12x24x2 MERV 8 Pleated Air Filter
Actual Size: 11.38x23.38x1.75"
Free Delivery 
Factory-Direct Low Prices, Made in the USA
Hassle-Free Returns & Free Exchanges
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
12x24x2 MERV 8 Pleated Air Filter
Actual Size: 11.38x23.38x1.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
12x24x2 MERV 8 Pleated Air Filter
Actual Size: 11.38x23.38x1.75"
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 8 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
- Actual air filter size: 11.38x23.38x1.75"
- MERV 8 synthetic media (comparable with MPR 600 & FPR 5) offers standard protection from dust, pollen, and more by trapping 90% 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
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., 11.5x23.5x2).
- 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., 11.38x23.38x1.75" 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: 11.38x23.38x1.75" 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.
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 23.5 x 2 inches |
| Actual Size | 11.38 x 23.38 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 8 Furnace & HVAC Air Conditioner Filters
By Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy · Technically reviewed by David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions, Published September 23, 2026 · Updated September 23, 2026
TL;DR
The Filterbuy 12x24x2 MERV 8 air filter is a 2-inch pleated replacement filter for furnaces, air conditioners, and heat pumps, made in the USA. It measures 11.38" x 23.38" x 1.75" and lasts up to 90 days. MERV 8 sits in the middle of the industry's 1–16 filter rating scale, and it's the standard choice for most homes. Larger packs cost less per filter, and Auto Delivery saves 5%.
Key Takeaways
Actual size: A Filterbuy 12x24x2 air filter measures 11.38 x 23.38 x 1.75 inches. It's cut slightly under its label so it slides in.
Filtration: Filterbuy's MERV 8 Standard tier: "Captures 90% of Airborne Particles."
When to change it: Every 90 days in a typical home, or every 60 days with pets or allergies.
Yearly cost: On a 90-day schedule, a 12-pack costs $33.32 a year per filter slot. Buying one filter at a time costs $103.04.
Made in the USA: Cut to order in our own US plants, with fast and free 2-day delivery to most US states.
What Is the Filterbuy 12x24x2 MERV 8 Air Filter?
The Filterbuy 12x24x2 MERV 8 air filter is a 2-inch-deep pleated HVAC filter for any furnace, air handler, or return grille with a 12x24x2 slot. It's the Standard tier in Filterbuy's MERV 8 air filter lineup and part of our 2-inch air filters range. What's built into it:
Deep pleats: A 2-inch filter's pleats run much deeper than a 1-inch filter's, so it holds more dust before it loads up.
Electrostatic media: The fibers carry a static charge. They pull in fine particles the way a staticky sweater picks up lint.
Wire backing and beverage board frame: Beverage board is a moisture-resistant paperboard that keeps its shape in hot attics and damp basements. The wire keeps the pleats evenly spaced.
What Is the Actual Size of a 12x24x2 Air Filter?
The actual size of a Filterbuy 12x24x2 air filter is 11.38" x 23.38" x 1.75", or about 11⅜ x 23⅜ x 1¾ inches. "12x24x2" is the nominal size, the name you order by. We cut the filter a little smaller on purpose, and that clearance is what lets it slide in without bending.
Finding your size takes a minute. Our step-by-step guide to measuring an air filter walks through it:
Check your old filter's frame. Most show both the nominal and actual size.
Label worn off? Measure the old filter's length, width, and depth, then round each up to the next whole inch. 11⅜ x 23⅜ x 1¾ becomes 12x24x2.
No old filter? Measure the empty slot and round to the nearest whole inch.
Depth is the measurement our manufacturing team sees ordered wrong most often, so check all three before you order.
Homeowners bring me the old filter and ask what to buy. I ask for a photo of the empty slot instead. Half the time the filter they had been using was never right for the opening it sat in.
David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions
A snug fit matters. The EPA's Guide to Air Cleaners in the Home says a filter should fit without gaps or bending, and a Lawrence Berkeley National Laboratory study modeled 10–25% of air slipping around loose filters.
Size not listed? Filterbuy cuts custom air filters to the eighth of an inch. If a filter doesn't fit, our free exchange policy covers it.
What Does a MERV 8 Air Filter Catch?
A Filterbuy MERV 8 filter catches everyday household particles like dust, lint, pollen, and dust mite debris. Its rating on the Filterbuy ladder: "Captures 90% of Airborne Particles."
MERV stands for Minimum Efficiency Reporting Value. It's a 1–16 scale set by ASHRAE, the engineering society that wrote the test, and higher numbers catch smaller particles. The EPA explains how MERV ratings work. Comparing store brands? Filterbuy MERV 8 is comparable to MPR 600 and FPR 5.
Is MERV 8 the Best 12x24x2 Filter for Your Home?
MERV 8 is the standard choice for most homes. Use this quick check to pick your tier. All three come in the 12x24x2 size.
Filterbuy MERV 8 (Standard): Best for Healthy Families. Pick it if no one has allergies or asthma and you don't have pets.
MERV 11 (Superior): Best for Allergy Sufferers. Pick it for allergies, asthma, pets, or pollen.
MERV 13 (Optimal): Hospital Grade. Pick it for smoke.
Whichever tier you choose, check your HVAC manual for the MERV ratings your system supports. It's the same fit check as confirming your size.
What actually hurts systems is the filter nobody remembered to change. I would rather you run MERV 11 on a real schedule than MERV 13 for eight months.
Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy
Table 1: Filterbuy 12x24x2 MERV 8 vs. MERV 11 vs. MERV 13
*Regular 12-pack prices as of September 21, 2026, before sales and the 5% Auto Delivery discount. Check your HVAC manual for the MERV ratings your system supports, the same way you'd confirm your size.
Shop the other tiers: 12x24x2 MERV 11 air filters · 12x24x2 MERV 13 air filters. For more detail, see our guide to MERV ratings, charts, and scales.
Which Pack Size Should You Buy: 4-Pack, 6-Pack, or 12-Pack?
On 90-day changes, a 4-pack lasts a year and a 12-pack lasts three. On 60-day changes, a 6-pack lasts a year. Those are Filterbuy's two most popular Auto Delivery schedules: every 90 days for standard homes and every 60 days for homes with pets.
Table 2: Filterbuy 12x24x2 MERV 8 Pack Coverage (One Filter Slot)
*Prices as of September 21, 2026. Coverage assumes one filter slot. Auto Delivery takes another 5% off every order.
What a year of filters costs (one slot):
Buying one at a time: $103.04 a year on 90-day changes.
4-pack: $45.80 a year. A good one-year trial.
6-pack: $56.58 a year on 60-day changes.
12-pack: $33.32 a year, or $31.65 with Auto Delivery. Best for landlords or homes with more than one 12x24x2 slot.
How Does a 12x24x2 MERV 8 Filter Subscription Work?
Filterbuy Auto Delivery ships your 12x24x2 MERV 8 filters every 1, 2, or 3 months with 5% off every order. You can edit, skip, or cancel anytime. We email a reminder three days before each shipment, so the new filter shows up when it's due.
A dirty filter costs you. ENERGY STAR notes it can raise energy costs and damage equipment. The US Department of Energy estimates that routinely replacing filters can cut an air conditioner's energy use by 5–15%. Set up air filter auto-delivery.
Are Filterbuy 12x24x2 MERV 8 Filters Made in the USA?
Yes. Filterbuy 12x24x2 MERV 8 filters are cut, pleated, and framed to order in our own US plants. Filterbuy is a manufacturer, not a reseller, so you buy factory-direct with no middleman markup.
We're a second-generation, family-owned company, and we sold our first air filter in 2013. More than two million families rely on Filterbuy, with 85,000+ reviews and a 4.9/5 Google rating.
How Do You Replace a 12x24x2 Air Filter?
Replacing a Filterbuy 12x24x2 air filter takes about two minutes. Watch the airflow arrow.
Turn off the system at the thermostat.
Pull out the old filter and note which way its arrow points.
Slide in the new filter with the arrow pointing toward the furnace or air handler.
Turn the system back on.
Fit check: The filter should sit flat without bowing or rocking. If you had to force it in, take it out and recheck your size.
Pro tip: Write the install date on the frame. At 30 days, hold the filter against a sheet of white paper. Gray and matted? Replace it. Still light? Check again at 60. After two checks, you'll know your home's real interval.
Supporting Statistics: What the Research Says
More than 90% of US homes have three or more allergens.
NIH studied bedrooms in nearly 7,000 US homes.
73% had at least one allergen at high levels.
Why it matters: A MERV 8 filter captures everyday particles like dust mite debris and pollen.
Two in three US homes cool with central AC or a heat pump.
EIA surveyed 18,496 households in 2020.
88% use air conditioning.
Why it matters: One filter serves both furnace and AC, so change it year-round.
AC coils can foul in about 7.5 years.
That's well short of a 15–30 year coil life.
Filter efficiency was the biggest factor.
In this simulation, MERV 12 filters delayed fouling about 7x versus MERV 2.
Why it matters: A pleated, MERV-rated filter helps keep your AC coil clean.
Source: Lawrence Berkeley National Laboratory, ACEEE Summer Study, 2002
Frequently Asked Questions
How Often Should I Change a 12x24x2 MERV 8 Filter?
Every 90 days in a typical home, every 60 with pets or allergies, and every 30 during wildfire smoke or renovation dust. Our guide to how often to change your air filter covers more cases.
Can I Use a 12x24x2 Filter in a 12x24x1 Slot?
No. A 2-inch filter won't fit a 1-inch rack, so buy the depth your system takes. Filterbuy also makes 12x24x1 MERV 8 air filters.
My Old Filter Says 11.5x23.5x2. Is That the Same Size?
Yes. Some labels, including our product listing, show 11.5x23.5x2. The actual size is the same 11.38 x 23.38 x 1.75 inches.
Which MERV Rating Works with My System?
Check your HVAC manual for the ratings it supports, the same way you'd confirm your size. If the manual doesn't say, ask your HVAC technician.
Is MERV 8 Good for Pets?
MERV 8 captures pet hair, but Filterbuy recommends 12x24x2 MERV 11 air filters for homes with pets.
Glossary
MERV (Minimum Efficiency Reporting Value): ASHRAE's 1–16 scale for how well an air filter captures airborne particles. Higher numbers capture smaller particles.
ASHRAE: The American Society of Heating, Refrigerating and Air-Conditioning Engineers, which wrote the MERV test.
Nominal size: The rounded size printed on a filter label, used for ordering.
Actual size: A filter's true measured dimensions, slightly smaller than nominal.
MPR and FPR: Third-party retail rating systems used by other brands. They're separate from MERV.
About the author: Michelle Wan is Brand Manager and Air Quality Writer at Filterbuy. She works directly with Filterbuy's US manufacturing team and writes from how filters are built and used, not from spec sheets. She holds a B.A. from UC Santa Cruz.
About the reviewer: David Clark is a Licensed HVAC Technician with Filterbuy HVAC Solutions who reviews Filterbuy's technical guidance for accuracy.