AIRx 16x20x4-DUST | Our#: 178121

16x20x4 AIRx DUST White Rodgers FR1000M-108 Replacement Air Filter - MERV 8

AIRx 16x20x4-DUST | Our#: 178121

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Enjoy a cleaner home with less work

  • Reduces dust, lint, dust mites, pollen
  • Will help keep your HVAC system clean
  • Maintains superior airflow
  • Creates cleaner indoor air
  • Actual Dimensions: 15 ⅜" x 19 ⅜" x 3 ⅝"

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Product Details

Replacement for White Rodgers FR1000M-108- Rated MERV 8. 

16x20x4 (actual size 15-3/8" X 19-3/8" X 3-5/8")

Aftermarket replacement for 4" premium whole house air cleaners from White-Rodgers. 


  • Same size as filter part # FR1000M-108
  • Fits in Air Cleaner Model ACM1000M
  • MERV 8 Rating
  • Attracts common large household allergens like dust, pollen, and mold spores
  • Save money by purchasing a "generic" aftermarket product.  Not manufactured by White-Rodgers 
  • Durable construction for easy, slide-in replacement
  • Disposable for convenience
  • Replace approximately every 6 months - depending on fan hours and environmental conditions

Do you want to know about the technical specs?

Nominal Dimensions
16 x 20 x 4"
Actual Dimensions
15 ⅜ x 19 ⅜ x 3 ⅝"
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!