• 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

  • 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

20 X 20 X 4" Standard Filters

NOTE: Please compare the actual size of your current filter with the actual sizes listed on our site. A nominal 20" x 20" x 4" filter can be different actual sizes depending on the brand of your air cleaner.
Showing 1 -  7 of 7 Products
20x20x5 AIRx DUST Honeywell FC100A1011 Replacement Air Filter - MERV 8, 2-Pack
$39.98 / Filter
$49.97 Save 20%!
20x20x5 AIRx ALLERGY Honeywell FC100A1011 Replacement Air Filter - MERV 11, 2-Pack
$49.98 / Filter
$62.47 Save 20%!
20x20x5 AIRx HEALTH Honeywell FC100A1011 Replacement Air Filter - MERV 13, 2-Pack
$59.98 / Filter
$74.97 Save 20%!
20x20x4 AIRx DUST Air Filter - MERV 8, 6-Pack
$24.99 / Filter
$31.24 Save 20%!
20x20x4 AIRx ALLERGY Air Filter - MERV 11, 6-Pack
$27.83 / Filter
$34.79 Save 20%!
20x20x4 AIRx HEALTH Air Filter - MERV 13, 6-Pack
$32.17 / Filter
$40.21 Save 20%!
20x20x4 AIRx ODOR Air Filter - Carbon, 6-Pack
$33.33 / Filter
$41.66 Save 20%!
1 


What Our Customers Have to Say

MICHAEL B. 1 day ago
5
I usually reorder these once or twice a year. I use them each month and can clearly see that they are catching "stuff". I like their performance and cost.
JONATHAN K. 1 day ago
5
Only manufacturer I found that offers odd sizes. Fits perfectly ?
mac 2 days ago
5
Reasonably priced. Free delivery
Philip K. 3 days ago
5
These filters are high quality and fit perfectly in my Lenox A /C unit. I’ve been using Filter Buy for several years now and have been pleased with the quality, fit and value! I’ve installed additional filters in the return vents through the house to “double filter” the air. I think that having these additional “pre-filters “ should extend the life of the primary filter in my A/C unit.