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Honeywell 20x25x5 MERV 11 Replacement Filter

 

Actual Size: 19.88x24.75x4.38"

$157.44$26.24/ea
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Superior
Superior

RESIDENTIAL AND/OR COMMERCIAL USE

Change Every 3 Months

About

  • This is a list 20x25x5 MERV 11 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
  • Actual air filter size: 19.88x24.75x4.38"
  • 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 20x25x5 Air Filters
Quantity

Important Whole House 5” Filter Compatibility note

Many HVAC brands have unique trimmed sizes of their 20x25x5 filters.
For example, a 20x25x5 made for Honeywell systems will not fit other brand systems.

⚠️ This quick step can save you from ordering the wrong size. ⚠️



Find Your Exact Match By Choosing the Actual Size (Also known as the trimmed size):

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.

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Proudly Made In The USA

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Things to Know About Filter Sizes

Finger pointing to nominal size

Nominal Size

  • The rounded size printed on your filter or HVAC unit (e.g., 20x25x5).
  • Usually whole numbers to make identifying and ordering easier.
  • A label for compatibility—not the exact measurement.
Finger pointing to actual size

Actual Size

  • The true, trimmed dimensions of the filter (e.g., 19.88x24.75x4.38" 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.
Help icon

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

Air Filter Explaining Each Size
Nom 20"Act 19.88"
Nom 5"Act 4.38"
Nom 25"Act 24.75"
1

Measure length × width × depth with a tape measure to find the actual size.

2

Round up each dimension to the nearest whole number to get the nominal size. Example: 19.88x24.75x4.38" in → 20x25x5 nominal.

3

Search by nominal size on our site for the best fit.

Help icon
Pro tips: If your filter is missing or damaged, measure the filter slot opening the same way.

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

Air Filter 5 inch

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

Free Exchange Policy

If the filter you buy doesn't fit, we'll send you a better size.

Need a Non-Standard Size?

Need a Non-Standard Size?

Build a custom filter in just a few clicks.

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.

Swipe To See More
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Smoke & Smog
Bacteria
Odors
MERV 8

MERV 8

Comparable to:FPR: 4-7MPR: 600-1000



MERV 11

MERV 11

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


MERV 13

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.

Air Filter Wit Zoom In Key Features

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

How to install your filter - Step 1 - Return Vent

Turn Off Your HVAC SystemSafety first.

How to install your filter - Step 2 - Filter Housing

Remove The Old FilterLook for the airflow arrow and make note of the direction.

How to install your filter - Step 3 - Filter Housing

Slide In Your New FilterArrow should point toward the system (same direction as before).

How to install your filter - Step 4 - Filter Housing

Turn Your System Back OnAnd enjoy the fresh, clean air.

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Never forget to replace your air filter again.

  • Save 5% on every order
  • Choose Your Delivery Schedule
  • Edit, Skip, or Cancel Anytime.
Learn More

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 Filter

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 Filter

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:

Calendar Illustration Every 90 days

Every 90 Days

Standard Schedule

For most homes without pets or special air quality concerns. Great for general upkeep and energy efficiency.

Calendar Illustration Every 60 days

Every 60 Days

If You Have Pets or Allergies

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.

Calendar Illustration Every 30 days

Every 30 Days

If You Have Respiratory Concerns or Live in Smog/Wildfire Zones

For households affected by smoke, pollution, or respiratory conditions, monthly changes ensure maximum protection.

Help icon
Final tip:
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 Size20 x 25 x 5 inches
Actual Size19.88 x 24.75 x 4.38" inches
Filter TypePleated
MediaElectrostatically Charged
FrameBeverage Board
MERV Ratings Available8, 11, 13
LifespanUp to 12 Months
OriginMade in USA

Filterbuy 20x25x5 MERV 11 Honeywell Replacement Filter Delivers Superior Indoor Air Quality

Filterbuy 2025x5 MERV 11 Honeywell replacement filter improves your indoor air quality. This filter gives cleaner and purer air to your place. Filterbuy’s filter also reduces the dust and allergies. Investing in this amazing product brings many health benefits and extends HVAC life.

How cost-effective does it prove? Are there extra benefits worth noting?

Let's examine these aspects to learn the real value of Filterbuy air filters Honeywell 20x25x5 MERV 11 replacement filter.

Key Takeaways

Filterbuy 20x25x5 MERV 11 Honeywell Replacement Filter Overview

This filter is an amazing option to improve the quality of the air indoors. Its huge range of particle-trapping abilities make sure the air is cleaner, fresher, and healthier in your house.

Regular maintenance ensures your filter’s performance is at the top. Check the filter monthly, and replace it if it’s dirty. Stick to a strict three-month replacement schedule. This commitment not only prolongs HVAC lifespan. But also guarantees consistent and clean air quality indoors.

Breathe easy! Filterbuy’s Honeywell 20x25x5 MERV 11 replacement filter diligently works for your well-being.

Advantages of Using MERV 11 Filters

Using MERV 11 filters gives many advantages. Noticeable improvements in air quality result from these filters. They capture a lot of harmful particles in the air.

Reducing dust benefits not only lungs but also furniture and floors. Spaces become healthier. This is very useful for people with allergies or those with pets.

Additionally, these filters boost HVAC system efficiency, which extends lifespan. Breathing becomes easier, while future repair or replacement costs decrease.

MERV 11 filters, like those offered by Filterbuy, are a valuable investment in health and finances.

Tips for Potential Savings With Filterbuy Filters

Breathe easier and keep expenses manageable with Filterbuy filter. You will not only save money but it also maintains high indoor air quality.

How to change Air Filters

Regularly replacing the air filter protects both your health and budget. You don’t need to become an expert to change your Filterbuy air filter.

Changing your filter is simple:

  1. Turn off your HVAC system for safety.

  2. Locate the filter slot, often near the air return vent or the furnace.

  3. Remove the old filter, noting the direction of the airflow arrows.

  4. Slide the new filter in. Ensure the airflow arrows are pointing in the correct direction.

Replace your Filterbuy air filter every 1-3 months. Or more often if you have pets and allergies.

View of a happy woman inspecting a high-quality 20x25x5 MERV 11 FilterBuy air filter for indoor air quality.

Why choose Filterbuy?

We believe in better air for all. We’re passionate about providing clean air for every home. We offer air filters in every size imaginable. Including hard to find custom options.

We offer fast and free shipping. Our filters are proudly made here in the USA. We use the highest quality American made materials. We're proud of the products we sell. With over 65,000 5-star reviews from happy customers.

Frequently Asked Questions:

Is Merv 11 too high for HVAC?

A MERV 11 filter is not too restrictive for most residential HVAC systems. They effectively filter out small particles. Without reducing air flow. Or making your HVAC system work overly hard.

Do I really need a Merv 11 filter?

Whether you need a MERV 11 filter or not depends on your needs. 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 if it's not designed to handle such filters.

How often should Merv 11 be changed?

Change your MERV 11 filter every 3 to 6 months. Factors like your home's dust levels, the presence of pets and your HVAC's usage influence how often you need to replace it. It might be time for a change if you notice reduced airflow or increased dust accumulation. Regularly checking your filter is a good practice to ensure optimal performance.

Are all 20x25x5 air filters the same?

Not all 20x25x5 air filters are the same. They vary in terms of MERV rating, material and filtration capabilities. While the dimensions may be identical, the effectiveness of the filters differs greatly. Always consider the MERV rating and the specific needs of your HVAC when selecting a filter.

Is there a downside to high MERV filters?

Higher MERV filters can restrict airflow. The filter's weave becomes tighter as the MERV rating increases. It’s harder for air to pass through. This causes your HVAC to work harder.

Can I replace MERV 11 with MERV 12?

You can replace a MERV 11 filter with a MERV 12 filter. Provided your HVAC can handle the increased filtration. MERV 12 filters capture smaller particles. This improves indoor air quality even further. However, it's important to monitor your unit's performance as higher-rated filters may restrict air flow if your HVAC can’t accommodate them.

Will MERV 11 restrict air flow?

MERV 11 filters restrict airflow more than lower-rated filters. But they are designed to balance filtration efficiency with airflow. If your HVAC is well-maintained and designed to handle a MERV 11 filter, you shouldn't experience significant airflow issues. Regularly checking your HVAC's performance helps you identify any potential problems related to air flow.

What MERV rating is best for airflow?

MERV ratings between 8 and 11 are considered ideal for maintaining good airflow while providing adequate filtration. These ratings effectively capture dust, pollen and pet dander without creating excessive resistance in your HVAC. The best MERV rating for airflow also depends on your specific HVAC and its design capabilities.

Is there a big difference between MERV 11 and 13?

Yes. There is a noticeable difference between MERV 11 and MERV 13 filters. MERV 13 filters capture smaller particles. Including some bacteria and respiratory droplets. This makes them more effective in improving air quality. They also restrict airflow more than MERV 11 filters. So it's important to ensure your HVAC can handle the higher MERV rating before making a switch.

How often should I change my 20x25x5 furnace filter?

Change your 20x25x5 furnace filter every 3 to 6 months. Depending on your specific conditions. Factors such as the number of occupants, pets and overall dust levels in your home affect how quickly the filter becomes clogged. Regularly checking the filter will help maintain optimal airflow and efficiency in your HVAC unit.

Can I use 20x25x4 instead of 20x25x5?

Using a 20x25x4 filter instead of a 20x25x5 is not recommended. The dimensions and thickness are different. A 20x25x5 filter is designed to fit into a specific slot in your HVAC. And a thinner filter may not create a proper seal, leading to bypassed air and reduced filtration efficiency. Always use the correct size filter for your unit to maintain optimal performance.

Does MERV 11 filter out mold?

Yes. MERV 11 filters help filter out mold spores from the air. They are effective at capturing particles in the size range of mold spores. Which improves indoor air quality. If mold is a significant concern in your home, consider using a filter with a higher MERV rating or additional air purification methods to address the issue more effectively.