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Replacement filters can look almost identical, so the main question is not simply how many layers they have. You also need to know whether the filter actually fits your purifier and whether you are buying an original or aftermarket part. The FFAC MA-25 Replacement Filter is a four-filter aftermarket pack made for MA-25 S1, W1, and B1 air purifiers, with a pre-filter, H13 HEPA layer, and activated carbon layer. Its biggest advantages are the four-pack format and specific MA-25 compatibility, while the main tradeoff is that it is not a genuine Medify Air filter.
Quick Verdict
Rating: 8/10, Recommended with caveats
Best For: MA-25 S1/W1/B1 owners who want a multi-pack aftermarket replacement with HEPA and activated carbon filtration.
Bottom Line: This FFAC four-pack offers clear model compatibility and a useful three-layer filtration design. The main limitation is that buyers who specifically want a genuine Medify Air filter should choose the manufacturer’s replacement set instead.
Key Specifications
| Specification | Detail |
|---|---|
| Brand | FFAC |
| Product type | Aftermarket MA-25 replacement air filter |
| Pack quantity | 4 filters |
| Compatibility | MA-25 S1, W1, and B1 air purifiers |
| Filtration | Pre-filter, H13 True HEPA, and activated carbon |
| HEPA claim | Seller states 99.7% capture of particles as small as 0.3 microns |
| Listed MERV rating | 13 |
| Construction | Pleated; listing also identifies non-woven fabric and activated carbon |
| Listed dimensions | 7.09″L × 9.87″W × 1.1″Th |
| Listed item weight | 0.77 kg |
| Seller replacement guidance | Every 6–12 months, depending on use and conditions |
What Is the FFAC MA-25 Replacement Filter?
This product is a four-pack of FFAC replacement filters designed to fit MA-25 air purifiers identified as S1, W1, and B1. It is an aftermarket option rather than the genuine Medify Air replacement filter set, which matters if you prefer original manufacturer parts.
Each filter uses three filtration stages. A pre-filter handles larger debris, the H13 HEPA layer targets finer airborne particles, and activated carbon is included to help reduce common odors. The Amazon listing states that the H13 layer captures 99.7% of particles as small as 0.3 microns.
Before You Buy: This listing is branded FFAC. It is compatible with MA-25 S1/W1/B1 purifiers, but it is not the genuine Medify Air MA-25 Filter Set. Check the model label on your purifier before ordering.
Key Takeaways
- You receive four FFAC replacement filters in the listed package.
- The filters are specifically listed for MA-25 S1, W1, and B1 air purifiers.
- Each filter combines a pre-filter, H13 HEPA layer, and activated carbon layer.
- The seller states 99.7% particle capture at sizes down to 0.3 microns.
- The listed dimensions are 7.09 × 9.87 × 1.1 inches, with pleated construction.
- The seller recommends replacing a filter every 6–12 months, though actual life can depend on operating hours and indoor conditions.
- This is an aftermarket FFAC product, not an original Medify Air replacement filter.
Who Should Buy It?
Best For
- MA-25 S1/W1/B1 owners who have confirmed their purifier model.
- Households that prefer buying several replacement filters at once.
- Buyers comfortable using a compatible aftermarket filter instead of an original manufacturer part.
Skip If
- You specifically want a genuine Medify Air MA-25 filter.
- Your purifier is not an MA-25 S1, W1, or B1 model.
- You need independently published filtration test data for this exact FFAC filter.
How the 3-in-1 Filtration System Works
Pre-Filter for Larger Debris
The first stage is a pre-filter intended to catch larger material before air reaches the finer filtration layer. This helps keep hair, visible dust, fibers, and similar debris from immediately loading the HEPA media.
A pre-filter does not replace the finer filtration stages. Its main value is protecting the inner filter media and helping maintain usable airflow as the filter collects debris over time.
H13 HEPA Layer for Fine Particles
The Amazon listing identifies the filter material as H13 HEPA and states that it captures 99.7% of suspended particles as small as 0.3 microns. The product information also lists pleated construction, which increases the amount of filtering surface that can fit inside the filter frame.
That specification is a seller-stated performance claim for this FFAC product. You should not treat a replacement filter as medical equipment or as a substitute for removing pollution sources from your home.
Activated Carbon for Odors
The third layer uses activated carbon. Its role is different from the HEPA layer because carbon is intended to adsorb some odor-causing compounds rather than simply trap particles.
This can be useful in rooms affected by cooking smells, pet odors, or everyday household odors. Carbon performance can weaken as the material becomes saturated, so persistent odor after months of use can be one sign that replacement is due.
Fit and Compatibility
Compatibility is the most important buying check for this product. The listing specifies MA-25 S1, W1, and B1, so you should confirm the exact model printed on your purifier before purchasing. A filter that looks similar but has different dimensions can create gaps, restrict airflow, or fail to seat correctly.
The listed filter dimensions are 7.09 inches long, 9.87 inches wide, and 1.1 inches thick. Use those dimensions as an additional check if you are uncertain about your existing filter.
Pro Tip: Before throwing away your old filter, compare its dimensions and purifier model label with the replacement listing. That simple check is more reliable than buying by appearance alone.
Installation and Maintenance
Filter replacement should be simple, but you should follow the MA-25 purifier’s instructions rather than forcing the filter into place. Unplug the purifier before opening the filter compartment. Remove the used filter carefully so collected dust does not spill back into the room, then install the replacement in the correct orientation and close the grille completely.
After replacing a filter, the MA-25 purifier’s filter indicator may need to be reset according to the purifier manual. The official MA-25 instructions use the dimmer control to reset the replacement indicator after a new filter is installed.
The FFAC listing recommends replacement every 6–12 months. Treat that as general seller guidance rather than a guaranteed lifespan. A purifier running many hours per day in a dusty or smoky environment can load a filter more quickly than one used occasionally in a cleaner room.
Signs to Check Before the Calendar Date
- Airflow seems noticeably weaker even when the purifier setting has not changed.
- The filter surface has heavy visible dust buildup.
- Household odors return sooner than they did with a newer filter.
- The purifier’s filter replacement indicator turns on.
- The filter is damaged, bent, or no longer seats securely.
The listing does not describe this FFAC H13 filter as washable. Do not rinse the HEPA media with water unless the filter manufacturer specifically provides washable-filter instructions.
How It Performs in Real Use
For Everyday Bedroom or Office Use
For routine use, the three-stage design covers the main jobs expected from an MA-25 replacement filter: larger debris first, fine-particle filtration second, and activated carbon for common odors. The four-pack format also means you can keep replacements ready instead of ordering a new filter each time the current one reaches the end of its useful life.
For Homes With Pets
The pre-filter can help collect larger pet-related debris, while the HEPA layer is intended for finer airborne particles. Activated carbon may also help with some pet odors. Regular inspection matters more in homes with heavy shedding because the outer filter surface can accumulate debris faster.
For Cooking Odors or Smoke Particles
The combination of HEPA material and activated carbon gives this filter two different functions. The particulate layer handles airborne particles, while the carbon layer targets some odors. However, a replacement filter cannot remove the pollution source itself, and it should not replace proper ventilation or other safety measures when smoke or strong fumes are present.
For Long-Term Ownership
A four-pack is most useful when you already know the FFAC filter fits your MA-25 correctly and you plan to keep the purifier for an extended period. If you have never used this compatible filter before, the multi-pack creates more commitment than buying a single genuine replacement for a fit check.
Compatibility and Safety
This filter does not require electrical connections, but replacement still involves opening an electrical appliance. Unplug your MA-25 before changing the filter and follow the purifier manual for installation and indicator-reset instructions.
Do not run the purifier without its required filters installed, and do not force a filter that does not sit correctly in the compartment. A poor fit can allow air to bypass the filter media or interfere with normal airflow.
Air filters can reduce airborne particles captured by the purifier, but they do not diagnose, treat, cure, or prevent health conditions. If indoor air quality is a serious health concern, consider guidance from an appropriate medical or indoor-air-quality professional in addition to using an air purifier.
Pros and Cons
Pros
- Four replacement filters are included in the listed pack.
- Specific compatibility with MA-25 S1, W1, and B1 models.
- Three-stage filtration combines pre-filter, H13 HEPA, and activated carbon.
- Pleated construction provides additional filter surface in a compact format.
- Activated carbon adds odor-control capability alongside particle filtration.
Cons
- It is an FFAC aftermarket filter, not a genuine Medify Air replacement.
- The 99.7% filtration figure is a seller-stated claim for this listing.
- The four-pack may be more than you need if you only want to test fit once.
Is It Worth the Price?
The strongest value argument is the four-filter package. For an MA-25 owner who has already confirmed compatibility and expects to replace filters regularly, buying several at once can be more convenient than repeatedly ordering single replacements.
Value is less clear if original-manufacturer parts are your priority. Genuine Medify Air MA-25 replacement filters are available separately, so this FFAC pack is better suited to buyers comfortable choosing a compatible aftermarket option.
It is worth considering if you want multiple compatible filters with pre-filter, H13 HEPA, and activated carbon layers. It is not the best fit if genuine Medify branding or manufacturer-specific filter requirements are more important to you than pack quantity.
How It Compares to Alternatives
The most direct alternative is the Medify Air MA-25 Genuine Replacement Filter Set. The genuine set is the clearer choice if you want the purifier manufacturer’s own filter, while the FFAC product makes more sense if you want a four-pack aftermarket option.
Other aftermarket choices include Filter-Monster MA-25 compatible filters and several two-pack or four-pack MA-25 replacements from other sellers. When comparing them, focus on exact S1/W1/B1 compatibility, pack count, dimensions, filtration layers, and whether the brand provides clear replacement guidance rather than judging only by price.
Common Mistakes to Avoid
- Assuming every MA filter fits: MA-25 compatibility does not mean the filter fits other Medify purifier sizes.
- Confusing compatible with genuine: FFAC is the brand on this listing. It is not a Medify-branded filter.
- Ignoring the model suffix: Confirm S1, W1, or B1 before buying.
- Using only a calendar: Filter condition, purifier use, airflow, odors, and the replacement indicator can all help determine when replacement is due.
- Washing HEPA media without instructions: The listing does not state that this filter is washable.
Frequently Asked Questions
Is the FFAC MA-25 filter a genuine Medify Air filter?
No. The Amazon listing identifies FFAC as the brand and manufacturer. It is an aftermarket replacement made to fit compatible MA-25 S1/W1/B1 purifiers.
Which MA-25 models does this filter fit?
The listing specifically names MA-25 S1, W1, and B1 models. Check the model label on your purifier before purchasing rather than relying only on the filter’s appearance.
How many filters come in the package?
The selected Amazon listing is a four-pack. The product information lists four items and four packs, so it is designed for buyers who want multiple replacements available.
How often should you replace the FFAC MA-25 filter?
FFAC’s Amazon listing recommends replacement every 6–12 months. Actual useful life can vary with operating hours, dust, pets, smoke, and other indoor conditions, so also monitor the filter and purifier indicator.
Can you wash and reuse the filter?
The FFAC listing does not identify this H13 replacement filter as washable. Avoid rinsing HEPA media unless the manufacturer specifically provides instructions allowing it.
Does it include activated carbon?
Yes. The seller describes a three-layer system consisting of a pre-filter, H13 True HEPA layer, and activated carbon layer. The carbon portion is intended to help reduce common household odors.
Who should skip this replacement filter?
Skip it if your purifier is not an MA-25 S1/W1/B1 or if you specifically want an original Medify Air replacement filter. It may also be unnecessary to buy four at once if you have not yet confirmed fit with your purifier.
The Bottom Line
The FFAC MA-25 Replacement Filter is a practical four-pack for MA-25 S1/W1/B1 owners who want an aftermarket filter with pre-filter, H13 HEPA, and activated carbon stages. Its strongest points are specific compatibility and multi-pack convenience, while its main limitation is that it is not a genuine Medify Air filter.
Choose it if you have verified your purifier model and are comfortable with compatible replacement parts. Skip it if original manufacturer filters or independently documented performance for this exact filter are priorities.
