12x30x2 MERV 11 Pleated Air Filter
Actual Size: 11.5x29.5x1.75
Free Delivery 
Factory-Direct Low Prices, Made in the USA
Hassle-Free Returns & Free Exchanges
RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 11.5x29.5x1.75
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 11.5x29.5x1.75
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 12x30x2 MERV 11 air filter replacement for your furnace, air conditioner, heat pump, or HVAC system
- Actual air filter size: 11.5x29.5x1.75
- 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 12x30x2 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.
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Things to Know About Filter Sizes
Nominal Size
- The rounded size printed on your filter or HVAC unit (e.g., 12x30x2).
- 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., 11.5x29.5x1.75 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: 11.5x29.5x1.75 in → 12x30x2 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 | 12 x 30 x 2 inches |
| Actual Size | 11.5 x 29.5 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 12x30x2 MERV 11 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 October 30, 2026 · Updated October 30, 2026
A 12x30x2 MERV 11 air filter is a 2-inch pleated replacement filter for furnaces, air handlers, and central air conditioners with a 12 by 30 inch filter slot. At Filterbuy, we cut ours to 11.5 x 29.5 x 1.75 inches from synthetic media with a static charge that attracts fine particles. On the MERV scale, which rates how well a filter captures airborne particles, MERV 11 sits between MERV 8 and MERV 13.
TL;DR
The best 12x30x2 MERV 11 filter matches your slot and captures finer particles than MERV 8. Replace it about every 90 days. Check your HVAC manual to confirm your system takes MERV 11, the same way you'd confirm your size.
Key Takeaways
12x30x2 is a nominal size, the rounded name you order by. The Filterbuy 12x30x2 MERV 11 filter actually measures 11.5 x 29.5 x 1.75 inches so it slides into the slot without forcing.
MERV 11 is the first rating in the EPA MERV table with a tested minimum for the smallest particles, 0.3 to 1 micron (millionths of a meter). MERV 8 has none there.
Lawrence Berkeley National Laboratory modeling puts filter bypass at 10% to 25% for loose or gapped filters, so fit comes before rating.
What Is A 12x30x2 MERV 11 Air Filter?
A 12x30x2 MERV 11 air filter is a pleated HVAC filter sized 12 by 30 inches and 2 inches deep. It's rated under ASHRAE Standard 52.2, the industry lab test for filters. The 2-inch depth gives the pleats more room to hold dust than a 1-inch filter with the same face size.
The National Air Filtration Association MERV user guide notes that a MERV reflects the lowest efficiency measured across six dust-loading test cycles, a worst-case result.
See every size in Filterbuy 2 inch air filters.
What Makes The Best 12x30x2 MERV 11 Air Filter?
The best 12x30x2 MERV 11 air filter fits the slot snugly and carries a genuine MERV 11 rating from ASHRAE 52.2 testing. Its pleats should also hold their shape for the full replacement interval. Michelle Wan, who wrote this page, puts fit ahead of rating.
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.
Filterbuy builds its MERV 11 air filters this way in hundreds of sizes.
As with your size, confirm the rating in your furnace or air handler manual. If the manual's missing, our guide on which MERV rating to use explains how to check compatibility.
12x30x2 MERV 11 Vs MERV 8: What Is The Difference?
MERV 11 captures a wider range of small particles than MERV 8. The EPA MERV rating guidance shows that MERV 8 has tested minimums only for particles from 1 to 10 microns, while MERV 11 adds one for the finest range.
MPR and FPR are third-party rating systems from other companies. Check your HVAC manual for compatibility, the same way you'd confirm your size.
MERV 8 is the standard choice for most homes: shop 12x30x2 MERV 8 air filters. MERV 11 suits homes with allergies and asthma, pets, or pollen. For smoke, choose 12x30x2 MERV 13 air filters.
Is A 12x30x2 MERV 11 Air Filter Good For Allergies?
A 12x30x2 MERV 11 filter is a strong fit for homes dealing with pollen and pet dander. The American College of Allergy, Asthma and Immunology (ACAAI) names disposable MERV 11 to 13 filters the most cost-efficient way to filter a whole house through a central system. It notes these filters catch pollen, pet allergens, and mold. For questions about allergy or asthma symptoms, talk to your doctor or an allergist.
Will A 12x30x2 MERV 11 Filter Fit My Furnace?
Finding your size is usually easy, since it's printed on the old filter's frame. A 12x30x2 MERV 11 filter fits furnaces, air handlers, and return grilles built for a nominal 12x30x2 filter. The U.S. Department of Energy notes that a filter on the blower's return side protects the HVAC motor while it cleans circulating air.
Check the frame label. 12x30x2 or 11.5 x 29.5 x 1.75 confirms this size.
No label? Measure the old filter's length, width, and depth and round each dimension up to the next whole inch. No old filter? Measure the slot. The Filterbuy air filter sizes chart shows how nominal and actual sizes line up.
Check depth carefully. It's the dimension the Filterbuy manufacturing team sees ordered wrong most often, and a 1-inch filter in a 2-inch slot leaves a gap that lets air bypass the media.
Watch for lookalike sizes. A 12 x 30.5 x 2 filter is a separate size with a longer actual length, so it won't substitute for a 12x30x2.
Slide the new filter in with the airflow arrow pointing toward the blower, the same direction as the old filter.
Our filter leaves about 1/4 inch of clearance per side in a 12 x 30 opening, the gap we design for. If your opening lands more than about 1/4 inch off 12 x 30, we can build a custom air filter to the size you measured. After installing, run a hand around the edges with the system on, and treat any moving air as a gap.
How Long Does A 12x30x2 MERV 11 Air Filter 6 Pack Last?
A 6 pack of 12x30x2 MERV 11 filters lasts about 18 months on the 90 day schedule Filterbuy rates this filter for. On a 60 day schedule, the same 6 pack covers a full year. ENERGY STAR recommends inspecting filters monthly and changing them at least every three months, sooner if a filter looks dirty.
Estimates assume one filter slot. With two slots, a 6 pack lasts 9 months on a 90 day schedule.
How Does A 12x30x2 MERV 11 Filter Subscription Work?
A 12x30x2 MERV 11 filter subscription through Filterbuy auto-delivery ships a fresh filter every 30, 60, or 90 days and saves you 5%. You can edit, skip, or cancel anytime. You'll get fast and free 2-day delivery to most US states.
Can You Buy A 12x30x2 MERV 11 Filter At Home Depot Or Near Me?
You might. Home improvement stores such as The Home Depot tend to carry the most common sizes, so a 2-inch filter with a 12x30 face may not be on the shelf. Check inventory online, and confirm a 2-inch depth and an 11.5 x 29.5 x 1.75 actual size.
Some retail listings use FPR, a separate scale created by The Home Depot, so compare products by MERV whenever it's listed. Filterbuy isn't affiliated with or endorsed by The Home Depot. We make this filter ourselves, and our listing shows the exact actual size we cut.
Supporting Statistics
1. Two-Thirds Of U.S. Homes Use Central Air Or A Heat Pump
88% of U.S. homes use air conditioning.
Two-thirds rely on central AC or a central heat pump.
Central systems pull return air through a filter.
Source: U.S. Energy Information Administration 2020 Residential Energy Consumption Survey.
2. A Loose Filter Can Let 10% To 25% Of Air Slip Past
Loose-fitting slot: about 10% of air bypasses the filter.
Large gap around the frame: about 25% bypasses it.
Bypass can largely erase the added efficiency of a higher-MERV filter.
Source: Lawrence Berkeley National Laboratory modeling estimates, published in the ACEEE Summer Study on Energy Efficiency in Buildings.
3. Pet Allergens Turn Up In Almost Every U.S. Home
More than half of U.S. households have a dog, a cat, or both.
Dog and cat allergens appear in almost all U.S. homes, even homes without pets.
Source: National Institute of Environmental Health Sciences.
Expert Insight: Why The Slot Matters
Measure the old filter first. David Clark, the Licensed HVAC Technician at Filterbuy HVAC Solutions who reviewed this page, adds a second check: the slot itself.
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.
His method appears in the Filterbuy guide on how to measure your air filter. If you still order the wrong size or MERV rating, the Filterbuy shipping, returns, and exchange policy covers a free exchange within 90 days.
Frequently Asked Questions
How Often Should I Replace A 12x30x2 MERV 11 Filter?
Replace our 12x30x2 MERV 11 filter about every 90 days in a typical home. Move to every 60 days with pets or heavy pollen.
Can I Use A 12x30x1 Filter In A 12x30x2 Slot?
A 12x30x1 filter slides into a 2-inch slot, but it leaves about an inch of open space that lets air bypass the filter.
Is MERV 11 Too High For My Furnace?
MERV 11 is our Superior Residential/Commercial tier, built for homes. Check your HVAC manual to confirm your system takes it, the same way you'd confirm your size. Can't find the manual? Look up the model number or ask a licensed HVAC technician.
What Does 11.5 x 29.5 x 1.75 Mean On A 12x30x2 Filter?
11.5 x 29.5 x 1.75 inches is the actual size of the Filterbuy 12x30x2 filter. We cut length and width half an inch under nominal and 2-inch depth to 1.75 inches so it slides in without binding. That undercut is our convention, not an industry standard.
Are Filterbuy 12x30x2 MERV 11 Filters Made In The USA?
Yes. Our 12x30x2 MERV 11 filters are cut, pleated, and framed to order in our own US plants and ship factory-direct.
Glossary
MERV: Minimum Efficiency Reporting Value, a 1 to 16 scale rating how well a filter captures particles from 0.3 to 10 microns.
ASHRAE Standard 52.2: The laboratory test method from the American Society of Heating, Refrigerating and Air-Conditioning Engineers that assigns MERV ratings.
NAFA: The National Air Filtration Association, an industry group that publishes a user guide to ASHRAE Standard 52.2.
Nominal Size: The rounded size printed on a filter frame, such as 12x30x2, used to order the filter.
Actual Size: The true measured dimensions of a filter, cut smaller than nominal so it fits.
Pleated Filter: A filter with media folded into pleats to add capture surface area.
Filter Bypass: Air that flows around the edges of a filter instead of through its media.
FPR: Filter Performance Rating, a retail scale created by The Home Depot, separate from MERV.
EPA: The U.S. Environmental Protection Agency.
HVAC: Heating, ventilation, and air conditioning.
Filterbuy: A U.S. manufacturer of pleated HVAC air filters that ships factory-direct.
Air Handler: The indoor HVAC cabinet that houses the blower.