• No minimums, no surprises — we ship every order for free! We’ll get your filters out the door fast so you can enjoy clean air and water without paying extra.

  • 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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  • No minimums, no surprises — we ship every order for free! We’ll get your filters out the door fast so you can enjoy clean air and water without paying extra.

  • 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%!
Ships Free!
18x20x4 AIRx ALLERGY Air Filter - MERV 11
$26.50 / Filter
$33.12 Save 20%!
Ships Free!
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What Our Customers Have to Say

Sharon S. 1 day ago
5
This filter is great. I buy it when it’s on sale for 35 per cent off and free shipping. Usually arrives earlier than predicted. Try it you will see the difference!
John H. 1 day ago
5
Great filtration in my home with three dogs and I will continue to buy in bulk when I need!
Ron F. 1 day ago
5
Just got. Haven’t used. Former ones are great.
Barbara A. 1 day ago
5
I am able to find the size filter I need at Discount filters. Other companies don’t carry my size. Have used Discount for over 11 years. Good quality, good pricing. Dependable company.