20x25x4 M11 MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack
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*Please be advised that some larger filters require an additional cost (see dropdown window above).

  • Size Actual Dimension
  • 12x24x4 11.375" x 23.375" x 3.625"
  • 16x20x4 15.5" x 19.5" x 3.625"
  • 16x25x4 15.5" x 24.5" x 3.625"
  • 18x24x4 17.375" x 23.375" x 3.625"
  • 20x20x4 19.5" x 19.5" x 3.625"
  • 20x24x4 19.375" x 23.375" x 3.625"
  • 20x25x4 19.375" x 24.375" x 3.625"
  • 24x24x4 23.375" x 23.375" x 3.625"
  • 25x29x4 24.375" x 28.375" x 3.625"
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20x25x4 M11 MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack

FF4M11

$82.95
Only $27.65 per Filter
Retail: $99.99 /ea
You Save: 17%
As low as
$82.95
Retail: $99.99
You Save: 17%
FF4M11 Sizes :
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The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack is a set of MERV 11 filters that effectively reduce pollen, dust, pet dander, mold spores, dust mites and other allergens from indoor air. Removing these airborne particles can help improve allergies and alleviate sinus irritation that can cause watery eyes, itchy throat, coughing, and sneezing. The MERV 11 filter media is electrostatically charged and constructed with spun micro-fiber that also will not retain moisture, which can lead to microbial growth. Aside from the health benefits, these HVAC filters will also extend the life of your heating and cooling system by making it work more efficiently.

Note: These filters do not contain fiberglass.

Specifications:

  • Brand: Filters Fast®
  • Part Number: FF4M11
  • Pack Size: 3
  • Filter Life: 6 - 12 Months
  • MERV Rating: 11
  • Filter Type: Electrostatic pleated
  • Material: Synthetic
  • For commercial and residential use

Available Sizes:

The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® is available in the following sizes:

Nominal Size Actual Size Alternate Part Number
12x24x4 Air Filter 11.375x23.375x3.625 PF11.0412243PFF
16x20x4 Air Filter 15.375x19.375x3.625 PF11.0416203PFF
16x25x4 Air Filter 15.375x24.375x3.625 PF11.0416253PFF
18x24x4 Air Filter 17.375x23.375x3.625 PF11.0418243PFF
20x20x4 Air Filter 19.375x19.375x3.625 PF11.0420203PFF
20x24x4 Air Filter 19.375x23.375x3.625 PF11.0420243PFF
20x25x4 Air Filter 19.375x24.375x3.625 PF11.0420253PFF
24x24x4 Air Filter 23.375x23.375x3.625 PF11.0424243PFF
25x29x4 Air Filter 24.375x28.375x3.625 PF11.0425293PFF

Custom Sizes:

  • If you don' t see your size, order a custom made air filter! Custom made air filters do not come individually wrapped.

How do you install the 4" MERV 11 Furnace & AC Air Filter by Filters Fast®?

  1. Once your air filters arrive, gather your supplies including a ladder (if needed,) safety goggles, gloves, a mask, and a disposable bag.
  2. Remove the metal grate from your air return.
  3. Carefully remove the used air filter and place it immediately and gently into the disposable bag. Then tie the bag sealed.
  4. Place the new air filter in place of the filter you just removed and replace the metal grille.

How often should you replace the 4" MERV 11 Furnace & AC Air Filter by Filters Fast®?

  • Changing your 4" MERV 11 Furnace & AC Air Filter by Filters Fast® is a very quick and easy process that should be done once every six to twelve months.

What contaminants does the 4" MERV 11 Furnace & AC Air Filter by Filters Fast® reduce?

  • The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® is a MERV 11 air filter, which means that it reduces the following contaminants:

    • Dust
    • Pollen
    • Mold Spores
    • Pet Dander
    • Dust Mites
    • Smoke & Smog
    • Other Common Airborne Allergens

Compatible Parts:

The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack is the correct replacement for the following part numbers:

Part Number
Aprilaire 261
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Customer Reviews:

Total Reviews: 77 Average Rating: 4.85 / 5.0

Filtersfast Reviews on Trust Pilot external site
Gail Padgett2024-03-20

Thanks for your speedy delivery.

Collected by Trustpilot.com
John O - Kokomo2024-03-10

Great service - good filters

Collected by Trustpilot.com
Warren2024-03-10

Excellent for dust control

Collected by Trustpilot.com
Dan2024-03-08

Quick and dependable! The filter club makes it easy to have filters on hand.

Collected by Trustpilot.com
Steve Welch2024-03-05

Quality filters @ affordable prices and good discounts throughout the year!

Collected by Trustpilot.com
Diana Yeh2024-03-04

Excellent products, comparable to the brand names in performance yet cost less

Collected by Trustpilot.com
Dennis Suarez2024-02-29

They are not 4” thick. The actual dimension is 3 1/2”.

Collected by Trustpilot.com
Evelyn Watson2024-02-23

Work great! Thanks

Collected by Trustpilot.com
Tom2023-12-17

Good product

Collected by Trustpilot.com
uboatman2023-12-12

I bought the size filter that my system uses but found they do not fit in my filter housing because the filters are too small. Probably a mistake on my part in not confirming that it was designed for my application. The filters appear to be of good quality, but are of no use to me. i need to investigate a return.

Collected by Trustpilot.com
Rita2023-10-03

It is a good product for my forced air heating.

Collected by Trustpilot.com
Gina2023-08-09

Recommend by manufacturer

Collected by Trustpilot.com
Jean Pieske2023-08-04

Comes delivered to my home and does a good job.

Collected by Trustpilot.com
Stephen Bailey2023-07-02

All good, will provide farther information after use.

Collected by Trustpilot.com
Dave Yates2023-06-11

works well for me

Collected by Trustpilot.com
Jay Andersen2023-06-06

Good filters.

Collected by Trustpilot.com
Melvin2023-05-27

Really great price and is exactly what I need for my Air Handler

Collected by Trustpilot.com
Ian H.2023-04-21

Hard size to find locally 16x20x4! They fit perfectly in my air handler up in the attic and 2 spares for later.

Collected by Trustpilot.com
PHILLIP REED2023-04-04

Great value and convenient to order online. No guessing what you might find in a box store.

Collected by Trustpilot.com
Murry Card Jr2023-04-03

Does the job well.

Collected by Trustpilot.com

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