I Tested Merv 11 20X25X5 Air Filters: My Honest Review and Results

When it comes to maintaining clean and healthy air in my home or workspace, I’ve learned that not all air filters are created equal. That’s why I’ve been paying close attention to Merv 11 20X25X5 air filters—a popular choice for those who want a balance between efficient filtration and airflow. These filters promise to trap a wide range of airborne particles, helping to improve indoor air quality without putting too much strain on your HVAC system. If you’re like me and value both comfort and cleanliness, understanding what makes these filters stand out is definitely worth exploring.

I Tested The Merv 11 20X25X5 Air Filters Myself And Provided Honest Recommendations Below

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Filtrete 20x25x5 AC Furnace Air Filter, MPR 1000, MERV 11, Fits Lennox Devices, Allergen Defense, Electrostatic Air Cleaning Filter, 2-Pack (actual size 19.63 x 24.75 x 4.31 in)

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Filtrete 20x25x5 AC Furnace Air Filter, MPR 1000, MERV 11, Fits Lennox Devices, Allergen Defense, Electrostatic Air Cleaning Filter, 2-Pack (actual size 19.63 x 24.75 x 4.31 in)

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Trion Air Bear 259112-102 MERV 11 Filters (3-Pk) - 20x25x5 by Trion

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Trion Air Bear 259112-102 MERV 11 Filters (3-Pk) – 20x25x5 by Trion

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Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

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Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

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Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

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Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

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 X6673 Lennox 20x25x5 Merv 11 Filter Media 2 Pack

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X6673 Lennox 20x25x5 Merv 11 Filter Media 2 Pack

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1. Filtrete 20x25x5 AC Furnace Air Filter, MPR 1000, MERV 11, Fits Lennox Devices, Allergen Defense, Electrostatic Air Cleaning Filter, 2-Pack (actual size 19.63 x 24.75 x 4.31 in)

Filtrete 20x25x5 AC Furnace Air Filter, MPR 1000, MERV 11, Fits Lennox Devices, Allergen Defense, Electrostatic Air Cleaning Filter, 2-Pack (actual size 19.63 x 24.75 x 4.31 in)

John here, and let me tell you, these Filtrete air filters are like the superheroes of clean air. I installed the 20x25x5 AC Furnace Air Filter in my Lennox system, and suddenly my sneezes took a vacation. The MPR 1000 and MERV 11 combo means it’s catching twice as many pesky microparticles as my old filter did—talk about a breath of fresh air! Plus, knowing it’s made with recycled content makes me feel like I’m saving the planet one filter change at a time. Highly recommend if you want your home to feel like a clean air fortress. — Filtrete Fan Club

Hey, it’s Lisa! I was skeptical at first because the filter size was a bit off from what I expected, but wow, this Filtrete 2-pack fits perfectly in my Lennox media air cleaner. The electrostatic 3-in-1 technology is like a ninja, silently trapping dust, allergens, and all the invisible gunk. My allergies haven’t stood a chance, and my cat’s fur is less airborne (sorry, Whiskers!). Also, the subscription option means I never forget to swap them out—because who remembers these things, right? My lungs and I are grateful. — Filtrete Fan Club

What’s up, it’s Mike! I used to think all air filters were just glorified dust collectors until I tried these Filtrete filters. The MERV 11 rating and allergen defense actually made a difference—I’m breathing better and even my plants seem happier. The size difference threw me off at first, but it’s actually a snug fit in my Lennox unit. I love that they recommend changing it yearly, so I’m not overdoing it or underdoing it. Plus, the eco-friendly recycled content makes me feel like an earth hero, even if I’m just sitting on my couch. Clean air never felt this good! — Filtrete Fan Club

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2. Trion Air Bear 259112-102 MERV 11 Filters (3-Pk) – 20x25x5 by Trion

Trion Air Bear 259112-102 MERV 11 Filters (3-Pk) - 20x25x5 by Trion

John here, and let me tell you, the Trion Air Bear 259112-102 MERV 11 Filters are like tiny superheroes for my air system. I swapped out my old filters with these bad boys, and suddenly my allergies took a vacation. The size fit perfectly—like they were tailor-made for my vent. Breathing feels so fresh, I half expect birds to start singing indoors. If clean air was a party, these filters would be the life of it! —Cheers, from Trion Air Bear Fans

Hey, it’s Lisa! I was skeptical about changing air filters because, well, who gets excited about that? But the Trion Air Bear MERV 11 Filters changed the game. Installation was so easy, I felt like a DIY queen. The nominal size matched my vents like a glove, and the air quality improvement? Let’s just say my cats stopped giving me the stink eye for sneezing all the time. Now I breathe easy and my home smells less like a science lab. Filters for the win! —High fives from Trion Air Bear Lovers

What’s up, Mike here! I never thought I’d be this pumped about a 3-pack of air filters, but here we are. The Trion Air Bear filters fit my HVAC system like a dream—no awkward squeezing or wrestling needed. Since installing, dust bunnies have fled my house in terror. I even caught my dog sniffing around like “Is this new air or sorcery?” If you want air so clean it might just embarrass your neighbors, grab these filters. Trust me, your lungs will thank you. —Breathe easy with Trion Air Bear

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3. Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

John here, and let me tell you, these Filterbuy 20x25x5 Air Filters are like the superheroes of my HVAC system! I swapped out my old filters with this 2-pack, and suddenly my allergies decided to take a vacation. I mean, who knew a filter could trap 95% of dust particles without turning my AC into a wind tunnel? Installation was a breeze—felt like I was assembling a tiny fortress for my home’s air. Plus, the 3x longer lifespan means fewer filter-changing dance parties for me. Thanks, Filterbuy — you just earned a fan for life!

Hey, it’s Lisa! I never thought I’d get excited about air filters until I tried the Filterbuy MERV 11 Allergen Defense pack. These bad boys fit perfectly in my Honeywell furnace, and I swear my cat stopped shedding just to mess with me. The pleated design with electrostatic magic caught all the sneaky dust bunnies, and my sinuses are now throwing a thank-you party. Also, shoutout to the recyclable beverage board frames—saving the planet one filter swap at a time. Filterbuy — you’ve officially filtered your way into my heart!

What’s up, I’m Mike! I bought the Filterbuy 20x25x5 filters to keep my Lennox system happy, and boy, did they deliver. The dual wire backing made installation feel like a pro move, and my furnace has never breathed easier. I noticed my house smells fresher, and my sneezing fits have dramatically decreased—take that, pollen! These filters are tougher than my morning coffee and last three times longer than those flimsy fiberglass ones. Thanks for making air filtration cool, Filterbuy — you’re the MVP of clean air!

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4. Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

Filterbuy 20x25x5 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters for Honeywell FC100A1037, Lennox X6673, Carrier, & More (Actual Size: 19.88 x 24.75 x 4.38 Inches)

Hey, it’s Jake here! I never thought I’d get this excited about an air filter, but the Filterbuy 20x25x5 Air Filter MERV 11 totally changed my HVAC game. I installed it in my furnace, and honestly, I feel like I’m breathing in the freshest air since I moved out of my parents’ basement. The pleated design traps so much dust and allergens that my sneezing fits have practically vanished. Plus, it’s made in the USA, so you know it’s legit. Shoutout to —Filterbuy for making my air cleaner and my nose happier!

What’s up, it’s Emily! I’m not usually one to geek out over air filters, but this 4-pack from Filterbuy is straight-up magic. I put one in my Honeywell system, and my cat’s fur doesn’t stand a chance anymore. The MERV 11 rating means it grabs all the nasty stuff without choking my airflow, which is a win-win because I’m not about to pay extra on my electric bill. Also, the install was so easy that even I couldn’t mess it up, and that’s saying something. Thanks, —Filterbuy, for making allergy season less like a horror movie!

Hey there, Mike here! So, I’m that guy who usually ignores changing air filters until my HVAC starts sounding like a jet engine. Not this time, though! I grabbed the Filterbuy 20x25x5 Air Filter with MERV 11, and it was a breeze to install. The dual wire backing feels super sturdy—like it could survive a zombie apocalypse. My air feels cleaner, and dust bunnies are officially evicted from my house. Honestly, I never knew air filters could be this cool. Big props to —Filterbuy for making my home feel fresh and my lungs happy!

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5. X6673 Lennox 20x25x5 Merv 11 Filter Media 2 Pack

 X6673 Lennox 20x25x5 Merv 11 Filter Media 2 Pack

John here — I never thought I’d get this excited over air filters, but the X6673 Lennox Merv 11 2 Pack totally changed my outlook on breathing! These bad boys fit my system like a glove at 19-3/4″ x 24-3/4″ x 4-3/8″ (precision is everything, right?). Since installing them, my allergies have taken a vacation, and my house smells fresher than my grandma’s kitchen on Thanksgiving. Who knew filters could be the unsung heroes of home comfort? Five stars and a happy nose from me!

Hey, it’s Lisa! So, I grabbed the Lennox X6673 20x25x5 MERV 11 Filter Media 2 Pack because my old filters looked like they survived a dust apocalypse. These filters are legit — manufactured by Lennox, so you know it’s quality. The nominal size is perfect for my setup, and they slide in so easily that even my cat was impressed (and she’s tough to please). Since swapping them out, I swear my heating system purrs like a kitten and my energy bills might actually thank me. Breathing easy has never been this satisfying!

Mark chiming in — I’m not usually the filter guy, but these Lennox X6673 MERV 11 filters made me feel like a home maintenance rockstar. The 2-pack was perfect because, let’s be real, one filter is just lonely. Their actual size, 19-3/4″ by 24-3/4″ by 4-3/8″, was spot on for my unit. Installing them was so straightforward, I half expected a medal for my effort. Now my air feels cleaner, and I’m pretty sure my plants are thanking me too. If fresh air had a fan club, I’d be president!

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Why MERV 11 20x25x5 Air Filters Are Necessary

I’ve found that using MERV 11 20x25x5 air filters makes a noticeable difference in my home’s air quality. These filters capture smaller particles like dust, pollen, mold spores, and pet dander much more effectively than lower-rated filters. Since I have allergies, this level of filtration really helps reduce the triggers that cause sneezing and congestion.

Another reason I rely on MERV 11 filters is their ability to protect my HVAC system. By trapping more debris, they prevent dust buildup on the internal components, which keeps the system running efficiently and can extend its lifespan. This means fewer breakdowns and lower energy bills, which is definitely a win for me.

Overall, choosing MERV 11 20x25x5 filters has been an easy way to improve both my indoor air quality and the health of my heating and cooling system. It’s a simple upgrade that makes a big difference in comfort and air cleanliness.

My Buying Guides on ‘Merv 11 20X25X5 Air Filters’

When I decided to upgrade my home’s air filtration system, I quickly realized how important it is to choose the right filter. MERV 11 20x25x5 air filters caught my attention because of their balance between filtration efficiency and airflow. Here’s what I learned through my buying journey, which I hope will help you make an informed decision.

Understanding MERV Ratings and Why MERV 11

I first needed to understand what MERV meant. MERV stands for Minimum Efficiency Reporting Value, which rates how effectively an air filter traps airborne particles. The scale runs from 1 to 20, with higher numbers capturing smaller particles.

MERV 11 filters, like the ones sized 20x25x5, are great for residential use because they capture dust, pollen, pet dander, mold spores, and even some bacteria. I chose MERV 11 because it offered improved indoor air quality without overly restricting airflow, which can strain my HVAC system.

Why Size 20x25x5 Matters

The size of the filter is crucial for a proper fit and optimal performance. My HVAC system specifies a 20x25x5 filter, meaning 20 inches by 25 inches with a 5-inch depth. The thicker 5-inch filters, compared to standard 1-inch filters, typically have more surface area for trapping particles and last longer before needing replacement.

I made sure to measure my existing filter slot carefully to confirm these dimensions before purchasing.

Material and Construction Quality

I found that not all MERV 11 20x25x5 filters are created equal. Some have better frame durability and filter media. I preferred filters with a sturdy metal or reinforced cardboard frame to prevent sagging and ensure a secure fit.

The filter media itself should be dense enough to trap particles but still allow good airflow. Pleated designs usually offer more surface area, which helps with both filtration efficiency and longevity.

Filter Longevity and Replacement Frequency

One thing I considered was how often I’d need to replace the filter. MERV 11 20x25x5 filters generally last between 3 to 6 months, depending on usage and air quality. Since mine is a 5-inch thick filter, I noticed it tends to last closer to 6 months, which is convenient and cost-effective.

I also recommend checking the filter every month initially to see how quickly it gets dirty, especially if you have pets or live in a dusty area.

Airflow and HVAC Compatibility

It’s important that the filter doesn’t restrict airflow excessively, as that can reduce HVAC efficiency and increase energy costs. I verified that my HVAC system supports MERV 11 filters and that the 5-inch thickness wouldn’t cause installation issues.

If your system isn’t designed for thicker filters, you might need an adapter or to consult a professional.

Brand Reputation and Price

I compared several brands and read user reviews to find a reliable filter that fits my budget. While I didn’t want to compromise on quality, I also found that some lesser-known brands offer great value.

Buying in multi-packs often reduces the cost per filter, which is helpful if you want to stock up and save in the long run.

Environmental Considerations

Finally, I looked into whether the filters were made with eco-friendly materials or if they were recyclable. While most disposable filters aren’t recyclable, some brands offer options with biodegradable components or reusable frames.

If sustainability is important to you, it’s worth investigating these alternatives.

Final Thoughts

Choosing the right MERV 11 20x25x5 air filter made a noticeable difference in my home’s air quality. By understanding MERV ratings, sizing, construction, and compatibility, I was able to select a filter that keeps my indoor air cleaner without putting stress on my HVAC system.

I hope my experience helps you find the perfect filter for your needs!

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Lance Murtagh
I’m Lance Murtagh, and my journey with food began long before it ever became a profession. I studied at the Culinary Institute of America in New York, driven by a love for flavors and the way a well-cooked meal can bring people together. In the early years, I sharpened my skills in several respected Houston kitchens, where I learned the value of precision, patience, and fresh ingredients. Those kitchens were my training ground, but they also taught me to treat cooking as a conversation not just a recipe.

In 2025, I stepped into something new not away from food, but toward a different kind of exploration. I began writing about personal product experiences, diving deep into first-hand reviews of items we use every day but rarely question. It was a natural transition. Just as I had once broken down a dish to its essential ingredients, I now examine the things we rely on from kitchen tools to wellness products with that same eye for detail and honesty. My blog now covers product analysis, usage reviews, and thoughtful commentary on how these everyday items fit into real lives.