Search

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.

  • 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
  • 15x20x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    15x20x1 NaturalAire Standard MERV 8

    $96.99
    $96.99
    Case of 12 $8.08/filter
  • 16x16x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    16x16x1 NaturalAire Microparticle MERV 10

    $240.99
    $240.99
    Case of 12 $20.08/filter
  • 12x18x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    12x18x1 NaturalAire Healthy Ultra MERV 13

    $277.99
    $277.99
    Case of 12 $23.17/filter
  • 20x25x1 NaturalAire Microparticle MERV 10 85256.012025 (6 Filters)
    MERV 10
    AAF Flanders

    20x25x1 NaturalAire Microparticle MERV 10

    $77.99
    $77.99
    Case of 6 $13.00/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
  • 20x22x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10Up to $20.01 off
    AAF Flanders

    WAREHOUSE DEAL 20x22x1 NaturalAire Microparticle MERV 10

    Only 1 left
    $119.99
    $119.99 $140.00
    Case of 7 $17.14/filter
  • 18x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x20x1 NaturalAire Microparticle MERV 10

    $93.99
    $93.99
    Case of 6 $15.67/filter
  • 10x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    10x20x1 NaturalAire Healthy Ultra MERV 13

    $218.99
    $218.99
    Case of 12 $18.25/filter
  • 14x20x1 NaturalAire Microparticle MERV 10 85256.011420 (6 Filters)
    MERV 10
    AAF Flanders

    14x20x1 NaturalAire Microparticle MERV 10

    $89.99
    $89.99
    Case of 6 $15.00/filter
  • 21-1/4x37-1/4x1 NaturalAire Standard MERV 8 Filters (12 pack)
    AAF Flanders

    21-1/4x37-1/4x1 NaturalAire Standard MERV 8

    $297.99
    $297.99
    Case of 12 $24.83/filter
  • 12x24x1 NaturalAire Microparticle MERV 10 85156.011224 (12 Filters)
    MERV 10
    AAF Flanders

    12x24x1 NaturalAire Microparticle MERV 10

    $182.99
    $182.99
    Case of 12 $15.25/filter
  • 12x27x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    12x27x1 NaturalAire Standard MERV 8

    $149.99
    $149.99
    Case of 12 $12.50/filter
  • 22x22x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    22x22x1 NaturalAire Microparticle MERV 10

    $107.99
    $107.99
    Case of 6 $18.00/filter
  • 12x25x1 NaturalAire Standard MERV 8 84858.011225 (12 Filters)
    MERV 8
    AAF Flanders

    12x25x1 NaturalAire Standard MERV 8

    $149.99
    $149.99
    Case of 12 $12.50/filter
  • 22x22x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    22x22x1 NaturalAire Healthy Ultra MERV 13

    $213.99
    $213.99
    Case of 12 $17.83/filter
Show more