AIRx 20x20x4WR-ALLERGY | Our#: 178127

20x20x4 AIRx ALLERGY White Rodgers FR1600M-111 Replacement Air Filter - MERV 11

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AIRx 20x20x4WR-ALLERGY | Our#: 178127

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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: 19 ½" x 19 ½" x 3 ¾"

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Product Details

20x20x4 AIRx ALLERGY White Rodgers FR1600M-111 Replacement Air Filter - MERV 11
(19-1/2" X 19-1/2" X 3-3/4" Actual dimensions)

Replacement for 4" premium whole house air cleaners from White-Rodgers. Not Manufactured by White-Rodgers.


  • Same size as Filter part # FR1600M-111 and works in the air cleaner model ACM1600M
  • MERV 11 Rating
  • Removes allergens from the air such as pollen, mold pores, dust particles, pet dander and bacteria.
  • Cost efficient aftermarket product built to replace the original part 
  • Disposable after use
  • Easy installation
  • Lasts approximately 6 months - replace sooner with heavy use or certain environmental conditions

Do you want to know about the technical specs?

Nominal Dimensions
20 x 20 x 4"
Actual Dimensions
19 ½ x 19 ½ x 3 ¾"
Filter Media
Electrostatically charged 100% synthetic gradient media that does not support microbiological growth
Filter Support Grid
30 gauge galvanized expanded metal grid
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:

National Filter Sales:

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

    Visit 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!