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Actual Size: 15 1/2" x 24 1/2" x 3 5/8"
Free Delivery 
Factory-Direct Low Prices, Made in the USA
Hassle-Free Returns & Free Exchanges
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 15 1/2" x 24 1/2" x 3 5/8"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 15 1/2" x 24 1/2" x 3 5/8"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
If you are replacing a Honeywell 16x25x4 or 20x25x4, your Filterbuy replacement is a 5” filter.
The 5” Filterbuy replacement filter is trimmed down to the “actual” size of your original 4” Honeywell filter.
⚠️ Find your compatible filter by choosing one of the filters below. ⚠️
At Filterbuy, we don't cut corners—we craft high-quality air filters right here in the USA and ship them to your doorstep for free. No delays, no gimmicks—just clean air, made easy. With thousands of five-star reviews and filters built for real life & every HVAC system, it's no wonder why over 4 million families trust Filterbuy.
Proudly Made In The USA
Fast, Free Shipping on Every Order
Premium Materials That Go The Distance
85,000+ 5-Star Reviews From Happy Customers
Save Up to 70% Per Filter with Packs
Measure length × width × depth with a tape measure to find the actual size.
Round up each dimension to the nearest whole number to get the nominal size. Example: 15 1/2" x 24 1/2" x 3 5/8" in → 16x25x4 nominal.
Search by nominal size on our site for the best fit.
4″ filters offer better airflow and a longer life (6–9 months) than standard 1″ or 2″ filters — ideal for homes with pets or allergy concerns.
Sizing note:
If the filter you buy doesn't fit, we'll send you a better size.
MERV stands for Minimum Efficiency Reporting Value—but don't let the technical name fool you. It's just a way to rate how well an air filter traps stuff like dust, pollen, pet dander, and smoke. The higher the MERV number, the more particles it catches—and the cleaner your air will be.
Comparable to:FPR: 4-7
MPR: 600-1000
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Comparable to:FPR: 6-9
MPR: 1200-1550
Dust & DebrisDust Mites & ParticlesPollenMoldLintDander
Smoke & Smog
Comparable to:FPR: 10
MPR: 1900-2800
Dust & DebrisDust Mites & ParticlesPollenMoldLintDanderSmoke & Smog
Bacteria
We build every Filterbuy filter to deliver reliable 90-day performance—thanks to smart design and premium materials that do the heavy lifting. Here's what makes the difference:
More pleats = more surface area to capture dust and debris, keeping your air cleaner longer.
Pleats are magnetized to attract and trap microscopic particles—like pet dander, pollen, and smoke.
Engineered to resist warping in extreme temperatures and high humidity.
A layer of metal reinforcement keeps pleats evenly spaced and structurally sound—no sagging, even at high airflow.
Assembled with care. Built to perform. Ships fast, free, and reliably from our U.S. facilities.
Turn Off Your HVAC SystemSafety first.
Remove The Old FilterLook for the airflow arrow and make note of the direction.
Slide In Your New FilterArrow should point toward the system (same direction as before).
Turn Your System Back OnAnd enjoy the fresh, clean air.
Not all air filters are created equal. Pleated filters don't just last longer—they actually clean your air better. Here's how they stack up:
Efficiency:
High (MERV 8–13) – Traps more particles
Lifespan:
90 days – Long-lasting performance
Air Quality:
Excellent – Cleaner, healthier air
Materials:
Recyclable and durable
Efficiency:
Low (MERV 4 or less) – Misses small stuff
Lifespan:
30 days or less – Replace often
Air Quality:
Minimal – Basic protection only
Materials:
Thin, flimsy, and not recyclable
Pleated filters are a no-brainer—more protection, less hassle, and better air for your home.
Changing your filter on time keeps your HVAC system running efficiently—and helps protect your lungs from dust, allergens, and airborne irritants. Here's how often to swap it out based on your needs:
For most homes without pets or special air quality concerns. Great for general upkeep and energy efficiency.
Shedding fur, dander, and allergy triggers can build up fast. Changing your filter every two months helps keep the air fresher and symptoms at bay.
For households affected by smoke, pollution, or respiratory conditions, monthly changes ensure maximum protection.
| Nominal Size | 16 x 25 x 4 inches |
| Actual Size | 15 1/2" x 24 1/2" x 3 5/8" inches |
| Filter Type | Pleated |
| Media | Electrostatically Charged |
| Frame | Beverage Board |
| MERV Ratings Available | 8, 11, 13 |
| Lifespan | Up to 12 Months |
| Origin | Made in USA |
Filterbuy 16x25x4 MERV 11 air filters are the best! They're MERV 11 rated and they'll trap many types of particles.
Save with discount codes and bulk buys. These filters reduce HVAC strain and improve energy efficiency.
Subscribe to Filterbuy email newsletters for special discount codes.
Bulk purchase Filterbuy 16x25x4 MERV 11 filters to reduce costs per unit.
Check for ongoing seasonal promotions on Filterbuy air filters.
Maintain and replace filters regularly to make your HVAC live longer. This ensures long term savings.
MERV means Minimum Efficiency Reporting Value. This rating shows how efficient an air filter is. Filters with MERV 11 rating traps small particles. It's great for households with allergies. This filter traps 95% of particles in the air like:
Regular replacement and monitoring are important. This maintains air quality and efficiency.
Cleaning your filter improves air quality. A dirty filter strains your HVAC, increasing energy use and costs. Regular maintenance saves money and extends filter life.
Replacement Schedule - Change air filter every 60 to 90 days. Homes with pets and allergies need to change them more often.
Keep Extras on Hand - Always have spare filters available to avoid unexpected issues.
Ensure Proper Fit - Make sure there are no gaps in the filter's fit. This maintains effectiveness while avoiding damages.
Filterbuy 16x25x4 MERV 11 pleated air filters are designed with simplicity and efficiency. This user-friendly approach makes them easy to maintain. This focus on practicality sets Filterbuy filters apart from competitors, offering a convenient and hassle-free experience for all users.
You might be surprised how easy it is to save on Filterbuy 16x25x4 MERV 11 pleated air filters near you!
Keep an eye out for discount codes, often released through Filterbuy websites and newsletters. Signing up can lead to significant savings, making replacements more affordable.
Consider purchasing in bulk. Larger quantities often result in lower prices per item. Filterbuy offers discounts on bulk orders of their furnace 16x25x4 MERV 11 pleated air filters. This option suits those with multiple HVAC systems or those looking to stock up.
Top air filters like those from Filterbuy improve health and indoor air quality. We offer free shipping straight to your door. All our filters are proudly made here in the USA. Materials are made with the highest quality. We're proud of the products with over 85,000 5 star reviews from happy customers.
Here are more reasons why choose Filterbuy:
Better Indoor Air Quality: Greater pollutant capture means cleaner, fresher air.
Better Efficiency: Longer-lasting, smoother, and efficient.
Health Benefits: Blocks harmful particles like dust and mold. Reducing allergies and respiratory issues.
Cost-Effective: Higher cost, but less bills and replacements.
Easy to Maintain: Less frequent changes, saving time and effort.
A MERV 11 filter is not really too high for residential since it always comes recommended in homes. The wide range of particles, including pet dander, dust mites, pollen among others, is highly captured; thus, it improves indoor air quality significantly.
No. A MERV 11 filter is not too restrictive. It provides a higher level of filtration. Compared to lower MERV-rated filters. Which is excellent for removing more particles from the air. But it may cause an increased load on your HVAC system. If it's not designed to handle such filters.
MERV 11 filters are considered good for residential applications since they provide an ideal balance between particle filtration efficiency and airflow. It can capture particles as small as 1.0 to 3.0 microns in size. Thus being suitable for improving indoor air quality by removing allergens along with other contaminants.
The only downside with high MERV filters is that they can potentially choke the airflow if your HVAC system is not designed to pull in the extra resistance. This will drop the efficiency and may overwork the system. It is necessary to make sure that your HVAC system is compatible with higher MERV ratings before upgrading your filter.
MERV ratings between 8 and 11 are the best that provide a balance of good filtration with optimum airflow in residential settings. The ratings will offer adequate filtration to enhance indoor air quality without overly restricting airflow.
The highest rating generally recommended for residential use is MERV 13. A filter of this rating is capable of capturing very small particles, a portion of bacteria, and virus carriers; however, they may also create a considerable hindrance to airflow if the HVAC system is not designed for such a filter.
MERV 11 filters are normally good for 3 to 6 months. Their length may be determined by such things as air quality, household size and pets. It is important to note that one should check the filter more often and change it when necessary for optimal performance and air quality.
Thicker air filters are not inherently bad for HVAC systems, but they do create more resistance to flow. If a system is not designed to take a thicker filter, the system will have lowered efficiency and increased wear. Always check the specifications of your HVAC system for any recommendations about using a thicker filter.
HEPA filters are much more effective at catching extremely small particles, such as those that can transport bacteria and viruses. However, these HEPA filters also significantly impede airflow, and generally are not suggested for use in standard residential HVAC systems without modifications. MERV filters, rated between 8 and 13, offer a good balance for most homes.
Yes. You can use a MERV 11 filter in your house. Provided your HVAC is compatible with this level of filtration. MERV 11 filters are effective at capturing a wide range of particles and thus can help improve indoor air quality with minimal restriction to airflow in most residential systems.
Smaller smoke particles can be captured partly by MERV 11 filters, but not as effectively as would be captured by higher-rated filters or filters specifically designed to remove smoke. If filtration of smoke is desired, one may have a better option in using a MERV 13 filter or an independent air purifier with a HEPA filter.
Yes. MERV 11 filters are good for allergies since they capture a significant amount of common allergens: pet dander, pollen and dust mites. With the use of a MERV 11 filter, allergic reactions can be reduced. General indoor air quality can be improved.
