*Please be advised that some larger filters require an additional cost (see dropdown window above).
- Size Actual Dimension
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12x24x4 11.375" x 23.375" x 3.625"
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16x20x4 15.5" x 19.5" x 3.625"
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16x25x4 15.5" x 24.5" x 3.625"
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18x24x4 17.375" x 23.375" x 3.625"
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20x20x4 19.5" x 19.5" x 3.625"
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20x24x4 19.375" x 23.375" x 3.625"
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20x25x4 19.375" x 24.375" x 3.625"
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24x24x4 23.375" x 23.375" x 3.625"
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25x29x4 24.375" x 28.375" x 3.625"
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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 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: These filters do not contain fiberglass.
Specifications:
- Brand: Filters Fast®
- Part Number: FFM136, Ffm1362
- Pack Size: 3
- 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 | 15.375x19.375x3.625 | PF13.0416203PFF, ffm136-16204 |
16x25x4 | 15.375x24.375x3.625 | PF13.0416253PFF, ffm136-16254 |
18x24x4 | 17.375x23.375x3.625 | PF13.0418243PFF, ffm136-18244 |
20x20x4 | 19.375x19.375x3.625 | PF13.0420203PFF, ffm136-20204 |
20x24x4 | 19.375x23.375x3.625 | PF13.0420243PFF, ffm136-20244 |
20x25x4 | 19.375x24.375x3.625 | 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®?
- Once your air filters arrive, gather your supplies including a ladder (if needed,) safety goggles, gloves, a mask, and a disposable bag.
- Remove the metal grate from your air return.
- Carefully remove the used air filter and place it immediately and gently into the disposable bag. Then tie the bag sealed.
- 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?
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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:
Customer Reviews:
Works perfect in my furnace--I will continue to buy this filter as needed.
Collected by Trustpilot.comBest filter on the market at an affordable price.
Collected by Trustpilot.comThese are really good and delivery was very quick.
Collected by Trustpilot.comGreat product but the price needs adjusted to a reasonable price.
Collected by Trustpilot.comIt is the best one can buy to protect our indoor air quality.
Collected by Trustpilot.comGood quality pproduct at a fair price.
Collected by Trustpilot.comGood for homes with asthma and pets
Collected by Trustpilot.comToo soon to tell regarding comparitive quality/value
Collected by Trustpilot.comseems to be a good product
Collected by Trustpilot.comThey didn't fit my furnace. The size stated was less than my filter praying the furnace. Although my furnace tray is the same size statedthat the filters were. The filters are not. Although filters fast said just keep em. We'll refund your money. I need check to ensure it was refunded. I'm sure they'll work as mfg'd in a furnace filter they'll actually fit. But they were not 20x20x4 inches as stated.
Collected by Trustpilot.comGood quality. Good customer service.
Collected by Trustpilot.comThis product is what i need for my furnace. Came in one box and was in fine condition.
Collected by Trustpilot.comThese filters were described as being 4 inches thick. They are only 3.5 inches. I should have bought them in a local store where I could see them in person before purchase.
Collected by Trustpilot.comKeeps the house clean
Collected by Trustpilot.comMERV 13 is a little better than most homeowners would use in a residential setting, but I'm a go for the gusto extremist, and a retired Stationary Engineer, who knows the value of a good preventive maintenance program, and good filtration. These are the best I've found.
Collected by Trustpilot.comThe best easiest to install filters we’ve ever used
Collected by Trustpilot.comWe feel that the air quality is very much better than earlier selection.
Collected by Trustpilot.comWorks great Good Price
Collected by Trustpilot.comThe right size and quality when I need it.
Collected by Trustpilot.comWorks as expected
Collected by Trustpilot.comProduct Availability
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