99
    Case of 4 $30.75/filter
  • 25x25x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    25x25x1 NaturalAire Healthy Ultra MERV 13

    $230.99
    $230.99
    Case of 12 $19.25/filter
  • 25x30x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    25x30x1 NaturalAire Healthy Ultra MERV 13

    $380.99
    $380.99
    Case of 12 $31.75/filter
  • Naturalaire MERV 13 custom size air filters
    MERV 13
    AAF Flanders

    Custom Size NaturalAire Healthy Ultra MERV 13 Air Filter

    $248.99
    $248.99
  • 17-1/2x17-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    17-1/2x17-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $69.99
    $69.99
    Case of 4 $17.50/filter
  • 17-1/2x23-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    17-1/2x23-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $69.99
    $69.99
    Case of 4 $17.50/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
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