Replacement 19-1-2x21-1-2x1 air filters for homes, offices, and commercial HVAC systems. This collection covers every MERV rating we stock: fiberglass MERV 1–4, pleated MERV 8, MERV 10, MERV 11, and hospital-grade MERV 13.

20+ years in filtration 4.8 from 1,000+ reviews

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  • 19-1/2x21-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter 10055.01195215 (new sku 10055.01499) (12 Filters)
    MERV 1-4
    AAF Flanders

    19-1/2x21-1/2x1 Flanders EZ Flow Fiberglass MERV 1-4 Filter (new sku 10055.01499)

    $184.99
    $184.99
    Case of 12 $15.42/filter
  • 19-1/2x21-1/2x1 (19.5x21.5x0.75) Exact Filters Pleated MERV 10 (12 pack)
    MERV 10
    Exact Filters

    19-1/2x21-1/2x1 (19.5x21.5x0.75) Pleated MERV 10

    $211.99
    $211.99
    Case of 12 $17.67/filter
  • Custom filters
    Built to your exact size

    Any size, cut to 1/8″. Depth 1″–6″ · MERV 1–13.

    Build your filter
  • 19-1/2x21-1/2x1 (19.5x21.5x0.75) Exact Filters Pleated MERV 13 (12 pack)
    MERV 13
    Exact Filters

    19-1/2x21-1/2x1 (19.5x21.5x0.75) Pleated MERV 13

    $279.99
    $279.99
    Case of 12 $23.33/filter
  • 19-1/2x21-1/2x1 (19.5x21.5x0.75) Exact Filters Fiberglass MERV 1-4 (12 pack)
    MERV 1-4
    Exact Filters

    19-1/2x21-1/2x1 (19.5x21.5x0.75) Fiberglass MERV 1-4

    $183.99
    $183.99
    Case of 12 $15.33/filter
  • 19-1/2x21-1/2x1 (19.5x21.5x0.75) Exact Filters Pleated MERV 8 (12 pack)
    MERV 8
    Exact Filters

    19-1/2x21-1/2x1 (19.5x21.5x0.75) Pleated MERV 8

    $201.99
    $201.99
    Case of 12 $16.83/filter
  • 19-1/2x21-1/2x1 (19.5x21.5x0.75) Exact Filters Pleated MERV 11 (12 pack)
    MERV 11
    Exact Filters

    19-1/2x21-1/2x1 (19.5x21.5x0.75) Pleated MERV 11

    $258.99
    $258.99
    Case of 12 $21.58/filter

Commercial & facilities

Need 19-1-2x21-1-2x1 by the pallet?

Volume pricing on any size or MERV, plus recurring delivery schedules. We handle facilities and commercial orders daily and can usually match or beat distributor pricing.

Request a quote 1-866-469-8556 Talk to a filter expert

19-1-2x21-1-2x1 HVAC, Furnace & AC Filters

Replacement 19-1-2x21-1-2x1 air filters for homes, offices, and commercial HVAC systems. This collection covers every MERV rating we stock: fiberglass MERV 1–4, pleated MERV 8, MERV 10, MERV 11, and hospital-grade MERV 13. Free shipping on orders over $50.

If your rack is labeled 19-1-2x21-1-2x1, any filter here will fit. Actual dimensions vary slightly by manufacturer—check the product page for exact specs. Need a non-standard size? Our custom filters cut to 1/8″ precision.

Which MERV Rating Should I Choose?

  • MERV 1–4 (fiberglass) — Lowest cost. Protects your blower and coil from debris but won't improve air quality. Best for rentals and monthly-change schedules.
  • MERV 8 (pleated) — Residential and light-commercial standard. Captures dust, pollen, lint, and mold spores.
  • MERV 10–11 — Captures pet dander, finer particulate, and some bacteria. Recommended for pets, allergies, and facilities pursuing better IAQ.
  • MERV 13 — Hospital-grade. Captures smoke, bacteria, virus carriers, and most airborne allergens. ASHRAE and CDC recommend MERV 13 where the HVAC system can support it.

Not sure? Take our MERV quiz or call 1-866-469-8556.

How Often Should I Change a 19-1-2x21-1-2x1 Filter?

Plan on every 60–90 days for a 1″ filter in a typical residential or light-commercial system. Homes with pets, smokers, or allergies may need to replace every 30–60 days. Subscribe & save 10% on any filter in this collection.

Why Buy From RememberTheFilter.com

  • Trusted brands — AAF Flanders, Koch, and our own PrimeShield line, built by manufacturers we've partnered with for nearly two decades.
  • Filter Fit Guarantee — if it doesn't fit as expected, we'll make it right.
  • Free shipping over $50 to the lower 48, subscription discounts up to 10%, commercial & bulk pricing available.