




Tip: Ensure you buy the exact air filter size for your system. Certain brands have precise dimensions that only fit their specific models. See related filters
Honeywell 20x20x5 MERV 11 Replacement Filter
Actual Size: 19.63x19.88x4.38
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months





Tip: Ensure you buy the exact air filter size for your system. Certain brands have precise dimensions that only fit their specific models. See related filters
Honeywell 20x20x5 MERV 11 Replacement Filter
Actual Size: 19.63x19.88x4.38
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months





Tip: Ensure you buy the exact air filter size for your system. Certain brands have precise dimensions that only fit their specific models. See related filters
Honeywell 20x20x5 MERV 11 Replacement Filter
Actual Size: 19.63x19.88x4.38
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
About
- This is a list 20x20x5 MERV 11 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
- Actual air filter size: 19.63x19.88x4.38
- MERV 11 synthetic media (comparable with MPR 1000/1200 and FPR 7) offers superior protection from dust, pollen, pet dander, mold, smog and more by trapping 95% of airborne particles without impacting air flow
- High-quality construction means electrostatically charged pleated filter media, reinforced wire backing for structural integrity, and a durable frame to resist heat and humidity
- Built to last 3 months. 300% longer than fiberglass models
- 100% manufactured in the United States and designed with recyclable materials
- Learn more about 20x20x5 Air Filters
Top-Rated Filters. American Made. Delivered Free.
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
Things to Know About Filter Sizes

Nominal Size
- The rounded size printed on your filter or HVAC unit (e.g., 20x20x5).
- Usually whole numbers to make identifying and ordering easier.
- A label for compatibility—not the exact measurement.

Actual Size
- The true, trimmed dimensions of the filter (e.g., 19.63x19.88x4.38 inches).
- Filters are manufactured slightly smaller so they slide into the filter slot without forcing.
- If you don't know your nominal size, measure your filter to get the actual size, then round up to find the nominal size to search on our site.
Why the difference?
- Nominal sizes simplify shopping and standardize categories.
- Actual sizes ensure the filter fits properly inside your HVAC's filter rack.
How To Find Your Nominal Size When You Don't Know It


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: 19.63x19.88x4.38 in → 20x20x5 nominal.

Search by nominal size on our site for the best fit.
Why Getting the Right Size Matters
- Too small? Air can bypass the filter, reducing air quality and efficiency.
- Too big? It won't fit—risking bent frames and airflow issues.
- Just right? You get maximum performance, better filtration, and cleaner air.

Why Choose a 5″ filter

5″ filters give you maximum filtration with minimal maintenance — lasting up to 12 months while handling higher MERV ratings without restricting airflow.
Sizing note:
- Requires a 5″ cabinet or system.
- Actual thickness varies by brand (~4¾″–5¼″), so check your model for the best fit.

Free Exchange Policy
If the filter you buy doesn't fit, we'll send you a better size.
What's a MERV Rating?
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.

Merv 8
Comparable to:FPR: 4-7
MPR: 600-1000
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Merv 11
Comparable to:FPR: 6-9
MPR: 1200-1550
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Smoke & Smog
Merv 13
Comparable to:FPR: 10
MPR: 1900-2800
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Smoke & Smog
Bacteria
MERV 8
Comparable to:FPR: 4-7MPR: 600-1000






MERV 11
Comparable to:FPR: 6-9MPR: 1200-1550







MERV 13
Comparable to:FPR: 10MPR: 1900-2800







What Makes Our Filters Last 90 Days? Quality, From the Inside Out
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:
Pleated Design
More pleats = more surface area to capture dust and debris, keeping your air cleaner longer.
Electrostatically Charged Media
Pleats are magnetized to attract and trap microscopic particles—like pet dander, pollen, and smoke.
Synthetic Beverage Board Frame
Engineered to resist warping in extreme temperatures and high humidity.

Aluminum Dual Wire Backing
A layer of metal reinforcement keeps pleats evenly spaced and structurally sound—no sagging, even at high airflow.
Made in the USA
Assembled with care. Built to perform. Ships fast, free, and reliably from our U.S. facilities.
How to Install Your Filter in 4 Simple Steps

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.
Never forget to replace your air filter again.
- Save 5% on every order
- Choose Your Delivery Schedule
- Edit, Skip, or Cancel Anytime.
Pleated Filters vs. Fiberglass—What's the Difference?
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:

Pleated Filters
Efficiency:
High (MERV 8–13) – Traps more particles
Lifespan:
90 days – Long-lasting performance
Air Quality:
Excellent – Cleaner, healthier air
Materials:
Recyclable and durable

Fiberglass Filters
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.
How Often Should You Change Your Filter?
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:

Every 90 Days
Standard ScheduleFor most homes without pets or special air quality concerns. Great for general upkeep and energy efficiency.

Every 60 Days
If You Have Pets or AllergiesShedding fur, dander, and allergy triggers can build up fast. Changing your filter every two months helps keep the air fresher and symptoms at bay.

Every 30 Days
If You Have Respiratory Concerns or Live in Smog/Wildfire ZonesFor households affected by smoke, pollution, or respiratory conditions, monthly changes ensure maximum protection.
Want to stay on track? Set a reminder—or skip the stress with auto-delivery so fresh filters show up right when you need them.
Don't Just Take Our Word For It...
Got More Questions? We've Got Answers.
Product Specifications
| Nominal Size | 20 x 20 x 5 inches |
| Actual Size | 19.63 x 19.88 x 4.38 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 |
Why Choose Filterbuy Honeywell 20x20x5 MERV Air Filters?
You may already be aware of the health benefits of clean air. Ever pondered the part your air filters contribute to this? Well, if you're employing Filterbuy Replacement Honeywell 20x20x5 MERV air filters, you're on a great track.
Boasting a MERV rating, these filters excel at snaring minute particles. Their generous dimensions further enhance their ability to ensnare pollutants.
However, these filters are not just about size and particle-capturing ability. What distinguishes them from the masses, don't you find yourself wondering?
Key Takeaways
With a MERV 11 rating, Filterbuy Honeywell 20x20x5 filters guarantee outstanding indoor air quality.
Larger in size, these filters capture a high amount of pollutants, thus promoting HVAC system efficiency.
Allergens are no match for these filters as particles as tiny as 3 microns get trapped.
Durability is another hallmark of Filterbuy Honeywell filters, ensuring less frequent replacement needs.
These filters provide unparalleled value for money by fusing affordability with environmental sustainability.
Benefits of Honeywell Replacement Air Filters
Filterbuy Replacement Honeywell 20x20x5 air filters provide many advantages for keeping a healthy space in your home. You'll immediately notice improved air quality and better HVAC system performance.
Cleaner Air – Filterbuy Honeywell 20x20x5 MERV 11 filter captures dust, lint, debris, mold, pollen, pet dander, dust mites and auto emissions. It makes sure they do not collect on your evaporator coil, in your furnace, or air ducts.
Better Performance – A clean and well-kept filter reduces strain on your heating and cooling devices. As a result, it lowers energy use and cuts power bills.
Long-Lasting Durability – These filters outlast many competitors, requiring fewer replacements and offering long-term savings.
For better air quality, increased efficiency, and overall value, Filterbuy Replacement Honeywell 20x20x5 MERV air filters are a wise selection.
The 20x20x5 Size: Why It Matters
There are many benefits of Honeywell replacement filters from Filterbuy. Just make sure to choose the right size when it comes to replacing your filters for the sake of your HVAC system.
Optimal Filtration: An ill-fitting filter allows contaminants to escape filtration, reducing indoor air quality.
System Efficiency: Filters that are too small or improperly installed can let particles bypass, leading to HVAC strain and potential damage.
Enhanced Surface Area: The 5-inch depth provides a larger surface area. This allows better airflow and improved particle capture.
Extended Lifespan: Thicker filters like the 20x20x5 pleated filter last longer. It needs fewer replacements and offers cost savings over time.
Choosing the right filter size ensures optimal HVAC performance and cleaner indoor air. Filterbuy offers a comprehensive guide on measuring your air filter correctly. If your size isn’t standard, custom-size filters are available for a perfect fit.

Filterbuy Honeywell’s Superior Air Quality
Filterbuy 5-inch replacement filters are designed to deliver crisp, clean indoor air. It’s like a breath of fresh mountain air.
Efficient & Clean – These filters trap dust, pollen, and mold. This helps to reduce energy use and lower carbon emissions.
Advanced Design – The pleated surface helps catch more particles. The strong build makes the filters last up to three times more than regular fiberglass filters.
Choosing Filterbuy Honeywell replacement filters ensures superior air quality and a more eco-conscious lifestyle—now that’s refreshing.
Cost and Lifespan Advantages
Filterbuy Honeywell 20x20x5 MERV air filters offers great value. These filters save you money over time by lasting longer and reducing the need for frequent replacements.
Consider a high-quality winter coat analogy. A cheap coat needs replacing every year, but a good one lasts for many winters. Honeywell’s filters work the same way. They’re made to last. This also means giving you long-term savings.
The long lifespan means fewer trips to the store and less time spent on changing filters. This lets you enjoy clean air without the hassle.
Why Choose Filterbuy Air Filters?
Filterbuy offers high-performance filters that enhance air quality and HVAC efficiency. With a focus on quality and convenience, they ensure you get the best value for your filtration needs.
Key Benefits:
Fast order processing with nationwide shipping
Affordable subscription service for regular deliveries
100% American-made filters
Easy installation with clear instructions
Filters that last up to 3x longer than fiberglass alternatives
Filterbuy Replacement Air Filters offer a variety of sizes, thicknesses, and MERV ratings. This ensures you can find the right filters for residential, commercial, or industrial use.
Frequently Asked Questions
How often should you change a MERV 11 furnace filter?
Change it every 3 to 6 months. If you have pets, allergies, or live in a high pollen area, change it more often for better airflow and cleaner air.
Is a MERV 11 filter too restrictive?
A MERV 11 filter is not too restrictive for most modern HVACs. It balances between filtering out smaller particles and maintaining proper airflow. If your HVAC is older or struggles with airflow, it’s best to check its capacity.
Can I replace MERV 11 with MERV 12?
Yes. But ensure your HVAC handles the increased filtration. MERV 12 offers finer filtration. They slightly reduces airflow. Verify that your system is compatible with the higher rating.
What does MERV 11 mean on a furnace filter?
MERV 11 indicates that the filter can capture smaller particles such as dust, pollen, mold spores, and pet dander. It’s ideal for homes with pets or people with allergies. The higher the MERV rating, the better the filter is at trapping airborne particles.
Can high MERV filter damage my furnace?
A high MERV filter can damage your furnace if it restricts airflow too much. This causes the system to work harder. This can lead to higher energy bills and potential system strain. Always check if your furnace is designed to handle higher MERV ratings before installing one.
How can I tell if my furnace filter needs changing?
Your furnace filter needs changing if it looks dirty, clogged or discolored. Also, change it if airflow is weak or your system runs constantly.
What MERV rating is best for airflow?
MERV ratings between 8 and 11 are best for maintaining good airflow in residential systems. They provide effective filtration while ensuring the system operates efficiently without too much strain on airflow.
Are thicker air filters bad for HVAC?
Thicker air filters are not necessarily bad for HVACs. But they can restrict airflow if HVAC isn't designed for them. Thicker filters offer better filtration and last longer. But it's vital to ensure your system can handle the increased thickness.
Do pleated air filters restrict airflow?
Pleated air filters can slightly restrict airflow. But they offer better filtration than non-pleated filters. Most modern HVACs are designed to handle pleated filters without significant issues. Always ensure your system can support pleated filters to avoid reduced efficiency.
Is MERV 12 too high for home?
MERV 12 is not too high for home use. Especially if you have concerns like allergies or want better filtration of fine particles. It can improve air quality by capturing smaller particles. Ensure your HVAC can handle the increased filtration level to avoid restricted airflow.
What is a good MERV level for a house?
A good MERV level for a house is between 8 and 11. This range provides solid filtration for common household particles like dust, pollen and pet dander. All while maintaining efficient airflow in most residential HVACs.
What is equivalent to MERV 11?
MERV 11 is equivalent to FPR 7 (Filter Performance Rating) or MPR 1000-1200 (Microparticle Performance Rating). These ratings also provide good filtration for small particles and allergens, making them ideal for homes with pets or allergy concerns.
