AIRx 20x21x5LX-ALLERGY | Our#: 178255

20x21x5 AIRx ALLERGY Replacement for Lennox X8790 Air Filter - MERV 11

AIRx 20x21x5LX-ALLERGY | Our#: 178255

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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: 20" x 20 ⅝" x 4 ⅜"
20x21x5 AIRx ALLERGY Replacement for Lennox X8790 Air Filter - MERV 11

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Frequently Purchased Together

Product Details

20x21x5 AIRx ALLERGY Lennox X8790 Replacement Air Filter - MERV 11
(Actual size 20" x 20-5/8" x 4-3/8")

Features:

  • Budget alternative to and replacement for factory MERV 16 filter
  • MERV 11 Efficiency Rating
  • Removes including pollen, dust and dirt, pet dander, dust mites, mold/fungi, and other contaminants that can aggravate allergies
  • Change filter every 6-9 months, depending on environment
  • Fits model PCO14-23 Air Cleaner Cabinet

Do you want to know about the technical specs?

Nominal Dimensions
20 x 21 x 5"
Actual Dimensions
20 x 20 ⅝ x 4 ⅜"
Filter Media
Electrostatically charged 100% synthetic gradient media that does not support microbiological growth
Filter Support Grid
30 gauge galvanized expanded metal grid
Frame
Moisture resistant double-wall beverage board
Max Temperature
180F (82C) continuous service, peak 225F (107C)
Max Humidity
Resistant to 100% R.H.

Replaces These Filters:

Lennox:
X8790
National Filter Sales:
20x21x5

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

Steps

  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!