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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.

  • 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
  • 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
  • 17.5x17.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    17-1/2x17-1/2x1 NaturalAire Microparticle MERV 10

    $101.99
    $101.99
    Case of 6 $17.00/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
  • 17.5x17.5x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    17-1/2x17-1/2x1 NaturalAire Microparticle MERV 10

    $229.99
    $229.99
    Case of 12 $19.17/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
  • 18x18x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13Up to $34.13 offContact Support
    AAF Flanders

    WAREHOUSE DEAL 18x18x1 NaturalAire Healthy Ultra MERV 13

    $129.99
    $129.99 $164.12
    Case of 11 $11.82/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
  • 23-1/2x23-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter 10055.01235235 (12 Filters)
    MERV 1-4
    AAF Flanders

    23-1/2x23-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter

    $102.99
    $102.99
    Case of 12 $8.58/filter
  • 23-1/2x23-1/2x1 Exact Filters Fiberglass MERV 1-4 (12 pack)
    MERV 1-4
    Exact Filters

    23-1/2x23-1/2x1 Fiberglass MERV 1-4

    $184.99
    $184.99
    Case of 12 $15.42/filter
  • 23-1/2x23-1/2x1 Exact Filters Pleated MERV 13 (12 pack)
    MERV 13
    Exact Filters

    23-1/2x23-1/2x1 Pleated MERV 13

    $285.99
    $285.99
    Case of 12 $23.83/filter
  • 23-1/2x23-1/2x1 Exact Filters Pleated MERV 11 (12 pack)
    MERV 11
    Exact Filters

    23-1/2x23-1/2x1 Pleated MERV 11

    $270.99
    $270.99
    Case of 12 $22.58/filter
  • 23-1/2x23-1/2x1 Exact Filters Pleated MERV 8 (12 pack)
    MERV 8
    Exact Filters

    23-1/2x23-1/2x1 Pleated MERV 8

    $222.99
    $222.99
    Case of 12 $18.58/filter
  • 17-1/2x23-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter 10055.01175235 (12 Filters)
    MERV 1-4
    AAF Flanders

    17-1/2x23-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter

    $96.99
    $96.99
    Case of 12 $8.08/filter
  • Filtrete™ Allergen Defense Filter (MPR 1000) — Front view
    MPR 1000
    Filtrete

    Allergen Defense Filter

    From $14.99
    From $14.99
  • 21-1/2x23-1/2x1 Exact Filters Pleated MERV 8 (12 pack)
    MERV 8
    Exact Filters

    21-1/2x23-1/2x1 Pleated MERV 8

    $222.99
    $222.99
    Case of 12 $18.58/filter
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