AIRx 20x21x5WR-DUST | Our#: 178120

20x21x5 AIRx DUST White Rodgers FR1600-100 Replacement Air Filter - MERV 8

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AIRx 20x21x5WR-DUST | Our#: 178120

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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: 20 ¼" x 21" x 5"

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Frequently Purchased Together

Product Details

20x21x5 AIRx DUST White Rodgers FR1600-100 Replacement Air Filter - MERV 8

Aftermarket Replacement for White-Rodgers Comfort PlusTM media filter. ASHRAE rated MERV 8. Replaces part # 825-0586.  Fits in ACM1600 Media Cabinet.

This product is not made by White-Rodgers.

Same as Filter Model # FR1600-100
Fits in ACB1600-101 Media Cabinet.
Same as filter in ACM1600-101 Cabinet Kit
Fits Air Cleaner Model 0121-018200

Size: 20" x 21" x 5"
Actual size:  20-1/4" x 21" x 5

This filter can also be used to replace the cells in the Model SST 16C26S-xxx electronic air cleaner.

. Durable construction for easy, slide-in replacement.
. Disposable for convenience.
. Packaged in convenient 2-pack.

Do you want to know about the technical specs?

Nominal Dimensions
20 x 21 x 5"
Actual Dimensions
20 ¼ x 21 x 5"
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!