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21x21x1 Air Filter

What do you want in your 21x21x1 air filter? Obviously, clean air. Less unwanted debris in your home or office. Affordable prices would be great. The option to replace your filter less frequently would be the dream. With Air Filters Delivered, we want to make sure you get exactly what you want in your air filter. With manufacturing plants in the USA, we don't have to worry about vendor or overseas shipping costs, meaning we can provide the best possible prices on our 21x21x1 air filters. Our various MERV ratings offer options of increased filtration and fewer necessary replacements. Not only can you customize your order based on MERV rating, but you can choose from a 6-pack or 12-pack bundle, which means, potentially, all your air filters for the year can be purchased in just a few clicks. Free shipping available with every purchase.
  • Home Basic

    Fiberglass | MERV Rating 6
    21 x 21 x 1 MERV 6 Fiberglass Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 20 7/8" x 20 7/8" x 3/4"
    • Product #: D50S.012121
  • Home Select

    Pleated | MERV Rating 8
    21 x 21 x 1 MERV 8 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 20 7/8" x 20 7/8" x 3/4"
    • Product #: P80S.012121
  • Home Plus

    Pleated | MERV Rating 11
    21 x 21 x 1 MERV 11 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 20 7/8" x 20 7/8" x 3/4"
    • Product #: P15S.012121
  • Home Ultimate

    Pleated | MERV Rating 13
    21 x 21 x 1 MERV 13 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
    View Terms and Conditions
    • Actual Size: 20 7/8" x 20 7/8" x 3/4"
    • Product #: P25S.012121
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