12x20x2 MERV 11 Pleated Air Filter
Actual Size: 11.5x19.5x1.75"
Free Delivery 
Factory-Direct Low Prices, Made in the USA
Hassle-Free Returns & Free Exchanges
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
12x20x2 MERV 11 Pleated Air Filter
Actual Size: 11.5x19.5x1.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
12x20x2 MERV 11 Pleated Air Filter
Actual Size: 11.5x19.5x1.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
About
- This is a list 11.5x19.5x1.75 MERV 11 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
- Actual air filter size: 11.5x19.5x1.75"
- 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 11.5x19.5x1.75 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., 11.5x19.5x1.75).
- 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., 11.5x19.5x1.75" 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.
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: 11.5x19.5x1.75" in → 11.5x19.5x1.75 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.
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 & DebrisDust Mites & ParticlesPollenMoldLintDander
Smoke & Smog
Merv 13
Comparable to:FPR: 10
MPR: 1900-2800
Dust & DebrisDust Mites & ParticlesPollenMoldLintDanderSmoke & 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 | 11.5 x 19.5 x 1.75 inches |
| Actual Size | 11.5 x 19.5 x 1.75" inches |
| Filter Type | Pleated |
| Media | Electrostatically Charged |
| Frame | Beverage Board |
| MERV Ratings Available | 8, 11, 13 |
| Lifespan | Up to 90 Days |
| Origin | Made in USA |
Best 12x20x2 MERV 11 Furnace & HVAC Air Conditioner Filters
By Michelle Wan, Brand Manager & Air Quality Writer · Reviewed by David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions · Published September 23, 2026 · Updated September 23, 2026
TL;DR
A 12x20x2 MERV 11 air filter is a pleated 2-inch furnace and AC filter that actually measures 11.5 x 19.5 x 1.75 inches. MERV 11 is a mid-range rating on the 1–16 scale that shows how much a filter captures, and it's Filterbuy's Superior tier for Allergy Sufferers. We cut, pleat, and frame it to order in our own US plants. For most households, the 6-pack is the value sweet spot.
Key Takeaways
The Filterbuy 12x20x2 MERV 11 filter's actual size is 11.5" x 19.5" x 1.75". "12x20x2" is the nominal size you order by.
MERV 11 is Filterbuy's Superior tier for Allergy Sufferers: Captures 95% of Airborne Particles.
By our math, a 6-pack works out to roughly 14 cents a day on a 90-day schedule, versus 31 cents buying singles.
Stepping up from MERV 8 to MERV 11 in this size adds roughly 3 cents a day.
Check your HVAC manual for compatibility before you pick a rating. It's the same quick check as confirming your size.
What Is a 12x20x2 MERV 11 Air Filter?
The Filterbuy 12x20x2 MERV 11 air filter is a disposable pleated filter for furnaces, central air conditioners, heat pumps, and air handlers with a 12" x 20" x 2" slot. It traps pollen, pet dander, mold spores, and dust as air moves through your system. Your furnace and AC share this one filter, so there's nothing separate to buy.
What Is the Actual Size of a 12x20x2 Air Filter?
Finding your size takes a minute or so. Read the size printed on your old filter's frame, or measure the old filter. No filter in the slot? Measure the slot instead. If it comes to roughly 12 by 20 inches and 2 inches deep, you need a 12x20x2.
The actual size of the Filterbuy 12x20x2 is 11.5 x 19.5 x 1.75 inches. "12x20x2" is the nominal size, the name you order by. We cut the filter a little smaller by design, and that clearance is what lets it slide in and fit. The EPA's guide to air cleaners in the home says a filter should fit snugly, with no gaps and no bending.
Size not listed? We cut custom air filters to the eighth of an inch. Ordered the wrong one? Size exchanges are free for 90 days.
Is MERV 11 the Best Filter Rating for Your Home?
MERV 11 is the right rating if someone in your home has allergies or asthma, or if you have pets or a lot of pollen. MERV 8 is the standard choice for most homes. MERV 13 is Filterbuy's pick for smoke. Whichever you choose, check your HVAC manual for compatibility, the same quick check as confirming your size.
Filtration percentages are general Filterbuy marketing figures. MPR and FPR are third-party rating scales, so comparisons are approximate.
Filterbuy's rule of thumb:
MERV 8: the standard choice for most homes (shop 12x20x2 MERV 8).
MERV 11: allergies and asthma; also pets and pollen.
MERV 13: smoke (shop 12x20x2 MERV 13).
Odor Eliminator: odors (shop Odor Eliminator; currently sold in 1-inch sizes).
What does each rating cost per year? We priced all three 12x20x2 ratings at 6-pack rates:
Filterbuy.com prices on September 21, 2026.
On a 90-day schedule, MERV 11 costs $11.52 a year more than MERV 8, roughly 3 cents a day. MERV 13 adds another $22.56. Compare the tiers on the full MERV rating chart.
Is a 12x20x2 MERV 11 Filter Good for Allergy Sufferers?
Yes. If you're shopping for a 12x20x2 MERV 11 air filter for allergies, this is the tier built for you. It captures airborne pollen, pet dander, and mold spores as air passes through your system. Dust mite allergen is a different story, since it's heavy and settles quickly.
Pet dander keeps reaching the filter. Cat and dog allergen particles are often under 2 microns (a micron is a millionth of a meter) and can stay in the air for days.
Dust mite allergen mostly settles before it reaches a vent. The Asthma and Allergy Foundation of America covers what to do about bedding and humidity.
For symptoms, talk with your doctor or an allergist.
Which Pack Size Should You Buy: 4-Pack, 6-Pack, or 12-Pack?
Buy the Filterbuy 12x20x2 MERV 11 air filter 4-pack for a year of 90-day changes. Buy the 6-pack for a year of 60-day changes, or 18 months at 90 days. Two 12x20x2 slots in your home? Double the count, or buy the 12-pack.
Cost/day based on 90-day changes. Prices as listed on Filterbuy.com on September 21, 2026, and may change.
Pro tip: The 6-pack gets nearly all of the bulk savings: 55% off the single-filter price, versus 57% for a 12-pack. Unless the home has two 12x20x2 slots, six is the number we'd buy.
How Does Filterbuy's 12x20x2 MERV 11 Air Filter Subscription Work?
Filterbuy's air filter subscription, called Auto Delivery, ships replacement 12x20x2 MERV 11 filters every 1, 2, or 3 months and takes 5% off every order. We email a reminder 3 days before each shipment, and you can adjust, skip, or cancel anytime. Set it once and breathe easy.
How Often Should You Replace a 12x20x2 MERV 11 Filter?
Filterbuy recommends replacing a 12x20x2 MERV 11 filter every 90 days in a typical home. Change it every 60 days with pets or allergies, and every 30 days with smoke or respiratory concerns. Write the install date on the frame so you don't have to guess.
Not sure it's time? Hold the filter up to a light. If light doesn't pass through the pleats, replace it, whatever the calendar says. There's more in our guide on how often to change your HVAC filter.
How Do You Install a 12x20x2 Replacement Filter?
Installing a Filterbuy 12x20x2 replacement filter takes a few minutes and no tools. Two things matter most. Point the frame's airflow arrow toward the furnace or air handler. Then make sure the filter sits snugly, because air that slips around the frame doesn't get cleaned.
Turn off your HVAC system at the thermostat.
Find the filter slot in your return air vent or beside the furnace or air handler.
Remove the old filter and note which way its airflow arrow points.
Slide in the new filter with the arrow pointing toward the blower, away from the return vent.
Turn the system back on and write the install date on the frame.
What Makes Filterbuy's Pleated 12x20x2 MERV 11 Filter Different?
Filterbuy is a manufacturer, not a reseller. We cut, pleat, and frame this 12x20x2 MERV 11 filter to order in our own US plants, then ship it factory-direct. The moisture-resistant frame and aluminum wire backing keep the pleats evenly spaced, so the filter holds its shape in the slot.
You get fast and free 2-day delivery to most US states.
I don’t want anyone to feel like they need an HVAC license just to pick the right filter. My job is to give you the straight answer, explain why it matters, and let you get back to your day.
Michelle Wan, Brand Manager & Air Quality Writer, Filterbuy
See all 12x20x2 air filters or MERV 11 air filters in other sizes.
Supporting Statistics: What the Research Shows
90%+ of U.S. homes have three or more detectable allergens.
73% have at least one at high levels (NIEHS, 2017).
Why it matters: pet dander and pollen are what the MERV 11 tier is built to capture.
HVAC systems usually run less than 25% of the time.
Filters clean air only while the system runs.
Why it matters: in pollen season, try setting the thermostat fan to "On."
A clean filter can cut AC energy use by 5–15%.
Why it matters: a 60- or 90-day schedule keeps the air cleaner and the power bill lower.
Frequently Asked Questions
Will a 12x20x2 MERV 11 Filter Fit My System?
Yes, if your slot takes a 12x20x2. Check your HVAC manual for compatibility before choosing a rating, the same quick check as confirming your size.
Does a MERV 11 Filter Remove Smoke and Odors?
MERV 11 captures some smoke particles, and MERV 13 is Filterbuy's pick for smoke. Odors are a separate job. Filterbuy's Odor Eliminator uses activated carbon for odors and is currently sold in 1-inch sizes.
Can I Wash and Reuse a 12x20x2 MERV 11 Filter?
No. It's disposable. Washing damages the electrostatic charge and the pleats.
How Does MERV Compare With MPR and FPR?
MERV is the industry-standard scale from ASHRAE, the heating and air conditioning engineers' society. MPR and FPR are third-party rating systems, not Filterbuy's, so any comparison is approximate. Filterbuy's MERV 11 is comparable to MPR 1000–1200 & FPR 7.
Glossary
MERV (Minimum Efficiency Reporting Value): A 1–16 rating defined by ASHRAE Standard 52.2 that measures how well a filter captures airborne particles.
Nominal size: The rounded filter dimensions used for ordering, such as 12x20x2.
Actual size: The measured dimensions of a filter, such as 11.5 x 19.5 x 1.75 inches for a 12x20x2.
Pleated filter: A filter with media folded into pleats for more surface area.
Electrostatic media: Charged filter material that holds small particles.
MPR and FPR: Third-party filter rating scales that aren't interchangeable with MERV.
Auto Delivery: Filterbuy's filter subscription that ships replacements on your schedule at 5% off.
Filterbuy: A US air filter manufacturer that sells factory-direct at Filterbuy.com.