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Actual Size: 19.63x24.38x4.75"
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Factory-Direct Low Prices, Made in the USA
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RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 19.63x24.38x4.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 19.63x24.38x4.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
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 Your Brand Below:
Find Your Exact Match By Choosing the Actual Size (Also known as the trimmed size):
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: 19.63x24.38x4.75" in → 20x25x5 nominal.
Search by nominal size on our site for the best fit.
5″ filters give you maximum filtration with minimal maintenance — lasting up to 12 months while handling higher MERV ratings without restricting airflow.
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 | 20 x 25 x 5 inches |
| Actual Size | 19.63 x 24.38 x 4.75" 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 |
Want cleaner air? Don’t neglect to change your air filters!
Getting the right tools to ensure a perfect fit is something to look out for. Let's examine the benefits of this routine maintenance for both the general health of your house and your HVAC system.
Begin by turning off your HVAC system before commencing the filter replacement process.
Remove the old filter and note the indicated airflow direction.
Verify that you have the right filter, ensuring it matches the dimensions of the previous one.
Place the Filterbuy 20x25x5 MERV 11 Generalaire replacement filter following the same airflow direction as indicated.
Switch your HVAC system back on, planning regular assessments for optimum performance.
Air filters not only trap dust but they help keep the air in your home clean. Ignoring air quality leads to health issues, allergies and breathing problems. Air filters remove harmful particles. They improve the air in your home by acting as guards and protection from dust and allergens.
Clean and efficient air filters help stop the spread of bacteria and viruses. Giving you peace of mind during flu season.
Filterbuy pleated air filters are 20 times more effective than standard fiberglass filters. These filters have a sturdy beverage board frame that withstands humidity and temperatures up to 200°F without warping or weakening.
We use a special synthetic electrostatic media for better filtration. This is far more effective at capturing particles than the basic cotton media in other filters.
Generalaire 20x25x5 MERV 11 replacement filter is a great choice for allergy sufferers. It filters out unwanted particles, capturing almost 95% of them.
Changing Generalaire replacement filter 20x25x5 MERV 11 is not a time-consuming task. User-friendly design coupled with compatibility across diverse HVAC systems contributes to this convenience.
Turn off your HVAC system for safety. Find your current filter which is usually located near the unit. Carefully remove it while observing the airflow arrows on the frame. Don’t throw it away just yet!
Compare the old filter with the new one to ensure they have the same dimensions.
Align the filter with the airflow direction indicated on the frame.
Insert the new filter, making sure it fits snugly. If it’s loose, double-check the size.
Once secure, turn your HVAC system back on. Great job—you’re all set to enjoy cleaner air!
With your new filter in place, it’s time for upkeep. Regular maintenance keeps it efficient, extends its life, and helps reduce energy use, saving you money.
Here are three key tips for maintaining your filter:
Check the filter monthly. Clean washable filters properly. This avoids mold and mildew. Rinse washable filters with warm water and let them fully dry.
As recommended, replace the filter every 60 to 90 days. But when it comes to households with pets or individuals with allergies may need more frequent replacements.
If there’s an issue with your system, the filter won’t work as effectively.
These simple steps may seem small, but they greatly extend your filter’s lifespan and efficiency. Keep up the maintenance and enjoy the fresh air.
At Filterbuy, we believe in better air for everyone. Our top-quality air filters improve health and indoor air quality while maintaining efficiency for a healthier environment.
Here are the benefits:
Better Air Quality: Captures more pollutants for cleaner, fresher air.
Better Efficiency: Longer-lasting and more efficient.
Health Benefits: Blocks dust, mold, and other particles, reducing allergies and respiratory issues.
Cost-Effective: Higher upfront cost, but fewer bills and replacements.
Easy to Maintain: Less frequent changes, saving you time and effort.
A 20x25x5 air filter can last anywhere from 6 to 12 months. Depending on factors including air quality, system usage and pet or allergy status. Make sure the filter isn't clogged by checking it every few months, and replace it as needed.
A MERV 11 air filter should be changed every three to six months. Depending on usage and air qualit. If you live in a dusty location, have pets or have allergies, you may need to replace it more frequently. This ensures maximum filtration and airflow.
Yes. It's OK to use a MERV 11 filter in most homes. It provides good dust, pollen, and pet dander filtration while retaining decent airflow in most HVAC systems. However, always check if your system can tolerate this amount of filtration.
MERV 11 refers to the filter’s ability to capture smaller particles like dust, pollen, mold spores and pet dander. It offers a good balance of filtration and airflow, making it a solid choice for homes with pets or allergies.
No. Not all 20x25x5 filters are the same. While they may share dimensions, their MERV ratings, materials and filtration capabilities vary. Always check the MERV rating and manufacturer’s specifications to ensure you’re getting the right filter for your system.
You can tell if your furnace filter needs changing by inspecting it for dust and debris buildup. If it looks clogged or dirty, it’s time for a replacement. Reduced airflow or increased energy bills are signs that your filter is overdue for a change.
If your furnace is having trouble maintaining airflow even with a MERV 11 filter, you may want to use a lower MERV rating to avoid putting too much pressure on the system. MERV 11 may be too restrictive for some older furnaces since it can reduce airflow.
The main drawback of using a high MERV filter is that it can restrict airflow. Especially in systems not designed for it. This can cause your HVAC system to work harder. This reduces efficiency and potentially leading to higher energy costs.
One disadvantage of the highest MERV-rated filters is that they can significantly reduce airflow. This causes your HVAC system to strain. This leads to increased wear on your system and higher energy bills if the system isn't designed for high-efficiency filters.
For most homes, a MERV rating of 8 to 11 is ideal because it blends effectively filtration and airflow management by capturing airborne particles while allowing your system to operate at peak efficiency.
Yes. There is a difference between MERV 11 and MERV 13. MERV 13 captures smaller particles like bacteria and smoke, providing higher filtration. However, MERV 13 may restrict airflow more than MERV 11, so check if your system can handle it.
While MERV 11 is not as effective as higher-rated filters like MERV 13. It can still filter out some smoke particles. Use a filter with a MERV value of 13 or above for superior smoke filtration.
