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Need a different depth?

Same size, deeper filter

Below is 13x20 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.

13x20x2 Built to order 13x20x4 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
  • 10x20x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    10x20x1 NaturalAire Standard MERV 8

    $98.99
    $98.99
    Case of 12 $8.25/filter
  • NaturalAire Healthy Ultra MERV 13 (4 Filters)
    MERV 13
    AAF Flanders

    NaturalAire Healthy Ultra MERV 13

    $100.99
    $100.99
    Case of 4 $25.25/filter
  • 20x22x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    20x22x1 NaturalAire Healthy Ultra MERV 13

    $329.99
    $329.99
    Case of 12 $27.50/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
  • 20x24x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    20x24x1 NaturalAire Healthy Ultra MERV 13

    $204.99
    $204.99
    Case of 12 $17.08/filter
  • 18x20x1 NaturalAire Standard MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    18x20x1 NaturalAire Standard MERV 8

    $105.99
    $105.99
    Case of 12 $8.83/filter
  • 14x25x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x25x1 NaturalAire Healthy Ultra MERV 13

    $249.99
    $249.99
    Case of 12 $20.83/filter
  • 20x36x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    20x36x1 NaturalAire Healthy Ultra MERV 13

    $370.99
    $370.99
    Case of 12 $30.92/filter
  • 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
  • 14x30x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x30x1 NaturalAire Healthy Ultra MERV 13

    $234.99
    $234.99
    Case of 12 $19.58/filter
  • 16x25x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    16x25x1 NaturalAire Healthy Ultra MERV 13

    $181.99
    $181.99
    Case of 12 $15.17/filter
  • 18x18x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    18x18x1 NaturalAire Healthy Ultra MERV 13

    $195.99
    $195.99
    Case of 12 $16.33/filter
  • 18x30x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    18x30x1 NaturalAire Healthy Ultra MERV 13

    $326.99
    $326.99
    Case of 12 $27.25/filter
  • 12x30x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    12x30x1 NaturalAire Healthy Ultra MERV 13

    $312.99
    $312.99
    Case of 12 $26.08/filter
  • 19x20x4 NaturalAire Choice Allergen MERV 8 82655.041920 (2 Filters)
    MERV 8
    AAF Flanders

    19x20x4 NaturalAire Choice Allergen MERV 8

    $136.99
    $136.99
    Case of 2 $68.50/filter
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