Lennox X6664 | Our#: 110210

Lennox Model X6664 MERV 11 Replacement Filter - 17 x 26 x 4, 2-Pack

6 review(s)
Average rating 5/5
5 stars
4 stars
3 stars
2 stars
1 star

Lennox X6664 | Our#: 110210

  •  Fast Shipping & Free Returns
  •  100% Compatibility Guarantee

Reduce common allergy symptoms

  • Reduces allergy irritating particles
  • Captures allergens like dust, mold spores, pet dander, dust mite debris and more
  • Lessens odors from car fumes & smog
  • Creates cleaner indoor air
  • Actual Dimensions: 16 ½" x 25 ⅞" x 3 1516"

6 people in your area recently purchased this product!

  •  Fast Shipping & Free Returns
  •  100% Compatibility Guarantee
Frequently Purchased Together
Frequently Purchased Together

Product Details

Factory original filter from Lennox. This Healthy Climate MERV 11 filter fits the PureAir air purification system. The X6664 cartridge can last up to 6 months, though product replacement life cycle depends on the individual conditions and needs of your home. 

  • MERV 11 electrostatically charged media
  • Synthetic media offers large surface area for maximum dirt holding capacities with minimum air resistance
  • Captures dust mites, pollen, mold spores, pet dander and other contaminants down to 0.3 microns
  • Replaces catalog number X6664 (formerly 75X74)
  • Fits Healthy Climate PureAir  PCO-12C Air Purifier
  • Nominal Dimensions: 17" x 26" x 4"
  • Actual Dimensions 16-1/2" x 25-7/8" x 3-15/16"
  • Factory original, OEM product

Replaces These Filters:

National Filter Sales:

Fits In These Systems:


Lennox® and Healthy Climate® are registered trademarks of Lennox International Inc.. National Trade Supply, Inc, DiscountFilters.com and AIRx are not affiliated with Lennox International Inc.

How to change your furnace/air-conditioner/HVAC air filter

Estimated time: 10 minutes or less


  1. Determine the location of your filter

    Your forced air system will be similar, whether or not it is a heating (furnace) or cooling (AC) system – or both. The furnace filter housing/slot is located right next to the heating/cooling system’s air handler or blower. Your filter(s) may also be located in a return grille on the wall or ceiling of your home.

  2. Determine the type/size of filter that you use

    Typically, the dimensions or part number of the filter will be printed on the filter frame. Use this information to order a new filter.

  3. Purchase a new air filter from DiscountFilters.com

    Visit DiscountFilters.com and purchase a new filter. Use our filter finders to verify the correct match.

  4. Remove the old filter

    Turn off the power to the heating/cooling system and remove the old filter from its housing/slot and discard.

  5. Insert the new filter

    Pay attention to any airflow direction arrows printed on the frame of the new filter. Install the filter by sliding it into the filter housing/slot with the airflow arrow pointing towards the blower. If installing the filter in a wall or ceiling grille – the airflow arrow should point towards the wall or ceiling. Turn on the power to the forced air system.

    Enjoy cleaner air!