Best 16x22.25x2 MERV 8 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 August 12, 2026  ·  Updated August 12, 2026

TL;DR

The 16x22.25x2 MERV 8 air filter is a pleated filter for the return vent or filter slot of a furnace, air conditioner, or heat pump. MERV 8 captures 90% of airborne particles, and it’s the standard choice for most homes. Filterbuy cuts, pleats, and frames this size to order in our own US plants. Check your HVAC manual to confirm which tier your system takes.

Key Takeaways

• 16x22.25x2 is the ordering name. The filter itself is cut a little smaller, and that clearance is what lets it slide in.

• MERV 8 captures 90% of airborne particles. It’s the standard tier for healthy families.

• Your HVAC manual tells you which tier your system takes. Check it the same way you’d check a size.

• Most homes change this filter every 90 days.

• Fast, free 2-day delivery to most US states.

What Is a 16x22.25x2 MERV 8 Air Filter?

It’s a pleated air filter that measures 16 by 22.25 by 2 inches and sits in the return vent or filter slot of your furnace, air conditioner, or heat pump. MERV stands for Minimum Efficiency Reporting Value, which is just the industry scale for how much a filter captures. MERV 8 captures 90% of airborne particles.

Filterbuy cuts, pleats, and frames this size to order in our own US plants. We’re a manufacturer, so you’re buying it from the people who made it.

Finding Your Size

Your size is already printed on the filter you’re replacing. Pull it out and read the frame edge. That number is what you order.

1. Slide the old filter out of the slot.

2. Read the size printed along the frame edge, written as length x width x depth.

3. If there’s no filter in there, or the print has worn off, measure the slot opening instead.

4. Order that size.

Two numbers get talked about, and it helps to know which is which.

If your slot lands on a fraction like 22.25, that fraction is your number. Don’t round it.

A filter that doesn’t fit snugly lets air slip around the edges instead of passing through the pleats. The EPA says the same thing: the filter should fit without leaking air around it and without being bent to fit. If the one you order doesn’t fit, we’ll exchange it free.

Which MERV Tier Should You Choose?

MERV 8 is the standard choice for most homes. MERV 11 is built for allergy sufferers, and also suits homes with pets and pollen. MERV 13 is our hospital-grade tier, and it’s the one to pick for smoke. For odors, the Odor Eliminator uses activated carbon.

MPR and FPR are third-party rating systems owned by 3M and The Home Depot. Filterbuy isn’t affiliated with either. Check your HVAC manual to confirm which tier your system takes.

All three come in 16x22.25x2, so moving up a tier changes one line in your order and nothing about your measurements. Check your HVAC manual to confirm which tier your system takes, the same quick check as confirming a size. Compare them on the 16x22.25x2 air filters hub, or the MERV rating chart.

How Often Should You Change It?

Every 90 days in most homes. Here’s the quicker test: hold the filter up to a light. If light doesn’t pass through the pleats, swap it, whatever the calendar says.

Hold the filter up to a light. If light doesn’t pass through the pleats, swap it, whatever the calendar says.

The EPA notes that manufacturers typically recommend replacement every 60 to 90 days. You’ll also notice a loaded filter before the date sometimes: gray, matted pleats, or weaker airflow at the vents. The Filterbuy guide to how often to change your HVAC filter covers the variables. Or set up auto-delivery and the next one shows up on schedule, 5% off.

How Many Do You Need?

Count returns, not systems. Two return grilles means two filters every change, so a 4 pack covers six months rather than a year. Buying the 16x22.25x2 MERV 8 air filter in a 4 pack or 6 pack drops the per-filter price well below the single-unit rate. Fast, free 2-day delivery to most US states. Browse 2 inch air filters or all MERV 8 air filters.

If Your Size Isn’t Listed

We cut custom air filters to the eighth of an inch. Write down the slot’s length, width, and depth, fractions included, and we’ll build one to those numbers. Custom orders ship on the same schedule as a catalog size.

Supporting Statistics

Three findings from US government sources on why the filter in your return vent matters.

1. Americans spend about 90% of their time indoors.

• Some pollutants run 2 to 5 times higher indoors than outdoors.

• Your filter is one of the few controls you have over that air.

• Source: U.S. EPA, Report on the Environment

2. Your HVAC system runs less than 25% of the time in heating and cooling season.

• Filters only work while the system is moving air.

• That’s a good reason not to let a loaded one sit in the slot.

• Source: U.S. EPA, Guide to Air Cleaners in the Home

3. A clean filter can cut air conditioner energy use by 5% to 15%.

• The Department of Energy calls filter replacement the most important AC maintenance task.

• Source: U.S. Department of Energy, Energy Saver

Frequently Asked Questions

Is 16x22.25x2 a Real Air Filter Size?

Yes. We stock it in MERV 8, MERV 11, and MERV 13. The 22.25 is a true fraction, so some sellers list it as a custom size.

What Does the 2 in 16x22.25x2 Mean?

Depth. Your slot decides it. A 2-inch slot takes a 2-inch filter, and you can’t swap in a deeper one.

How Do I Know My Slot Is 22.25 and Not 22 or 22.5?

Measure the slot opening itself. An old filter can warp, so it’s the less reliable guide. Read to the nearest eighth, and if it lands on a fraction, that’s your number. Don’t round it.

Which MERV Should I Get for My System?

Check your HVAC manual. It tells you which tier your system takes, and it’s the same quick check as confirming a size.

Where Are Filterbuy Filters Made?

We cut, pleat, and frame our filters to order in our own US plants. We’re a manufacturer, not a reseller.

Glossary

• MERV: Minimum Efficiency Reporting Value. The industry scale for how much a filter captures. Higher numbers capture more.

• Nominal size: The size printed on the frame. It’s the one you order.

• Actual size: What the filter measures. It’s cut a little smaller so it slides into the slot.

• MPR and FPR: Third-party rating systems owned by 3M and The Home Depot. Filterbuy isn’t affiliated with either.

• Pleated media: Filter material folded into pleats, which packs more surface area into the same frame.

• Filterbuy: A second-generation, family-owned American air filter manufacturer.
  

About the Author and Reviewer

Michelle Wan is Brand Manager and Air Quality Writer at Filterbuy, where she turns MERV ratings, filtration, and HVAC questions into plain-English advice and fronts much of the brand’s educational video content (B.A., UC Santa Cruz). She works directly with Filterbuy’s manufacturing teams and writes from how filters are built and used.

Reviewed by David Clark, Licensed HVAC Technician, Filterbuy HVAC Solutions.

Filterbuy is a second-generation, family-owned American manufacturer. We cut, pleat, and frame our filters to order in our own US plants, in 600+ sizes plus custom, shipped factory-direct.

Sources: U.S. EPA, Guide to Air Cleaners in the Home; U.S. EPA, Report on the Environment; U.S. Department of Energy, Energy Saver.