MERV vs. MPR vs. FPR: What's the Difference?

If you've ever shopped for a furnace filter, you've probably noticed ratings like MERV, MPR, and FPR on the packaging. At first glance, they all seem to measure the same thing but they aren't interchangeable.

Understanding these ratings can help you choose a filter that captures the particles you care about without restricting airflow in your HVAC system. While all three systems evaluate filtration performance, MERV is the industry standard used by most HVAC professionals and manufacturers.

In this guide, we'll explain what each rating means, how they compare, and which one you should use when shopping for replacement furnace filters.

What Is MERV?

MERV stands for Minimum Efficiency Reporting Value. It was developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) as a standardized way to measure how effectively an air filter captures airborne particles. 

Residential furnace filters typically range from MERV 1 to MERV 13, with higher numbers capturing smaller particles.

Think of MERV ratings as a scale: the higher the number, the finer the particles the filter can capture. Lower-rated filters are effective at trapping everyday dust and lint, while higher-rated filters are better equipped to capture smaller particles like pollen, pet dander, smoke, and other airborne contaminants.

Because MERV is an industry standard, it allows homeowners to compare filters across different manufacturers without relying on brand-specific rating systems.

What Is MPR?

MPR stands for Microparticle Performance Rating.

Unlike MERV, MPR is a proprietary rating system developed by Filtrete. It focuses primarily on how well a filter captures very small airborne particles.

While MPR can be helpful when comparing Filtrete filters to other Filtrete filters, it isn't used by other manufacturers. That means you can't directly compare an MPR rating on one brand to another brand unless you first understand its approximate MERV equivalent.

What Is FPR?

FPR stands for Filter Performance Rating.

This rating system was created by The Home Depot for many of the filters it sells. Similar to MPR, it is designed to help customers compare filters within that retail ecosystem.

Like MPR, FPR isn't an industry standard. It uses a different numerical scale than MERV, making direct comparisons difficult without a conversion chart.

MERV vs. MPR vs. FPR Comparison

Although the numbers look very different, these systems often represent similar filtration performance.

Keep in mind: These conversions are approximate. MERV, MPR, and FPR are based on different testing and rating methodologies, so they shouldn't be considered exact equivalents.

Which Rating Should You Use?

For most homeowners, MERV is the easiest and most reliable rating to use.

Because it is recognized throughout the HVAC industry, you'll find MERV ratings on filters from many manufacturers, not just one retailer or brand.

If you're replacing your home's furnace filter, start by checking your current filter or your HVAC owner's manual for the recommended MERV rating. Installing a filter with a significantly higher rating than your system was designed for can reduce airflow and affect system performance.

Which MERV Rating Is Right for Your Home?

While every home is different, these general recommendations work well for most households.

MERV 8

For most homeowners, a MERV 8 filter is the sweet spot. It provides reliable everyday filtration while maintaining excellent airflow, making it a great choice for homes without significant indoor air quality concerns. If you're simply looking to keep your HVAC system protected and reduce everyday dust and pollen, MERV 8 is often the recommended option. 

MERV 11

If you have pets, seasonal allergies, or simply want cleaner indoor air, MERV 11 offers a noticeable step up in filtration. It captures smaller airborne particles than a MERV 8 filter while still providing good airflow for most residential HVAC systems. Many homeowners find MERV 11 strikes an excellent balance between filtration performance and system efficiency. 

MERV 13

A MERV 13 filter provides the highest level of filtration commonly recommended for residential systems. It's a popular choice for homeowners concerned about smoke, fine airborne particles, or maximizing indoor air quality. However, not every HVAC system is designed to handle a MERV 13 filter, so it's important to check your owner's manual or consult an HVAC professional before upgrading. 

Does a Higher Rating Always Mean a Better Filter?

Nope.

A higher-rated filter captures smaller particles, but it can also create more airflow resistance. Your furnace or air conditioner must be designed to handle that increased resistance.

For many homes, a quality MERV 8 or MERV 11 filter provides an excellent balance between filtration and airflow.

The "best" filter isn't always the one with the highest number it's the one that's appropriate for your HVAC system and your indoor air quality needs.

The Bottom Line

MERV, MPR, and FPR all provide information about a filter's performance, but they aren't the same rating system.

If you're comparing filters across different brands, MERV is the rating that matters most. It's the industry standard used by HVAC professionals and makes it much easier to compare products fairly.

Once you know the MERV rating recommended for your system, choosing a replacement filter becomes much simpler.

Want to make filter changes one less thing to remember? Check out our Filter Subscription Program, and we'll deliver the right filters to your door when it's time for a replacement.

Frequently Asked Questions

Is MERV better than MPR?

Neither rating is inherently better. MERV is simply the industry-standard system used by most HVAC manufacturers, while MPR is a proprietary rating used only on Filtrete filters.

Is FPR the same as MERV?

No. FPR is a retail-specific rating system and uses a different numerical scale. While there are approximate comparisons, the ratings are not directly interchangeable.

What MERV rating do most homes use?

Most residential HVAC systems use MERV 8 or MERV 11 filters. Always check your HVAC manufacturer's recommendations before choosing a higher-rated filter.

Can I replace a MERV 8 filter with a MERV 13 filter?

Maybe. Some HVAC systems are designed to handle higher-efficiency filters, while others are not. Consult your owner's manual or an HVAC professional before making the switch.

Which rating should I shop by?

Whenever possible, shop by MERV. Because it is the industry standard, it makes comparing filters across different brands much easier.