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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.

  • 20x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    20x36x1 NaturalAire Microparticle MERV 10

    $289.99
    $289.99
    Case of 12 $24.17/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
  • 10x36x1 NaturalAire Standard MERV 8 84858.011036 (12 Filters)
    MERV 8
    AAF Flanders

    10x36x1 NaturalAire Standard MERV 8

    $150.99
    $150.99
    Case of 12 $12.58/filter
  • 24x36x1 NaturalAire Healthy Ultra MERV 13 Filters (12 pack)
    AAF Flanders

    24x36x1 NaturalAire Healthy Ultra MERV 13

    $409.99
    $409.99
    Case of 12 $34.17/filter
  • 24x36x1 NaturalAire Microparticle MERV 10 Filters (12 pack)
    MERV 10
    AAF Flanders

    24x36x1 NaturalAire Microparticle MERV 10

    $304.99
    $304.99
    Case of 12 $25.42/filter
  • Koch Disposable Fiberglass Panel Filter
    MERV 1-4
    Koch

    Disposable Fiberglass Panel Filter

    From $59.99
    From $59.99
  • 18x36x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter 10055.011836 (12 Filters)
    MERV 1-4
    AAF Flanders

    18x36x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter

    $138.99
    $138.99
    Case of 12 $11.58/filter
  • PrimeShield MAX Airflow MERV 1-4 Fiberglass Panel Basic Air Filters (12 Pack)
    MERV 1-4
    RTF

    PrimeShield MAX Airflow MERV 1-4 Fiberglass Panel Basic Air Filters

    From $57.99
    From $57.99
    Case of 12 $4.83/filter
  • 18x36x1 Exact Filters Pleated MERV 13 (12 pack)
    MERV 13
    Exact Filters

    18x36x1 Pleated MERV 13

    $533.99
    $533.99
    Case of 12 $44.50/filter
  • WAREHOUSE DEAL 18x36x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter (12 Filters)
    MERV 1-4Up to $47.11 offContact Support
    AAF Flanders

    WAREHOUSE DEAL 18x36x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter

    $79.88
    $79.88 $126.99
    Case of 12 $6.66/filter
  • Koch Disposable Polyester Panel Filter
    MERV 1-4
    Koch

    Disposable Polyester Panel Filter

    From $69.99
    From $69.99
  • 18x36x1 Exact Filters Pleated MERV 11 (12 pack)
    MERV 11
    Exact Filters

    18x36x1 Pleated MERV 11

    $521.99
    $521.99
    Case of 12 $43.50/filter
  • PrimeShield WashGuard Metal HVAC Air Filter - Washable & Reusable
    MERV 8
    RTF

    PrimeShield WashGuard Metal HVAC Air Filter - Washable & Reusable

    From $149.99
    From $149.99
  • 18x36x1 Koch Disposable Polyester Panel 284-180-360 (12 Filters)
    MERV 1-4
    Koch

    18x36x1 Disposable Polyester Panel Filter

    $108.99
    $108.99
    Case of 12 $9.08/filter
  • 18x36x1 Koch Disposable Fiberglass Panel 274-180-360 (12 Filters)
    MERV 1-4
    Koch

    18x36x1 Disposable Fiberglass Panel Filter

    $126.99
    $126.99
    Case of 12 $10.58/filter
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