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11.25x11.25x1 MERV 11 Pleated Air Filter

 

Actual Size: 11.25x11.25x0.75

$89.94$14.99/ea
delivery truckFree Delivery
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Superior
Superior

RESIDENTIAL AND/OR COMMERCIAL USE

Change Every 3 Months

Quantity

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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All types of air filters from Filterbuy

Premium Materials That Go The Distance

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85,000+ 5-Star Reviews From Happy Customers

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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., 11.25x11.25x1).
  • 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., 11.25x11.25x0.75 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 11.25"Act 11.25"
Nom 1"Act 0.75
Nom 11.25"Act 11.25"
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: 11.25x11.25x0.75 in → 11.25x11.25x1 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.
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.

Start Now

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 - return-vent

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

How to install your filter - Step 3 - return-vent

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

How to install your filter - Step 4 - return-vent

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

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Never forget to replace your air filter again.

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  • Edit, Skip, or Cancel Anytime.
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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 Size11.25 x 11.25 x 1 inches
Actual Size11.25 x 11.25 x 0.75 inches
Filter TypePleated
MediaElectrostatically Charged
FrameBeverage Board
MERV Ratings Available8, 11, 13
LifespanUp to 90 Days
OriginMade in USA

Buy the Best 11.25x11.25x1 MERV 11 HVAC & Furnace Air Filters for Home from Filterbuy

Precision-Engineered Comfort—Why Homeowners Trust Our 11.25x11.25x1 MERV 11 Filters

At Filterbuy, we’ve seen firsthand how hard it is for homeowners to find uncommon filter sizes—like 11.25x11.25x1—without compromising on performance or quality. That’s exactly why we custom-manufacture these MERV 11 HVAC and furnace filters in our family-run U.S. facility, where every filter is rigorously crafted and tested for exact fit and filtration efficiency. Based on years of working with homeowners dealing with allergies, pet dander, and system inefficiencies, we developed this filter to exceed industry standards—offering protection against up to 95% of airborne particles without choking your airflow. This page gives you everything you need to confidently choose the right filter, backed by our experience, data, and commitment to clean, healthy air.

TL;DR Quick Answers

Buy the Best 11.25x11.25x1 MERV 11 HVAC & Furnace Air Filters for Home from Filterbuy

For a balance of cleaner air and strong HVAC performance, Filterbuy’s 11.25x11.25x1 MERV 11 filters are a reliable choice. They capture common airborne particles like dust, pollen, pet dander, and mold spores without restricting airflow—making them ideal for homes that want improved air quality without overworking the system. With consistent sizing, durable construction, and easy replacement schedules, Filterbuy offers a dependable, cost-effective solution for maintaining healthier indoor air year-round.

Top Takeaways

  • Perfect fit matters. 11.25x11.25x1 MERV 8 filters ensure proper airflow and performance.

  • Cleaner indoor air. Captures up to 90% of dust, dander, and mold spores.

  • Save on energy. Clean filters can reduce HVAC energy use by up to 15%.

  • Made by experts. Built, tested, and trusted by Filterbuy’s in-house team.

  • Easy to order. Fast shipping, auto-delivery, and helpful support included.

When it comes to maintaining clean, healthy indoor air, the right air filter size and efficiency level make all the difference. Filterbuy’s 11.25x11.25x1 MERV 11 HVAC and furnace air filters are specifically designed for homes that require a less common, precision-cut size without sacrificing filtration performance.

With a MERV 11 rating, these filters capture up to 95% of airborne particles—including dust, pollen, pet dander, mold spores, and smoke—making them ideal for families with allergies, pets, or sensitivity to poor air quality. Unlike lower-grade filters that let fine particles slip through or clog quickly, our pleated design ensures longer-lasting airflow and efficiency.

What sets Filterbuy apart? Every filter is made-to-order in our Alabama-based facility using high-quality, American-made components. We don’t outsource, cut corners, or rely on one-size-fits-all solutions—because we know your home’s comfort and air quality depend on fit, reliability, and performance. Fast shipping, bulk pack options, and auto-replacement scheduling make it easy to stay on top of filter changes year-round.

Choose Filterbuy and breathe easier—because clean air starts with the right filter, made by people who care.

11.25x11.25x1 MERV 11 Furnace & HVAC Air Conditioner Filter

“We created our 11.25x11.25x1 MERV 11 filters because we kept hearing from homeowners who were frustrated by limited sizing options and flimsy off-the-shelf products. After years of working directly with HVAC professionals and families managing allergies and pet dander, we engineered a filter that fits precisely, performs consistently, and holds up longer—because clean air shouldn’t be a compromise.”

Supporting Statistics: Why Quality Air Filters Matter

Indoor air is often 2–5x more polluted than outdoor air.

  • Source: EPA

  • Poor indoor air can contain allergens, dust, mold spores, and more.

People spend ~90% of their time indoors.

  • Source: NIEHS

  • Clean air filters help protect against long-term indoor exposure.

25 million Americans have asthma—including 1 in 12 children.

  • Source: CDC

  • MERV 11 filters are ideal for homes with asthma or allergy concerns.

Final Thought & Opinion (At-a-Glance)

Why it matters: Choosing the right air filter isn’t just about fit—it’s about protecting your home’s air and your family’s health.

Here’s what sets Filterbuy’s 11.25x11.25x1 MERV 11 filters apart:

  • ✅ Custom fit for rare sizes—no more compromising with ill-fitting filters.

  • ✅ High-performance MERV 11 rating—captures up to 95% of airborne particles.

  • ✅ Made in the USA—crafted in-house, never outsourced or mass-produced.

What we've learned from experience:

  • Poor filtration impacts more than your HVAC—it affects sleep, breathing, and everyday well-being.

  • Homeowners with allergies, asthma, or pets see the biggest difference with MERV 11 filters.

  • Long-lasting filters help reduce HVAC strain and cut long-term energy costs.

Our opinion:

🔹 Air filters aren’t just maintenance—they’re protection.

🔹 Investing in a high-quality filter is investing in cleaner air, better comfort, and long-term peace of mind.

Next Steps: Get the Right Filter Today

  • Check your filter size

  • Pick your pack

  • Choose single or multi-pack options for better value.

  • Plan your replacements

  • MERV 11 filters last up to 90 days.

  • Set a reminder or use auto-delivery for convenience.

  • Fast shipping. U.S.-made quality. No middlemen.

  • Learn more if needed

Frequently Asked Questions

1. What makes Filterbuy’s 11.25x11.25x1 MERV 11 filter better than generic brands?

Our filters are custom-made in the U.S. using high-quality pleated media that captures up to 95% of airborne particles. Unlike off-the-shelf filters, our exact-fit design prevents air bypass and ensures consistent airflow and performance.

2. Is a MERV 11 filter safe to use in my HVAC system?

Yes. MERV 11 filters provide advanced filtration without restricting airflow in most residential systems. They are ideal for homes with pets, allergies, or higher air quality needs. Always check your HVAC manufacturer’s guidelines for compatibility.

3. How often should I replace my 11.25x11.25x1 MERV 11 filter?

We recommend replacing it every 2–3 months. If you have pets, allergies, or live in a high-dust area, monthly replacement may be more effective for maintaining optimal air quality.

4. Can I set up automatic deliveries for this filter size?

Yes! Filterbuy.com offers a convenient auto-delivery option so you never forget to change your filter. You can customize the delivery schedule to match your replacement needs.

5. What if I’m not sure this is the right filter size for my system?

Check the size printed on your existing filter or measure the actual filter slot. You can also reach out to Filterbuy’s customer service for sizing help before you order—our team is happy to assist!

Upgrade Your Air Quality with the Right Filter

Take the next step toward cleaner, healthier indoor air by choosing Filterbuy’s 11.25x11.25x1 MERV 11 HVAC and furnace filters—designed for reliable performance and consistent airflow. Shop now to experience a simple upgrade that helps protect your home, your system, and the air you breathe every day.