MERV 11 Filters Fast® 4" AC and Furnace Air Filters 3-pack


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$79.95 ea
FF4M11 Sizes :
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The Filters Fast® FF4M11 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.


  • Brand: Filters Fast®
  • Part Number: FF4M11
  • Pack Size: 3 Filters
  • MERV Rating: 11
  • Filter Type: Electrostatic pleated
  • Material: Synthetic
  • Replace every 6-12 months
  • For commercial and residential use
  • Note: These filters do not contain fiberglass.

The Filters Fast® FF4M11 3-Pack 4" Air Filter 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

NOTE: If you don't see your size, order a custom made air filter! Custom made air filters do not come individually wrapped. Please be advised that some larger filters require an additional cost (see dropdown window above).

Additional Resources:

For more information on air filter efficiency ratings, check out our resources below!


Compatible Parts:

The MERV 11 Filters Fast® 4" AC and Furnace Air Filters 3-pack is the correct replacement for the following part numbers:

Part Number
Aprilaire 261
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Customer Reviews:

Total Reviews: 49 | Average Rating: 4.9 / 5.0

Robert Uland2022-11-15

Slightly smaller than original.

Collected by

Love the filters we use, good price and quality, with fast service. We'll be ordering again from this wonderful company

Collected by

Like the availability and the fact it comes right to my home.

Collected by
Jay Finlinson2022-09-07

I use them for many years now. No issues with this product

Collected by
David Baker2022-07-27

Met my needs.

Collected by

Filters are perfect

Collected by
Margaret Mccabe2022-06-20

Very pleased with the filters, the price and service.

Collected by
Betty Gallagher2022-06-17

Been using these for several years. I own a mini strip mall and one of my tenants is a dog grooming business. I recently had to replace the furnace in the grooming business and was advised to change filters more often so was wondering if you could send me another 3-pack of the same filters? Please e-mail me back if you will do this. Thanks.

Collected by
KC Ramsay2022-06-09

Delighted to rely on this trusted source for filters.

Collected by

Excellent product. I learned from my spouse about this company before he passed away. Now that it’s my job to purchase the filters I am so happy and thrilled that I am actually doing something right when I have to order my filters.

Collected by

These filters were too big had to re order 3" filters. You have my ratings on that order already. It was handled by your customer service the day the 4" filters were delivered I reorder the correct size. Thanks

Collected by
Jeffrey C2022-04-24

These filters are exactly what we need at a great price!

Collected by
Arnaz Fanning2022-04-09

I have used these filters in the past and they have proven to be very reliable and efficient.

Collected by
Ruth Homola2022-03-28

Good service!

Collected by

This is a good quality product at a reasonable price.

Collected by
Gary Lyle2022-03-19

Quality product that equals the name brands

Collected by
Kam Cheung2022-03-09

reliable filter.

Collected by

Great product.

Collected by
Janet Burnette2022-02-20

Good service & reasonable price.

Collected by
Jeff from Indy2022-02-10

Just what I needed

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