17x22x1 vs 16x20x1 Air Filters: Which Fits My HVAC System?
At Filterbuy, we’ve seen it countless times—homeowners frustrated after discovering their “standard” air filter doesn’t actually fit. The truth is, even small size differences like 17x22x1 vs 16x20x1 can make a big impact on how well your HVAC system performs. Based on years of manufacturing and testing millions of filters in real homes, we’ll show you how to measure accurately, choose the right size, and avoid the airflow issues we see most often. Here’s how to get the perfect fit for cleaner, more efficient air—every time.
Quick Answers
A 17x22x1 air filter is a standard HVAC filter size designed to trap dust, pollen, and airborne particles while maintaining proper airflow. Its actual size is slightly smaller (≈16¾" x 21¾") to ensure a tight fit.
Filterbuy Insight:
From years of real-world testing, we’ve found that using a precisely fitted 17x22x1 filter improves system efficiency, reduces strain, and keeps indoor air cleaner—without restricting airflow. Always measure your slot for accuracy and replace every 60–90 days for best results.
Top Takeaways
Size matters. Even a ¼-inch difference can affect airflow, efficiency, and air quality.
Proper fit = Better performance. A snug filter prevents leaks and reduces strain on your HVAC system.
Right size = Cleaner air. Correct dimensions trap more dust, pollen, and allergens.
Measure before buying. Check your filter slot or manual to ensure the perfect fit.
Precision filters make it easy. Filterbuy’s U.S.-made, custom-cut filters deliver clean air—without the hassle.
When it comes to air filters, a small difference in size can have a big impact on performance. The numbers on your filter—like 17x22x1 or 16x20x1—represent its length, width, and thickness in inches, but here’s the catch: these are nominal sizes, not exact measurements. A 17x22x1 filter actually measures closer to 16¾" x 21¾", while a 16x20x1 filter is about 15½" x 19½".
That fraction of an inch determines whether your filter seals properly inside your HVAC system. A filter that’s too small leaves gaps where unfiltered air slips through, carrying dust and allergens back into your home. One that’s too large won’t fit at all—or may bend, reducing airflow and efficiency.
To find the right size, check your system’s manual or measure the filter slot itself, then match it to the closest nominal size. If your system requires an uncommon dimension, Filterbuy can custom-build your filter to the exact measurements—so you never have to force a fit or compromise air quality again.
With the right size in place, you’ll enjoy better airflow, cleaner indoor air, and lower energy costs—all from a filter that truly fits.
“At Filterbuy, we’ve tested thousands of HVAC systems across the country, and one thing is clear—fit matters more than most homeowners realize. Even a quarter-inch gap around your filter can let unfiltered air bypass the system, undoing all your efforts for cleaner air. That’s why we precision-cut every filter and offer custom sizing—because real performance starts with a perfect fit.”
Top 7 Resources to Help You Find the Perfect 17x22x1 Air Filter Fit
Finding the right air filter shouldn’t feel like guesswork. We’ve rounded up the most helpful resources from trusted HVAC experts to help you understand what really matters—fit, airflow, and clean, healthy air for your home. These guides walk you through how to measure, compare, and choose confidently so your HVAC system can do what it does best: keep your air clean and your energy bills low.
Get the Basics Right with Filter King
17x22x1 Air Filters for AC & Furnace | Filter King
Start with the fundamentals. This guide explains how 17x22x1 filters are measured, why nominal vs. actual size matters, and how different MERV ratings affect your indoor air quality and system performance.
Avoid the “Doesn’t Fit” Frustration | Go Home Heating
Why Your Store-Bought HVAC Filter Might Not Fit | Go Home Heating
If you’ve ever bought a filter that was just slightly off, you’re not alone. This article walks you through the real reason store-bought filters sometimes don’t fit and how to measure correctly to prevent leaks and wasted airflow.
Measure Once, Fit Right Every Time | Bob’s Repair
Air Filter Sizes Explained: Find Your HVAC Fit | Bob’s Repair
See how simple it is to measure your filter slot accurately. This visual guide shows how to identify your exact size and choose the right replacement—without the trial and error.
Change It Like a Pro | All Filters
How to Change Home Air Filter: Air Filter Sizes | All Filters
Once you’ve found your perfect fit, this quick guide helps you change it safely and correctly. You’ll also learn how regular replacements keep your air cleaner and your HVAC system running efficiently.
Learn from the Experts | Carrier
Air Filter Sizes: What Size Air Filter Do I Need? | Carrier
Take it from the pros—this manufacturer-backed guide explains how filter sizing and thickness influence HVAC efficiency, energy use, and long-term reliability.
Decode Filter Sizing Myths | Nordic Pure
Nominal Size vs. Actual Size: A Guide to Measuring AC & Furnace Air Filters Correctly | Nordic Pure
That “off by a quarter inch” difference isn’t a mistake—it’s the key to a proper seal. This resource breaks down why precision sizing matters for cleaner air and better system performance.
Double-Check Your Size with a Brand & Model Chart | Atomic Filters
Air Filter Size Chart 2025: Find Your Exact Size by Brand & Model Number | Atomic Filters
If you’re still unsure, this easy-to-scan chart helps confirm your system’s exact size and model match—perfect for making sure 17x22x1 is the right fit before you order.
Pro Tip from Filterbuy:
Even the best filter can’t do its job if it doesn’t fit right. We precision-make every 17x22x1 filter here in the U.S.—and if your system needs a custom size, we’ll build it to your exact specs. Because clean air should never be a guessing game.
Supporting Statistics & Real-World Insights
Getting the right filter size isn’t just about fit—it’s about airflow, energy savings, and healthier air. Here’s what national data and Filterbuy’s hands-on experience reveal:
Energy Efficiency Starts with Airflow
Heating and cooling = 52% of home energy use (EIA, 2020).
A properly fitted filter keeps air moving freely and prevents system strain.
Our insight: Precision sizing helps your HVAC run smoother and last longer.
???? Source: U.S. EIA – Residential Energy Consumption Survey
Proper Fit = Lower Energy Bills
Nearly half of the average energy bill—over $900/year—goes to heating and cooling (DOE).
Replacing a clogged or loose-fitting filter reduces energy waste immediately.
Our insight: We’ve seen customers cut energy costs by improving filter fit alone.
???? Source: U.S. Department of Energy – Energy Saver Guide
Clean Air Protects Health
26.8 million Americans (8.2%) live with asthma (CDC, 2022).
Tight-sealing filters capture allergens, dust, and pet dander.
Our insight: Properly sized filters reduce triggers and improve daily air quality.
???? Source: CDC – Asthma Surveillance Data
Small Gaps, Big Consequences
NIOSH warns: filters must be properly sized and sealed to prevent air bypass.
Even a ¼-inch gap lets unfiltered air leak through your system.
Our insight: Every Filterbuy filter is precision-cut and tested to seal perfectly.
???? Source: CDC/NIOSH – Ventilation in Buildings
Bottom Line:
The data—and our decade of manufacturing experience—say the same thing:
✅ Measure precisely.
✅ Choose the right size.
✅ Keep your HVAC efficient and your air clean.
Final Thoughts & Expert Opinion
Choosing the right air filter size isn’t guesswork—it’s precision. Here’s what years of hands-on testing and customer feedback have taught us:
Fit First, Always
Even a small size mismatch can cause air leaks and system strain.
The right size ensures smooth airflow and consistent performance.
Clean Air Starts with Precision
A well-fitted filter traps more dust, pollen, and allergens.
Better seal = cleaner air, healthier home, and less HVAC wear.
Real-World Results
Customers report noticeable airflow improvements after correcting the filter size.
Proper fit often leads to fewer maintenance calls and lower energy costs.
Our Perspective
At Filterbuy, we believe clean air isn’t a luxury—it’s a standard.
That’s why every filter we make is precision-cut, tested, and built in the U.S. to fit exactly as it should. When your filter fits right, your home breathes right—simple as that.
Frequently Asked Questions
Q: What does 17x22x1 mean?
It’s the nominal size (rounded label size).
Actual size: ≈16¾" x 21¾" x ¾".
Designed to fit standard HVAC slots snugly.
Q: How do I know if it fits my system?
Measure the filter slot, not the old filter edge.
If the opening is near 17x22x1, it’s the right match.
Filterbuy can custom-build exact sizes for a perfect seal.
Q: What MERV rating is best?
MERV 8–11: Best balance of airflow + filtration.
MERV 13: Ideal for allergy or asthma concerns.
Based on Filterbuy lab testing for real homes.
Q: How often should I replace it?
Every 60–90 days for normal use.
Every 30–45 days with pets or heavy use.
Regular changes = smoother airflow + cleaner air.
Q: Can I use a “close” size instead?
No. Even a small gap causes air bypass.
Unfiltered air = dust, allergens, and strain on your system.
Filterbuy Insight:
Precision matters. The right 17x22x1 filter improves air quality, boosts efficiency, and keeps your HVAC running like new.
Learn more about HVAC Care from one of our HVAC solutions branches…
Filterbuy HVAC Solutions - Miami FL - Air Conditioning Service
1300 S Miami Ave Apt 4806 Miami FL 33130
(305) 306-5027
https://maps.app.goo.gl/Ci1vrL596LhvXKU79
