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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.

  • 23.5x23.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    23-1/2x23-1/2x1 NaturalAire Microparticle MERV 10

    $273.99
    $273.99
    Case of 12 $22.83/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
  • 17.5x23.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    17-1/2x23-1/2x1 NaturalAire Microparticle MERV 10

    $259.99
    $259.99
    Case of 12 $21.67/filter
  • 21-1/2x23-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    21-1/2x23-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $122.99
    $122.99
    Case of 4 $30.75/filter
  • 23.5x23.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    23-1/2x23-1/2x1 NaturalAire Microparticle MERV 10

    $129.99
    $129.99
    Case of 6 $21.67/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
  • 29-1/2x19-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    Up to $162 off
    AAF Flanders

    WAREHOUSE DEAL 29-1/2x19-1/2x1 NaturalAire Standard MERV 8

    Only 1 left
    $114.99
    $114.99 $276.99
    Case of 12 $9.58/filter
  • 23-1/2x23-1/2x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    23-1/2x23-1/2x1 NaturalAire Healthy Ultra MERV 13

    $357.99
    $357.99
    Case of 12 $29.83/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
  • 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
  • 29-1/2x19-1/2x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    29-1/2x19-1/2x1 NaturalAire Standard MERV 8

    $283.99
    $283.99
    Case of 12 $23.67/filter
  • 17-1/2x29-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    17-1/2x29-1/2x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $69.99
    $69.99
    Case of 4 $17.50/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
  • 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
  • 11-1/2x11-1/2x1 Exact Filters Pleated MERV 11 (12 pack)
    MERV 11
    Exact Filters

    11-1/2x11-1/2x1 Pleated MERV 11

    $238.99
    $238.99
    Case of 12 $19.92/filter
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