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Need a different depth?

Same size, deeper filter

Below is 20x20 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.

20x20x2 Shop this size 20x20x4 Shop this size

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

  • 15x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    15x20x1 NaturalAire Microparticle MERV 10

    $167.99
    $167.99
    Case of 12 $14.00/filter
  • 14x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    14x20x1 NaturalAire Healthy Ultra MERV 13

    $230.99
    $230.99
    Case of 12 $19.25/filter
  • 16x20x1 NaturalAire Microparticle MERV 10 85156.011620 (12 Filters)
    MERV 10
    AAF Flanders

    16x20x1 NaturalAire Microparticle MERV 10

    $116.99
    $116.99
    Case of 12 $9.75/filter
  • 18x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    MERV 13
    AAF Flanders

    18x20x1 NaturalAire Healthy Ultra MERV 13

    $193.99
    $193.99
    Case of 12 $16.17/filter
  • 12x20x1 NaturalAire Standard MERV 8 84858.011220 (12 Filters)
    MERV 8
    AAF Flanders

    12x20x1 NaturalAire Standard MERV 8

    $95.99
    $95.99
    Case of 12 $8.00/filter
  • 20x30x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    WAREHOUSE DEAL 20x30x1 NaturalAire Microparticle MERV 10

    Only 1 left
    $124.88
    $124.88
    Case of 12 $10.41/filter
  • 20x24x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x24x1 NaturalAire Microparticle MERV 10

    $109.99
    $109.99
    Case of 6 $18.33/filter
  • 16x20x1 NaturalAire Microparticle MERV 10 85256.011620 (6 Filters)
    MERV 10
    AAF Flanders

    16x20x1 NaturalAire Microparticle MERV 10

    $69.99
    $69.99
    Case of 6 $11.67/filter
  • 15x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    15x20x1 NaturalAire Microparticle MERV 10

    $89.99
    $89.99
    Case of 6 $15.00/filter
  • WAREHOUSE DEAL 16x20x5 NaturalAire Choice Allergen MERV 8 (2 Filters)
    MERV 8Up to $55.11 off
    AAF Flanders

    WAREHOUSE DEAL 16x20x5 NaturalAire Choice Allergen MERV 8

    Only 1 left
    $149.88
    $149.88 $204.99
    Case of 2 $74.94/filter
  • 15x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    Up to $10.39 off
    AAF Flanders

    WAREHOUSE DEAL 15x20x1 NaturalAire Healthy Ultra MERV 13

    Only 1 left
    $149.99
    $149.99 $160.38
    Case of 11 $13.64/filter
  • 15x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    15x20x1 NaturalAire Healthy Ultra MERV 13

    $281.99
    $281.99
    Case of 12 $23.50/filter
  • 12x20x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    Up to $79.21 off
    AAF Flanders

    WAREHOUSE DEAL 12x20x1 NaturalAire Healthy Ultra MERV 13

    Only 1 left
    $129.99
    $129.99 $209.20
    Case of 10 $13.00/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
  • 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
  • 16x20x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10Up to $41.11 off
    AAF Flanders

    WAREHOUSE DEAL 16x20x1 NaturalAire Microparticle MERV 10

    Only 1 left
    $98.88
    $98.88 $139.99
    Case of 12 $8.24/filter
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