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Need a different depth?

Same size, deeper filter

Below is 17-1/2x23-1/2 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.

17-1/2x23-1/2x2 Built to order 17-1/2x23-1/2x4 Built to order

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

  • 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
  • 17-1/2x17-1/2x1 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
  • 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
  • 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
  • 21-1/2x23-1/2x1 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
  • 17-1/2x21x1 NaturalAire Odor Eliminator with Baking Soda MERV 8 air filter
    MERV 8
    AAF Flanders

    17-1/2x21x1 NaturalAire Odor Eliminator with Baking Soda MERV 8

    $97.99
    $97.99
    Case of 4 $24.50/filter
  • 16x25x1 NaturalAire Microparticle MERV 10 85156.011625 (12 Filters)
    MERV 10
    AAF Flanders

    16x25x1 NaturalAire Microparticle MERV 10

    $143.99
    $143.99
    Case of 12 $12.00/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
  • 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
  • 16x25x1 NaturalAire Microparticle MERV 10 85256.011625 (6 Filters)
    MERV 10
    AAF Flanders

    16x25x1 NaturalAire Microparticle MERV 10

    $74.99
    $74.99
    Case of 6 $12.50/filter
  • 17x21x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8Up to $49.11 offContact Support
    AAF Flanders

    WAREHOUSE DEAL 17x21x1 NaturalAire Standard MERV 8

    $104.88
    $104.88 $153.99
    Case of 12 $8.74/filter
  • 17x21x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    17x21x1 NaturalAire Standard MERV 8

    $168.99
    $168.99
    Case of 12 $14.08/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
  • 17x29x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    17x29x1 NaturalAire Healthy Ultra MERV 13

    $359.99
    $359.99
    Case of 12 $30.00/filter
  • 17x29x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    17x29x1 NaturalAire Microparticle MERV 10

    $120.99
    $120.99
    Case of 6 $20.17/filter
  • 20x20x1 NaturalAire Standard MERV 8 84858.012020 (12 Filters)
    MERV 8
    AAF Flanders

    20x20x1 NaturalAire Standard MERV 8

    $104.99
    $104.99
    Case of 12 $8.75/filter
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