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Actual Size: 21.50x21.50x0.75"
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Factory-Direct Low Prices, Made in the USA
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RESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 21.50x21.50x0.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
Actual Size: 21.50x21.50x0.75"
Free Delivery Factory-Direct Low Prices, Made in the USAHassle-Free Returns & Free ExchangesRESIDENTIAL AND/OR COMMERCIAL USE
Change Every 3 Months
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
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: 21.50x21.50x0.75" in → 22x22x1 nominal.
Search by nominal size on our site for the best fit.
If the filter you buy doesn't fit, we'll send you a better size.
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.
Comparable to:FPR: 4-7
MPR: 600-1000
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Comparable to:FPR: 6-9
MPR: 1200-1550
Dust & DebrisDust Mites & ParticlesPollenMoldLintDander
Smoke & Smog
Comparable to:FPR: 10
MPR: 1900-2800
Dust & DebrisDust Mites & ParticlesPollenMoldLintDanderSmoke & Smog
Bacteria
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:
More pleats = more surface area to capture dust and debris, keeping your air cleaner longer.
Pleats are magnetized to attract and trap microscopic particles—like pet dander, pollen, and smoke.
Engineered to resist warping in extreme temperatures and high humidity.
A layer of metal reinforcement keeps pleats evenly spaced and structurally sound—no sagging, even at high airflow.
Assembled with care. Built to perform. Ships fast, free, and reliably from our U.S. facilities.
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.
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:
Efficiency:
High (MERV 8–13) – Traps more particles
Lifespan:
90 days – Long-lasting performance
Air Quality:
Excellent – Cleaner, healthier air
Materials:
Recyclable and durable
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.
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:
For most homes without pets or special air quality concerns. Great for general upkeep and energy efficiency.
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.
For households affected by smoke, pollution, or respiratory conditions, monthly changes ensure maximum protection.
| Nominal Size | 22 x 22 x 1 inches |
| Actual Size | 21.50 x 21.50 x 0.75" 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 |
After manufacturing air filters for over a decade and serving more than two million households, we've learned that seasonal allergy relief starts with one often-overlooked component: your 22x22x1 MERV 11 filter. With roughly 1 in 4 adults suffering from seasonal allergies—and indoor air often containing 2-5 times more pollutants than outdoor air—proper filter management isn't optional, it's essential. Here's exactly how to maximize your MERV 11's allergen-fighting power based on real-world insights from our manufacturing experience and customer feedback.
The 22x22x1 MERV 11 filter is a pleated air filter measuring 21.5" x 21.5" x 0.75" (actual) that captures 85%+ of common allergens including pollen, mold, dust mites, and pet dander.
Key facts:
• Best for: Allergy sufferers, homes with pets, anyone seeking cleaner indoor air
• Replace: Every 45-60 days during allergy season; 60-90 days otherwise
• Captures: Pollen, mold spores, dust mite allergens, pet dander, smog particles
• Pro tip: Run your fan continuously during high-pollen days for maximum filtration
• MERV 11 captures 85%+ of allergens (pollen, mold, dust mites, pet dander)—the ideal balance of filtration and airflow for residential systems.
• Change filters every 45-60 days during allergy season —don't wait for the standard 90-day mark when pollen counts are high.
• Run your fan continuously during peak pollen periods for 4-6 air changes per hour and significantly improved allergen removal.
• Check filter fit and seal —gaps let unfiltered air bypass your MERV 11 entirely, negating its benefits.
• Keep 2-3 replacement filters on hand so you're never caught without during allergy season.
MERV 11 filters occupy the sweet spot for allergy sufferers—they capture 85% or more of particles between 3-10 microns, which includes the major culprits: pollen, dust mite debris, mold spores, and pet dander. Unlike basic fiberglass filters that let these allergens pass through, or hospital-grade MERV 16+ filters that can strain residential HVAC systems, MERV 11 delivers effective protection without restricting airflow.
Standard replacement recommendations of 60-90 days don't account for allergy seasons. During peak pollen periods:
• Spring (March-May): Tree and grass pollen surge—inspect your filter every 3-4 weeks
• Fall (August-October): Ragweed and mold spike—replace at the 45-day mark
• High-pollen days: Check local pollen counts and increase HVAC runtime with fan set to "on" for continuous filtration
1. Check the seal: Gaps around your filter let unfiltered air bypass your MERV 11's media. Run your hand around the edges while the system runs—if you feel air movement, you're losing filtration efficiency.
2. Don't wait for visible dirt: A filter can be loaded with microscopic allergens while still looking clean. Trust the calendar, not your eyes.
3. Run your fan continuously during high-pollen periods: This recirculates and filters your indoor air 4-6 times per hour rather than only when heating or cooling.
4. Pair with good habits: Remove shoes at the door, shower after outdoor activities, and keep windows closed during peak pollen hours (5-10 AM).
For severe allergy sufferers or households with multiple sensitivities, MERV 13 filters capture 85%+ of particles down to 1 micron, including some bacteria and smoke particles. However, always verify your HVAC system can handle the increased airflow resistance before upgrading.
"After manufacturing filters for over a decade and analyzing feedback from millions of customers, we've seen firsthand that allergy sufferers who switch to MERV 11 and maintain a 45-60 day replacement schedule during peak seasons report significant improvements in their symptoms—the filter does the work, but timing makes the difference."
We've compiled the most valuable resources to help you make informed decisions about protecting your family's air quality:
Browse American-made 22x22x1 MERV 11 filters with commercial-grade construction and free shipping. https://filterbuy.com/air-filters/22x22x1/
Learn how MERV ratings work and why MERV 11 hits the sweet spot for allergy protection. https://filterbuy.com/resources/what-is-a-merv-rating-air-filters/
Authoritative information on indoor air pollutants and health effects from the Environmental Protection Agency. https://www.epa.gov/indoor-air-quality-iaq
Monitor allergen levels in your area with CDC's environmental health tracking data. https://www.cdc.gov/nceh/tracking/
Understand the ASHRAE 52.2 standard that defines MERV ratings and particle capture efficiency. https://www.ashrae.org/technical-resources/filtration-disinfection
Step-by-step guide to measuring your filter slot and understanding nominal vs. actual dimensions. https://filterbuy.com/resources/how-to-measure-air-filter/
Set up automatic filter deliveries on your schedule and save 5% on every order. https://filterbuy.com/subscribe/
The science behind MERV 11 filtration for allergy management is clear. Here's what the data shows:
• 25.7% of U.S. adults have seasonal allergies—that's roughly 67 million people seeking relief. Source: https://www.cdc.gov/nchs/products/databriefs/db460.htm
• 90% of time spent indoors—Americans spend the vast majority of their lives breathing indoor air, where pollutant concentrations often exceed outdoor levels. Source: https://www.epa.gov/report-environment/indoor-air-quality
• MERV 11 captures 85%+ of particles 3-10 microns (pollen, mold spores, dust mite allergens) per ASHRAE Standard 52.2 testing. Source: https://www.ashrae.org/technical-resources/filtration-disinfection
Your 22x22x1 MERV 11 filter is one of the most effective—and underutilized—tools for managing seasonal allergies.
Our perspective after a decade in manufacturing:
• Most allergy sufferers don't realize how much their HVAC filter impacts their symptoms
• Timing matters more than filter cost—a $15 MERV 11 replaced on schedule outperforms a premium filter left in too long
• The 45-60 day replacement cycle during allergy season is the single most impactful change most households can make
• Running your fan continuously during high-pollen days provides 4-6 air changes per hour—essentially free extra filtration
The bottom line: Clean air isn't complicated. A quality MERV 11 filter, changed at the right intervals, with your system running optimally, will capture the allergens that make you miserable. It's a small investment in something you can't see—but you'll definitely feel the difference.
Take control of your indoor air quality with these actionable steps:
1. Check your current filter today. Remove it and hold it up to light—if you can't see through it, it's time to replace.
2. Set a calendar reminder. Mark 45 days from your next filter change during spring/fall allergy seasons.
3. Verify your filter size. Check the dimensions printed on your current filter frame to confirm 22x22x1.
4. Order replacement filters now. Keep 2-3 filters on hand so you're never caught unprepared during allergy season.
5. Consider a subscription. Automatic delivery ensures you never miss a filter change and saves 5% on every order.
A: Replace every 45-60 days during peak pollen periods (spring and fall). Standard 90-day recommendations don't account for the increased particle load during allergy season. In homes with pets or multiple allergy sufferers, inspect monthly and replace if visibly loaded.
A: MERV 11 captures 85%+ of particles 3-10 microns, including pollen, mold spores, dust mite debris, and pet dander. It also captures 65-79% of particles 1-3 microns, including some bacteria and fine dust.
A: Both work well for allergies. MERV 11 is ideal for most homes—effective allergen capture with minimal airflow restriction. MERV 13 captures smaller particles but may strain older HVAC systems. If you have severe allergies or respiratory conditions, MERV 13 provides additional protection, but verify your system can handle it first.
A: The actual dimensions are typically 21.5" x 21.5" x 0.75". The 22x22x1 measurement is the "nominal" size for easy ordering. Always measure your filter slot if unsure—filters need a snug fit without gaps to work effectively.
A: Yes, and we recommend it during high-pollen periods. Setting your thermostat fan to "on" instead of "auto" circulates and filters air continuously—typically 4-6 air changes per hour. This significantly increases allergen removal but will require more frequent filter changes (closer to the 45-day mark).
Stop letting seasonal allergies control your comfort at home. Order your American-made 22x22x1 MERV 11 filters from Filterbuy today and experience the difference that quality filtration makes—with free shipping and our satisfaction guarantee.
