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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


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Only $28.32 per Filter
Retail: $99.99 /ea
You Save: 15%
As low as
Retail: $99.99
You Save: 15%

4 MERV 13 Air Filter Sizes :

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Product Information

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
  • 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 3/8 X 23 3/8 X 3 5/8 PF13.0412243PFF
16x20x4 15 1/2 X 19 1/2 X 3 5/8 PF13.0416203PFF
16x25x4 15 1/2 X 24 1/2 X 3 5/8 PF13.0416253PFF
18x24x4 17 3/8 X 23 3/8 X 3 5/8 PF13.0418243PFF
20x20x4 19 1/2 X 19 1/2 X 3 5/8 PF13.0420203PFF
20x24x4 19 3/8 X 23 3/8 X 3 5/8 PF13.0420243PFF
20x25x4 19 1/2 X 24 1/2 X 3 5/8 PF13.0420253PFF
24x24x4 23 3/8 X 23 3/8 X 3 5/8 PF13.0424243PFF
25x29x4 24 3/8 X 28 3/8 X 3 5/8 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: 10 | Average Rating: 5.0 / 5.0

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

Very satisfied, the old saying " service is king" .

Collected by

Really like how fast I received the filters. Being able to buy 3 at a time allowed me to have enough filters for at least one year! Thank you!

Collected by

Just what I ordered, delivered quickly

Collected by

These filters are extremely affordable and basically the same as in a big box store

Collected by

The Filter Fast filters are a great value.

Collected by

UPS destroyed shipping box and 3 filters. Sent a picture and customer service sent me a new box with no hassles and didn' t have me pay for the shipping a second time. Filters Fast is #1 in my book and I highly recommend them. Great prices, great service and get your filters fast.

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