• 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 21x26x4" (X6669)

Showing 1 -  2 of 2 Products
Lennox Model X6669 MERV 16 Filter for PCO-20C - 21 x 26 x 4
$205.95 / Filter
$257.44 Save 20%!
1 Pack Selected
$205.95
Ships Free!
MERV 16 Replacement for Lennox X6669 Filter - 21 x 26 x 4
$110.19 / Filter
$137.74 Save 20%!
1 Pack Selected
$110.19
Ships Free!
1 

What Our Customers Have to Say

JAMES G. 1 day ago
5
works very well.
customer 1 day ago
5
Your product is very good. I don’t need your advertising reminders because I have only ONE use for your filter in my furnace . I have no other filter needs remind me in the fall, once.
Barbara C. 1 day ago
5
Best quality for my furnace. Recommended by Atlas Butler when they installed my furnace.
Sheila P. 2 days ago
5
Fits perfectly