• Spend $70 or more and your order ships free! We'll get your filters out the door fast so you can enjoy clean air and water.*

    * Orders under $70 ship for $5.99.

  • Shop with confidence! If you're not completely satisfied with your purchase, you have up to one year to return it for a refund or exchange. We stand behind every filter we sell.

    Learn More

  • Every order is carefully packed and shipped by our team in Indiana. Your purchase helps support American jobs and hardworking families right here in the Midwest. Our AIRx Furnace / AC Filters and ClearChoice Fridge Filters are made in the USA.

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but we know there's nothing in your cart.

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  • Spend $70 or more and your order ships free! We'll get your filters out the door fast so you can enjoy clean air and water.*

    * Orders under $70 ship for $5.99.

  • Shop with confidence! If you're not completely satisfied with your purchase, you have up to one year to return it for a refund or exchange. We stand behind every filter we sell.

    Learn More

  • Every order is carefully packed and shipped by our team in Indiana. Your purchase helps support American jobs and hardworking families right here in the Midwest. Our AIRx Furnace / AC Filters and ClearChoice Fridge Filters are made in the USA.

Cart 0

We don't know what's in your water,
but we know there's nothing in your cart.

Menu

18x20x4 Filters

Showing 1 -  2 of 2 Products
18x20x4 AIRx DUST Air Filter - MERV 8
$24.83 / Filter
$31.04 Save 20%!
18x20x4 AIRx ALLERGY Air Filter - MERV 11
$26.50 / Filter
$33.12 Save 20%!
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What Our Customers Have to Say

Lane C. 1 day ago
5
Wrong product Shipped wrong I need a return label
Eugene F. 1 day ago
5
Everything from Discount Filters is high in quality and great money value. Ordering and shipping are great.
Karen O. 1 day ago
5
Great price. Saves me a lot of money. Great shipping.
Earl 1 day ago
5
Have used them for years and will continue to use them