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Need a different depth?

Same size, deeper filter

Below is 18x36 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.

18x36x2 Built to order 18x36x4 Built to order

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

  • 18x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x36x1 NaturalAire Microparticle MERV 10

    $129.99
    $129.99
    Case of 6 $21.67/filter
  • 18x36x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    18x36x1 NaturalAire Healthy Ultra MERV 13

    $351.99
    $351.99
    Case of 12 $29.33/filter
  • 18x36x1 NaturalAire Standard MERV 8 84858.011836 (12 Filters)
    MERV 8
    AAF Flanders

    18x36x1 NaturalAire Standard MERV 8

    $193.99
    $193.99
    Case of 12 $16.17/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
  • 24x36x1 NaturalAire Permaire Washable Pad 40655.012436 (12 pack)
    Up to $16 off
    AAF Flanders

    24x36x1 NaturalAire Permaire Washable Pad

    $183.99
    $183.99 $199.99
    Case of 12 $15.33/filter
  • 18x30x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    18x30x1 NaturalAire Standard MERV 8

    $154.99
    $154.99
    Case of 12 $12.92/filter
  • 16x36x1 NaturalAire Standard MERV 8 84858.011636 (12 Filters)
    MERV 8
    AAF Flanders

    16x36x1 NaturalAire Standard MERV 8

    $176.99
    $176.99
    Case of 12 $14.75/filter
  • 24x36x1 NaturalAire Standard MERV 8 84858.012436 (12 Filters)
    MERV 8
    AAF Flanders

    24x36x1 NaturalAire Standard MERV 8

    $188.99
    $188.99
    Case of 12 $15.75/filter
  • 14x36x1 NaturalAire Standard MERV 8 84858.011436 (12 Filters)
    MERV 8
    AAF Flanders

    14x36x1 NaturalAire Standard MERV 8

    $167.99
    $167.99
    Case of 12 $14.00/filter
  • 18x30x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x30x1 NaturalAire Microparticle MERV 10

    $246.99
    $246.99
    Case of 12 $20.58/filter
  • 12x36x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    12x36x1 NaturalAire Healthy Ultra MERV 13

    $321.99
    $321.99
    Case of 12 $26.83/filter
  • 14x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    12x36x1 NaturalAire Microparticle MERV 10

    $187.99
    $187.99
    Case of 12 $15.67/filter
  • 24x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    24x36x1 NaturalAire Microparticle MERV 10

    $244.99
    $244.99
    Case of 6 $40.83/filter
  • 20x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x36x1 NaturalAire Microparticle MERV 10

    $160.99
    $160.99
    Case of 6 $26.83/filter
  • 12x36x1 NaturalAire Standard MERV 8 84858.011320 (12 Filters)
    MERV 8
    AAF Flanders

    12x36x1 NaturalAire Standard MERV 8

    $147.99
    $147.99
    Case of 12 $12.33/filter
  • 18x18x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    18x18x1 NaturalAire Microparticle MERV 10

    $261.99
    $261.99
    Case of 12 $21.83/filter
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