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actual size
  • 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 19.5" x 24.5" 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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MERV 13 FiltersFast 4" Allergy AC and Furnace Filter 3-Pack


Only $28.65 per Filter
Retail: $100.99 /ea
You Save: 15%
As low as
Retail: $100.99
You Save: 15%
4 MERV 13 Air Filter Sizes :
Ships in 1 to 2 business days.
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The FiltersFast 4-inch Air Filters (FFM136) have a MERV 13 rating and are useful in a variety of settings, including homes, offices, and industrial sites. These MERV 13 filters effectively reduce pollen, dust, pet dander, mold spores, and dust mites, as well as bacteria, smoke, smog, and other allergens. The higher quality construction from these 4-inch filters benefits health and respiration, including alleviating problems with allergies and sinus irritation that might lead to itchy throat, watery eyes, coughing, and sneezing. 4-inch air filters are also more effective than thinner filters because their larger surface areas are much more durable. FiltersFast air filters are affordable without sacrificing quality. These HVAC air filters arrive in a variety of sizes to meet your air quality needs.

Note: These filters do not contain fiberglass.


  • Brand: FiltersFast
  • Part Number: FFM136, Ffm1362
  • Pack Size: 3
  • Filter Life: 6 - 12 months
  • MERV Rating: 13

Available Sizes:

The FiltersFast M13 Air Filters are available in the following sizes:  

Nominal Size Actual Size Alternate Part Number
12x24x4 11.375x23.375x3.625 PF13.0412243PFF
16x20x4 15.375x19.375x3.625 PF13.0416203PFF
16x25x4 15.375x24.375x3.625 PF13.0416253PFF
18x24x4 17.375x23.375x3.625 PF13.0418243PFF
20x20x4 19.375x19.375x3.625 PF13.0420203PFF
20x24x4 19.375x23.375x3.625 PF13.0420243PFF
20x25x4 19.375x24.375x3.625 PF13.0420253PFF
24x24x4 23.375x23.375x3.625 PF13.0424243PFF
25x29x4 24.375x28.375x3.625 PF13.0425293PFF

Please note that if you are unsure whether you need an actual or nominal size simply measure your air filter before placing your order. 

We can make any size filter! Click here if you don't see your size! NOTE: Custom made air filters do not come individually wrapped.


FFM13 Air Filter - MERV 13 - Specification Data Sheet


Customer Reviews:

Total Reviews: 15 | Average Rating: 4.95 / 5.0

arrived on time

Collected by

Great value. Fast delivery. Excellent communication.

Collected by

Highly effective filters. Much improved capturing of dust and pollen resulting in better air quality.

Collected by

Cannot judge the quality of these Rve13 filters at this time, it is the first time I use them and they were just installed

Collected by

Just switched from MERV 11 to MERV 13 filters, have not installed yet. This company has fast delivery service. Very satisfied so far

Collected by

Easy to order and fast delivery - great service.

Collected by

This MERV 13 filter fit perfectly. Functions flawlessly.

Collected by

High quality reliable service

Collected by

Easy and quick delivery

Collected by