*Please be advised that some larger filters require an additional cost (see dropdown window above).
- 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"
Save up to 20% on first order, 10% on future orders and get FREE shipping on every order.
Filtration essentials delivered on your schedule.
Learn More
1" MERV 11 Furnace & AC Air Filter by Filters Fast® - 6-Pack
Filters Fast® Custom Size Air Filters - Made to your size FastThe 4" MERV 11 Furnace & AC Air Filter by Filters Fast® - 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.
Note: These filters do not contain fiberglass.
Specifications:
- Brand: Filters Fast®
- Part Number: FF4M11
- Pack Size: 3
- Filter Life: 6 - 12 Months
- MERV Rating: 11
- Filter Type: Electrostatic pleated
- Material: Synthetic
- For commercial and residential use
Available Sizes:
The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® 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 | 15.5x19.5x3.625 | PF11.0416203PFF |
| 16x25x4 Air Filter | 15.5x24.5x3.625 | PF11.0416253PFF |
| 18x24x4 Air Filter | 17.375x23.375x3.625 | PF11.0418243PFF |
| 20x20x4 Air Filter | 19.5x19.5x3.625 | PF11.0420203PFF |
| 20x24x4 Air Filter | 19.375x23.375x3.625 | PF11.0420243PFF |
| 20x25x4 Air Filter | 19.5x24.5x3.625 | PF11.0420253PFF |
| 24x24x4 Air Filter | 23.375x23.375x3.625 | PF11.0424243PFF |
| 25x29x4 Air Filter | 24.375x28.375x3.625 | PF11.0425293PFF |
Custom Sizes:
- If you don' t see your size, order a custom made air filter! Custom made air filters do not come individually wrapped.
Compatible Parts:
The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack is the correct replacement for the following part numbers:
Compatible Models:
The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® - 3-Pack is correct replacement for the following model numbers:
Frequently Asked Questions:
How do you install the 4" MERV 11 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 11 Furnace & AC Air Filter by Filters Fast®?
Changing your 4" MERV 11 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 11 Furnace & AC Air Filter by Filters Fast® reduce?
The 4" MERV 11 Furnace & AC Air Filter by Filters Fast® is a MERV 11 air filter, which means that it reduces the following contaminants:
- Dust
- Pollen
- Mold Spores
- Pet Dander
- Dust Mites
- Smoke & Smog
- Other Common Airborne Allergens
So the 4" MERV 11 Furnace & AC Air Filter by Filters Fast® can help reduce dust in my home?
Correct! By capturing airborne dust particles before they circulate through your HVAC system, this filter can help reduce dust buildup in your home and improve overall indoor air quality.
Dust levels also depend on factors like ventilation, pets, and household activity, so you may have to replace your filter more frequently based on the above factors.
Does it matter which way the arrow points?
It does! The arrow printed on the edge of the frame must point toward the direction the air is moving. Installing it backwards reduces its dust-holding capacity and can increase the strain on your system.
Can I wash and reuse the 4" MERV 11 Furnace & AC Air Filter by Filters Fast®?
No! These are disposable filters. Attempting to wash them will strip the electrostatic charge from the fibers and damage the pleated structure. This renders the filter useless and potentially allows debris to bypass the filter and damage your HVAC coils.
Customer Reviews:
It works great. The Staff is exceptional to resolve issues!!!!
Collected by Trustpilot.comThese filters are made very well and they last longer than any other type filters I have used before. I’m a happy customer
Collected by Trustpilot.comWell manufactured product.
Collected by Trustpilot.comGreat quality product. Perfect fit. Auto delivery very convenient feature.
Collected by Trustpilot.comgood product for home use
Collected by Trustpilot.comTHEY ARE GREAT AND PRICED RIGHT !!
Collected by Trustpilot.comWorks well.
Collected by Trustpilot.comQuality at best price anywhere I have found.
Collected by Trustpilot.comgood filters but expensive
Collected by Trustpilot.comThese filters arrived in great condition and are exactly what I need for my furnance.
Collected by Trustpilot.comI rated both categories 5 stars, but I'm not collecting performance data, lol. However, my 3M one of same dimensions is thicker and seems to be a tad bigger overall, so fits my AC unit a bit better. I get way too many emails from Filters Fast. Customer service I have received was good.
Collected by Trustpilot.comGreat products, fast delivery, good prices - what else is needed?
Collected by Trustpilot.comEasy to order and quick to ship.
Collected by Trustpilot.comWork fine. Not too expensive. Conveniently shipped.
Collected by Trustpilot.comGreat service.
Collected by Trustpilot.comA great quality product for a good price. I've never had a problem with these filters.
Collected by Trustpilot.comDouble check the actual size. They don’t work in a 4” fitment. They are actually only a little over 3”.
Collected by Trustpilot.comThought price was high
Collected by Trustpilot.comAs far as I can tell, they seem to work well. I only need to change them once a year.
Collected by Trustpilot.comCustom filters just right for my HVAC with the highest level of filtration my system can handle. Always delivered on time as scheduled.
Collected by Trustpilot.comProduct Availability
Please provide your e-mail address below to receive a notification when this product becomes available:
XThanks! We'll send you a notification when this product is available!
