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Need a different depth?

Same size, deeper filter

Below is 23-1/2x23-1/2 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.

23-1/2x23-1/2x2 Built to order 23-1/2x23-1/2x4 Built to order

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

  • 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
  • 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
  • 23.5x23.5x1 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
  • 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
  • 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
  • 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
  • 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
  • 17-1/2x23-1/2x1 NaturalAire Standard MERV 8 84858.01175235 (12 Filters)
    AAF Flanders

    17-1/2x23-1/2x1 NaturalAire Standard MERV 8

    $156.99
    $156.99
    Case of 12 $13.08/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
  • 19-1/2x23x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    19-1/2x23x1 NaturalAire Standard MERV 8

    $266.99
    $266.99
    Case of 12 $22.25/filter
  • 17.5x23.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

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

    $124.99
    $124.99
    Case of 6 $20.83/filter
  • NaturalAire Standard MERV 8 (12 Filters)
    MERV 8
    AAF Flanders

    NaturalAire Standard MERV 8

    From $95.99
    From $95.99
    Case of 12 $8.00/filter
  • 17-1/2x23-1/2x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    17-1/2x23-1/2x1 NaturalAire Healthy Ultra MERV 13

    $201.99
    $201.99
    Case of 12 $16.83/filter
  • 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
  • 23x23x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    23x23x1 NaturalAire Standard MERV 8

    $192.99
    $192.99
    Case of 12 $16.08/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
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