MERV vs. FPR vs. MPR: Comparing Filter Rating Systems

MERV vs. MPR vs. FPR, at a glance: Use the exact filter’s MERV rating to compare particle capture across brands. MPR is 3M/Filtrete’s rating, while FPR is The Home Depot’s system. Their numbers are not interchangeable: Filtrete MPR 1500 corresponds to MERV 12, while MPR 1900 corresponds to MERV 13 in 3M’s comparison chart. Check dimensions and HVAC compatibility before buying.

Do you find purchasing an air filter for your home a harrowing experience? Part of the confusion surrounding air filters is the various rating systems and their numerical scales. Let’s take a look at the purpose of filter rating systems, the three most popular systems and how they compare. 

What Are Filter Ratings?

Filter ratings describe particle capture, not whether a particular filter fits your furnace or how long it will last. Compare the rating alongside the exact product model, dimensions and equipment requirements. A higher number on one scale cannot be compared directly with a number on another scale.

MERV vs. MPR. vs. FPR Rating Systems

MERV

MERV stands for minimum efficiency reporting value. It uses the ASHRAE test method to compare capture across particle-size ranges from 0.3 to 10 micrometers. EPA’s MERV table runs from 1 to 16 and lists HEPA separately. A rating describes tested capture efficiency, not a promise to remove every pollutant from a home.

• MERV 1–4: Less than 20% average capture in the 3–10 micrometer range.
• MERV 8: At least 20% in the 1–3 micrometer range and 70% in the 3–10 micrometer range.
• MERV 11: At least 20% in the 0.3–1 micrometer range, 65% in the 1–3 range and 85% in the 3–10 range.
• MERV 13: At least 50% in the 0.3–1 micrometer range, 85% in the 1–3 range and 90% in the 3–10 range.

Home Air Filters: Looking to better understand MERV ratings and how to choose the best filter for your home? We break down all things MERV here →

MPR

Microparticle performance rating (MPR) is 3M/Filtrete’s measure of capture for particles from 0.3 to 1 micrometer. The manufacturer publishes MPR and MERV together for its filters. Those product pairings are useful when shopping, but they are not a mathematical conversion for every brand.

• MPR 300 and 600: Listed as MERV 5 and MERV 7, respectively, in 3M’s chart.
• MPR 1000 and 1200: Both listed as MERV 11.
• MPR 1500: Listed as MERV 12, not MERV 13.
• MPR 1900 and 2200: Both listed as MERV 13.
• MPR 2500 and 2800: Both listed as MERV 14. Check the exact current product label when ordering.

FPR

Filter performance rating (FPR) is The Home Depot’s comparison system. Its buying guide describes a 1–12 scale that considers large-particle capture, small-particle capture and weight gain during use. Use the exact product’s listed MERV rating for cross-brand comparisons rather than treating FPR as a second name for MERV.

• FPR is retailer-specific: It helps compare filters sold through The Home Depot, rather than defining a universal filter standard.
• One MERV rating can have different FPR labels: The product examples below include both FPR 10 and FPR 12 filters listed as MERV 13.
• Check the specification, not just the tier name: A label such as “Premium” or “Ultimate” does not establish compatibility with your equipment.

Do Filter Rating Systems Matter?

Yes. MERV provides a common particle-capture comparison across filter brands, while MPR and FPR add manufacturer or retailer information. None of these numbers, on its own, establishes airflow resistance, service life or a health outcome.

Particle filtration also has limits. A smoke or odor claim does not mean a filter removes the gases in smoke or all odor-causing compounds. EPA distinguishes particle filters from filters designed for gases. Check the specific product’s gas-removal information instead of inferring it from MERV, MPR or FPR.

These examples come from 3M’s published MPR/MERV chart. Match the exact filter series and current label; equal MERV values do not make every product identical.

For FPR, use product-specific pairs rather than a universal conversion chart. These two Home Depot listings demonstrate why: both state MERV 13 even though their FPR values differ. They are label examples, not product recommendations or fit guarantees.

Choose Your Air Filter Wisely

Before you buy: Record the required filter dimensions, including depth and actual size, plus the approved filter type for your equipment. Compare the exact product’s MERV value and replacement instructions. If compatibility is unclear, ask your HVAC technician to confirm the filter specification and system airflow before upgrading.

For higher-efficiency filtration, EPA recommends MERV 13 or the highest rating the system can accommodate. The fan, filter slot and complete installation matter. See our filter-airflow guide for safe checks and questions to bring to a technician.

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After choosing a compatible filter, follow the equipment instructions for installation and the product’s maintenance schedule. Use our filter-replacement guide to plan inspections. A filter rating alone does not establish that a home’s air is healthy.

Sources & Further Reading

• U.S. EPA: What is a MERV rating?
• U.S. EPA: Guide to Air Cleaners in the Home
• 3M/Filtrete: MPR vs. MERV comparison chart
• The Home Depot: Air Filter Buying Guide, used for its FPR definition; product-specific MERV pairs are linked in the table above.

Reviewed November 2026 against EPA guidance, 3M’s comparison chart and the linked retailer specifications. Verify the current label for the exact filter you buy.