• 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.

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20x25x4 Standard Filters

NOTE: Please compare the actual size of your current filter with the actual sizes listed on our site. A nominal 20" x 25" x 4" filter can be different actual sizes depending on the brand of your air cleaner.
Showing 1 -  8 of 8 Products
20x25x5 AIRx DUST Honeywell FC100A1037 Replacement Filter - MERV 8, 2-Pack
$40.95 / Filter
$51.19 Save 20%!
Ships Free!
20x25x5 AIRx ALLERGY Honeywell FC100A1037 Replacement Air Filter - MERV 11, 2-Pack
$43.95 / Filter
$54.94 Save 20%!
Ships Free!
20x25x5 AIRx HEALTH Honeywell FC100A1037 Replacement Air Filter - MERV 13, 2 pack
$59.95 / Filter
$74.94 Save 20%!
Ships Free!
20x25x5 AIRx ODOR Honewell FC100A1037 Replacement Air Filter - Carbon, 2-Pack
$45.95 / Filter
$57.44 Save 20%!
Ships Free!
20x25x4 AIRx ALLERGY Air Filter - MERV 11, 6-Pack
$28.49 / Filter
$35.61 Save 20%!
Ships Free!
20x25x4 AIRx HEALTH Air Filter - MERV 13, 6-Pack
$37.49 / Filter
$46.86 Save 20%!
Ships Free!
20x25x4 AIRx ODOR Air Filter - Carbon, 6-Pack
$33.64 / Filter
$42.05 Save 20%!
Ships Free!
Lennox Model X6675 MERV 16 Replacement Filter - 20 x 25 x 5
$178.40 / Filter
$223.00 Save 20%!
Ships Free!
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What Our Customers Have to Say

Alvin B. 1 day ago
5
Fits better than orginal filter
GP 1 day ago
5
Very easy replacement: slide out, slide in!
Lynda S. 1 day ago
5
The two filters required for our Heat / AC unit reside on the interior side of the removable panel door. When purchasing filters from a source other than Discount Filters, we found they were NOT truly the size they claimed. Filters did not easily fit into place because the filters cardboard framing exceeds the 1 inch declaration. I questioned the sales agent regarding that issue when making this purchase. She stated the dimensions provided by Discount Filters are accurate - that we would not be disappointed. SHE WAS ABSOLUTELY CORRECT!
Wendy-Jean F. 1 day ago
5
ever since I had a new furnace installed 10 years ago I have installed the filter, easy to do.