12x24x2 MERV 13 Pleated Air Filter
Actual Size: 11.375x23.375x1.75"
Free Delivery 
Factory-Direct Low Prices, Made in the USA
Hassle-Free Returns & Free Exchanges
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 11.375x23.375x1.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 11.375x23.375x1.75"
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 11.5x23.5x2 MERV 13 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
- Actual air filter size: 11.375x23.375x1.75"
- MERV 13 synthetic media (comparable with MPR 1500/1900 and FPR 10) offers the best protection from dust, pollen, pet dander, mold, smog, bacteria, and virus carrying particles by trapping 98% 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 11.5x23.5x2 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
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Premium Materials That Go The Distance
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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., 11.5x23.5x2).
- 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., 11.375x23.375x1.75" 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: 11.375x23.375x1.75" in → 11.5x23.5x2 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.
| What it captures | MERV 8EssentialDust & Allergen Defense | MERV 11AdvancedPet & Allergen Defense | MERV 13PremiumPet & Allergen Defense |
|---|---|---|---|
| Comparable ratings | MPR 700 & FPR 5 | MPR 1200 & FPR 7 | MPR 1500-1900 & FPR 10 |
| Dust & Debris | Yes | Yes | Yes |
| Dust Mites | Yes | Yes | Yes |
| Pollen | Yes | Yes | Yes |
| Mold | Yes | Yes | Yes |
| Lint | Yes | Yes | Yes |
| Dander | Yes | Yes | Yes |
| Smoke & Smog | No | Yes | Yes |
| Bacteria | No | No | Yes |
| Odors | No | No | No |
| Shop MERV 8 | Shop MERV 11 | Shop MERV 13 |
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 23.5 x 2 inches |
| Actual Size | 11.375 x 23.375 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 12x24x2 MERV 13 Furnace & HVAC Air Conditioner Filters
By Michelle Wan, Brand Manager and Air Quality Writer | Reviewed by David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions | Published October 30, 2026 | Updated October 30, 2026
A 12x24x2 MERV 13 air filter is a 2-inch pleated furnace and AC filter carrying the top Filterbuy residential rating. We cut it to 11.375 x 23.375 x 1.75 inches so it slides into a 12x24x2 slot and build it in our own US plants for 90 days of use.
TL;DR
A 12x24x2 MERV 13 filter is the finest-capture pleated filter Filterbuy makes for a 12x24x2 furnace or heat pump slot. It targets smoke and smog particles and lasts up to 90 days. Check your HVAC (heating and cooling) manual for compatibility, the same way you'd confirm your size, then pick a 6 or 12 pack.
Key Takeaways
A Filterbuy 12x24x2 MERV 13 actually measures 11.375 x 23.375 x 1.75 inches.
MERV 13 is the top Filterbuy residential rating and the only one built to target smoke and smog particles.
The U.S. Environmental Protection Agency (EPA) advises at least MERV 13, or the highest rating your system allows.
A 12 pack costs about $59 a year per slot on 90-day changes, versus $146 buying one filter at a time.
On a 90-day schedule, a 6 pack covers one slot for 18 months and a 12 pack for three years.
What Is A 12x24x2 MERV 13 Air Filter?
A 12x24x2 MERV 13 air filter is a disposable pleated HVAC filter with a nominal size of 12 by 24 by 2 inches. MERV 13 is its rating on the ASHRAE Standard 52.2 scale, the industry test for how much a filter captures. It sits where air returns to your furnace, AC, or heat pump and catches particles before they reach the blower, the fan that moves air through your home.
Listings call it a 12x24x2 MERV 13 furnace, HVAC, or AC furnace air filter. Compare 12x24x2 air filters in every rating if you're unsure.
Filterbuy sells MERV 13 as its Optimal rating. Each one pairs electrostatic synthetic media, which holds a static charge that grabs fine particles, with aluminum wire backing. A moisture-resistant beverage board frame keeps it square in heat and humidity.
What Is The Actual Size Of A 12x24x2 MERV 13 Air Filter?
The actual size of a Filterbuy 12x24x2 MERV 13 air filter is 11.375 x 23.375 x 1.75 inches. Finding yours takes a minute, because 12x24x2 is printed on your old filter's frame. That label is the nominal size, the ordering name. Our filters are cut slightly under it on purpose, and that clearance is what lets them slide in without binding.
Label worn off? Measure the old filter's length, width, and depth and round each number up to the nearest whole inch, or follow our step-by-step guide to measuring an air filter. If the filter is missing, measure the slot opening the same way.
Depth is the dimension the Filterbuy manufacturing team sees ordered wrong most often, so check all three numbers.
The question I get most is which MERV to buy. The one to ask first is whether the filter you are holding actually fills the slot. A rating describes the media, not the gap around it.
Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy
Lawrence Berkeley National Laboratory researchers, in an LBNL analysis of filter bypass in home systems, estimated 10% of air slips past a filter in a loose slot and 25% past one with a large gap.
Between standard sizes? Filterbuy cuts a custom air filter to within an eighth of an inch.
How Does MERV 13 Compare To MERV 8 And MERV 11 In The 12x24x2 Size?
MERV 13 targets the smallest particles of the three 12x24x2 pleated ratings Filterbuy makes. MERV 8 targets dust, lint, pollen, and mold spores, MERV 11 adds finer dust and pet dander, and MERV 13 adds smoke and smog particles. Pick by what you want captured, and check your HVAC manual for compatibility, the same way you'd confirm your size.
A MERV rating is a floor. It reflects the lowest efficiency a filter holds as it loads with dust. The EPA advises choosing at least MERV 13, or the highest rating your system fan and filter slot allow, per the EPA explanation of MERV ratings.
Every tier has a job. Choose the 12x24x2 MERV 11 air filter for allergies, asthma, pets, or pollen, or the 12x24x2 MERV 8 air filter, the standard choice for most homes. Our guide on which MERV rating to use compares them side by side.
Is A 12x24x2 MERV 13 Filter Good For Allergies?
A Filterbuy 12x24x2 MERV 13 filter captures common airborne allergen particles, including pollen, pet dander, mold spores, and dust. MERV 11 is the Filterbuy tier we match to allergies and asthma. MERV 13 adds smoke and smog particles, so it's the pick when smoke is part of the picture. The ACAAI guidance on home air filters names a disposable HVAC filter rated MERV 11 to 13 as the most cost-efficient choice for whole-house filtration.
Questions about symptoms belong with your doctor. For more on filtration and allergens, see our guide to the best air filters for allergies.
Should You Buy A 6 Pack Or A 12 Pack?
Buy a 12x24x2 MERV 13 air filter 6 pack if you change one filter every 90 days and want 18 months of supply. Buy a 12x24x2 MERV 13 air filter 12 pack if your home has two 12x24x2 slots or you change filters every 60 days.
We built this matrix around the two schedules Filterbuy customers pick most: every 90 days for standard homes and every 60 days for homes with pets. To skip the stack, Filterbuy auto delivery ships on your schedule, saves 5% on every order, and cancels anytime.
What Does A Year Of 12x24x2 MERV 13 Filters Cost?
On September 29, 2026 Filterbuy prices, six filters cost 59% less each than one. A 12 pack saves only 29 cents a filter over a 6 pack, so let storage space and slot count decide between them.
How Often Should You Replace A 12x24x2 MERV 13 Filter?
Plan on a 12x24x2 MERV 13 air filter replacement every 90 days in a typical home. Move to every 60 days with pets or allergy concerns, and check it monthly in peak heating and cooling seasons and on smoky days.
Two filter changes will tell you your home's real schedule. Here's the method Filterbuy recommends:
Write the install date on the frame.
At 30 days, hold the filter next to a white sheet of paper, the check in the American Lung Association guide to air cleaning.
Change it if the pleats look gray and matted. Otherwise, check again at 60 days.
Repeat once, then set your schedule. Our guide on how often to change your air filter covers more situations.
How To Install A 12x24x2 MERV 13 Filter
Installing a Filterbuy 12x24x2 MERV 13 filter takes no tools. Turn the system off, remove the old filter, slide the new one in with the airflow arrow pointing toward the furnace or air handler, and turn the system back on.
Turn off the HVAC system at the thermostat or the service switch.
Slide out the old filter and note its arrow direction.
Insert the new filter with the arrow pointing toward the blower. At a return grille, it points into the wall or ceiling.
Close the door or grille and restart the system. Date the frame.
Then run the fit check we recommend after you install. With the system running, move your hand around the filter edges. Moving air means a gap. A filter that bows is too big, and one that rocks is too small.
What Makes The Best 12x24x2 MERV 13 Air Filter?
The best 12x24x2 MERV 13 air filter fits the slot exactly, carries a true ASHRAE 52.2 MERV rating, and holds its shape for the full change interval. Those three traits matter more than any label claim, and you can check them on any brand's 12x24x2 MERV 13 pleated air filter before you buy.
Exact fit. It seats in the slot with no edge gaps.
A true MERV rating. MERV comes from the ASHRAE 52.2 test, as the DOE Building America guide to high-MERV filters explains, so skip retailer-only scales.
Rigid construction. Wire-backed pleats and a moisture-resistant frame keep the media from sagging.
Filterbuy is a family-owned manufacturer, not a reseller. Filters are cut, pleated, and framed to order in our own US plants and ship within 24 hours. You get fast and free 2-day delivery to most US states and a free 90-day size exchange under our shipping, returns, and exchange policy.
We also make MERV 13 air filters in hundreds of sizes, and our 2-inch air filters share this construction.
Supporting Statistics
88% of US households use air conditioning.
Two-thirds of all households use central AC or a central heat pump.
Why it matters: one 12x24x2 slot filters air for both furnace and AC.
Source: U.S. Energy Information Administration, 2020 RECS (18,496 households).
Over 90% of US homes had three or more detectable allergens.
73% had at least one allergen at elevated levels.
Why it matters: MERV 13 media is built to capture pet dander and dust mite particles.
Source: NIH study of allergens in US homes (nearly 7,000 homes).
Nearly half of home energy goes to heating and cooling.
ENERGY STAR advises monthly checks and a change at least every three months.
Why it matters: that matches the 90-day life Filterbuy builds into this filter.
Frequently Asked Questions
Is A 12x24x2 Filter The Same As A 12x24x1 Filter?
No. A 12x24x2 is about 1.75 inches deep and a 12x24x1 about 0.75 inches. For a 1-inch slot, shop the 12x24x1 MERV 13 air filter.
Is A MERV 13 Filter The Same As A HEPA Filter?
No. MERV 13 is an ASHRAE 52.2 rating for HVAC filters. HEPA is a separate standard used mostly in portable air purifiers.
Which MERV Rating Works With My System?
Your HVAC manual lists the ratings it supports. Check it the same way you'd confirm your size, and if it doesn't say, ask your HVAC technician.
How Many 12x24x2 Filters Does My Home Need?
Count your filter slots. Many homes have one, but homes with two systems or several return grilles can have more, and each slot needs its own filter on the same schedule.
Glossary
MERV: Minimum Efficiency Reporting Value, a 1 to 16 rating for how well an HVAC filter captures particles 0.3 to 10 microns in size.
ASHRAE Standard 52.2: The ASHRAE test method that produces MERV ratings.
Nominal Size: The rounded size printed on a filter frame or rack, such as 12x24x2.
Actual Size: A filter's true measured dimensions, cut slightly under the nominal size.
Electrostatic Media: Synthetic filter media with a static charge that helps hold particles.
HEPA Filter: High efficiency particulate air filter, rated under a separate standard from MERV.
HVAC: Heating, ventilation, and air conditioning.
EPA, EIA, NIH, ENERGY STAR: Federal sources cited here: the U.S. Environmental Protection Agency, Energy Information Administration, National Institutes of Health, and ENERGY STAR program.
ACAAI: The American College of Allergy, Asthma and Immunology.
Filterbuy: A family-owned American manufacturer of pleated HVAC air filters.