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Filters Fast - Filter. Purify. Protect.

4" MERV 13 Furnace & AC Air Filter by Filters Fast®

FFM136E

$32.95
Retail: $42.99 /ea
You Save: 23%
As low as
$32.95
Retail: $42.99
You Save: 23%
4 MERV 13 Air Filter Sizes :
Ships by Tomorrow 6/17/2026
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Frequently Bought With This Item

The Filters Fast® 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 Filters Fast® 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. Filters Fast® air filters are affordable without sacrificing quality. These HVAC air filters arrive in a variety of sizes to meet your air quality needs.

Note: This filter does not contain fiberglass.

Specifications:

  • Brand: Filters Fast®
  • Part Number: FFM136E, Ffm1362
  • Pack Size: 1
  • Filter Life: 6 - 12 months
  • MERV Rating: 13

Available Sizes:

The 4" MERV 13 Furnace & AC Air Filters by Filters Fast® are available in the following sizes:

Nominal Size Actual Size Alternate Part Number
12x24x4 11.375x23.375x3.625 PF13.0412243PFF, ffm136-12244
16x20x4 15.5x19.5x3.625 PF13.0416203PFF, ffm136-16204
16x25x4 15.5x24.5x3.625 PF13.0416253PFF, ffm136-16254
18x24x4 17.375x23.375x3.625 PF13.0418243PFF, ffm136-18244
20x20x4 19.5x19.5x3.625 PF13.0420203PFF, ffm136-20204
20x24x4 19.375x23.375x3.625 PF13.0420243PFF, ffm136-20244
20x25x4 19.5x24.5x3.625 PF13.0420253PFF, ffm136-20254
24x24x4 23.375x23.375x3.625 PF13.0424243PFF, ffm136-24244
25x29x4 24.375x28.375x3.625 PF13.0425293PFF, ffm136-25294

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

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 13 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 13 Furnace & AC Air Filter by Filters Fast®?

  • Changing your 4" MERV 13 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 13 Furnace & AC Air Filter by Filters Fast® reduce?

  • The 4" MERV 13 Furnace & AC Air Filter by Filters Fast® is a MERV 13 air filter, which means that it reduces the following contaminants:

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

Resources:

Compatible Parts:

The 4" MERV 13 Furnace & AC Air Filter by Filters Fast® is the correct replacement for the following part numbers:

Part Number
PF130412241P
PF130416201P
PF130416251P
PF130418241P
PF130420201P
PF130420241P
PF130420251P
PF130424241P
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