• 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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Replacement for Lennox 17x26x4" (X6664, X6666)

Showing 1 -  3 of 3 Products
Lennox Model X6666 MERV 16 Filter for PCO-12C - 17 x 26 x 4
$189.95 / Filter
$237.44 Save 20%!
1 Pack Selected
$189.95
Ships Free!
Lennox Model X6664 MERV 11 Replacement Filter - 17 x 26 x 4
$46.95 / Filter
$58.69 Save 20%!
1 Pack Selected
$46.95
Ships Free!
MERV 16 Replacement for Lennox X6666 Filter - 17 x 26 x 4
$104.99 / Filter
$131.24 Save 20%!
1 Pack Selected
$104.99
Ships Free!
1 

What Our Customers Have to Say

Mark B. 1 day ago
5
Great filter, fits perfect... nice to get a discount too!
for o. 1 day ago
5
The technician where I do get my furnace maintenance done encouraged these filters, and I have full trust in him and his expertise. Your company is always prompt, offer fair prices, and have excellent customer service!
LYNN M. 1 day ago
5
Priced right and easy to install.
Linda D. 1 day ago
5
The product I ordered from Discount Filters seems to be what I had ordered, totally satisfied unlike what I ordered from a different company last year. Thanks.