The Difference Between FPR, MPR, and MERV Ratings

A Complete Guide by Airex Filter Corporation

Understanding air filter ratings is essential when choosing the right filtration solution for your home, office, or industrial facility. At Airex Filter Corporation, we help customers navigate the differences between MERV, MPR, and FPR so they can make informed decisions that improve air quality and system performance.

Understanding Air Filter Rating Systems

There are three primary rating systems used to measure how effectively an air filter captures airborne contaminants:

• MERV (Minimum Efficiency Reporting Value)

• MPR (Microparticle Performance Rating)

• FPR (Filter Performance Rating)

Each system was developed by a different organization and uses its own scale, which can sometimes create confusion for consumers. Let’s break them down.

What Is a MERV Rating?

MERV (Minimum Efficiency Reporting Value) is the most widely recognized and trusted air filter rating system in the industry. It was developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers to provide a standardized way to evaluate filter performance.

• Scale: 1–16 (commonly used range; up to 20 in specialized applications)

• Purpose: Measures a filter’s ability to capture particles of varying sizes

• Key Insight: The higher the MERV rating, the more efficient the filter

Typical Usage:

• MERV 6–8: Basic residential filtration

• MERV 11–13: Homes, offices, and commercial buildings

• MERV 14–16+: Hospitals, cleanrooms, and industrial environments

At Airex Filter Corporation, MERV-rated filters are the industry standard we recommend due to their consistency, reliability, and universal acceptance.

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

While MERV is the industry benchmark, MPR and FPR are proprietary systems created by manufacturers and retailers.

MPR (Microparticle Performance Rating)

Developed by 3M, MPR focuses specifically on the filter’s ability to capture microscopic particles.

• Scale: 300–2800

• Focus: Particles between 0.3 to 1 micron

• Key Insight: Higher MPR = better capture of fine particles like smoke and bacteria

FPR (Filter Performance Rating)

Created by The Home Depot, FPR is used primarily for filters sold in their stores.

• Scale: 4–10

• Focus: Overall filtration performance, including particle capture and airflow resistance

• Key Insight: Higher FPR = better overall filtration performance

Why MERV Matters Most

While MPR and FPR can be helpful within specific brands, MERV remains the universal standard used across the HVAC and air filtration industry. It allows for accurate comparisons between different manufacturers and ensures you’re selecting the right filter for your application.

At Airex Filter Corporation, we prioritize MERV ratings when helping customers choose filters because they provide:

• Consistency across brands

• Proven performance standards

• Compatibility with HVAC system requirements

MERV Comparison Chart

Here’s a simplified comparison of common MERV ratings and their equivalents:

MERV Rating	Contaminants Captured	Comparable MPR	Comparable FPR
MERV 6	Dust, lint, pollen	MPR 300	N/A
MERV 8	Dust, pollen, mold spores, dust mites	MPR 600	FPR 5
MERV 11	Pet dander, smoke, smog, allergens	MPR 1000–1200	FPR 7
MERV 13	Bacteria, some viruses, fine particles	MPR 1500–2000	FPR 10

Choosing the Right Air Filter

Selecting the right filter depends on your environment, air quality goals, and HVAC system capabilities. Higher-rated filters capture more contaminants—but they must also be compatible with your system to maintain proper airflow.

Airex Filter Corporation specializes in helping customers find the perfect balance between:

• Filtration efficiency

• System performance

• Indoor air quality

Final Thoughts

Understanding the difference between MERV, MPR, and FPR ratings is key to making a smart air filtration decision. While all three systems measure performance, MERV is the most reliable and widely accepted standard across the industry.

If you’re unsure which filter is right for your application, the experts at Airex Filter Corporation are here to help guide you every step of the way.