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20x21x1 Air Filter

Have you replaced your 20x21x1 air filters recently? If not, take advantage of our American-made quality, free shipping, price match guarantee, and customization options. We manufacture our own products here, in the USA, making our air filters more affordable than other brands in the market. In addition to cost-effective pricing, you may choose from four different MERV ratings to find the air quality that best matches your individual needs for your home furnace or office AC unit.
  • Home Basic

    Fiberglass | MERV Rating 6
    Lint, Dust Mites, Mold Spores, Pollen & Pet Dander
    20 x 21 x 1 MERV 6 Fiberglass Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 19 7/8" x 20 7/8" x 3/4"
    • Product #: D50S.012021
  • Home Select

    Pleated | MERV Rating 8
    Lint, Dust Mites, Mold Spores, Pollen, Pet Dander & Fine Dust
    20 x 21 x 1 MERV 8 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
    View Terms and Conditions
    • Actual Size: 19 7/8" x 20 7/8" x 3/4"
    • Product #: P80S.012021
  • Home Plus

    Pleated | MERV Rating 11
    Lint, Dust Mites, Mold Spores, Pollen, Pet Dander, Fine Dust & Auto Emissions
    20 x 21 x 1 MERV 11 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
    View Terms and Conditions
    • Actual Size: 19 7/8" x 20 7/8" x 3/4"
    • Product #: P15S.012021
  • Home Ultimate

    Pleated | MERV Rating 13
    Lint, Dust Mites, Mold Spores, Pollen, Pet Dander, Fine Dust, Auto Emissions, Very Fine Dust, Smoke & Bacteria
    20 x 21 x 1 MERV 13 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
    View Terms and Conditions
    • Actual Size: 19 7/8" x 20 7/8" x 3/4"
    • Product #: P25S.012021
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