MERV Rating Guide — What Do MERV Ratings Mean?

MERV stands for Minimum Efficiency Reporting Value. It's a scale from 1-20 that measures how effectively a filter captures particles. Higher MERV = catches smaller particles. But higher isn't always better for your home.

MERV Rating Breakdown

MERV	Particle Size	Catches	Typical Use
1–4	>10 μm	Pollen, dust mites, carpet fibers	Minimal residential, protects HVAC unit
5–8	3–10 μm	Mold spores, pet dander, dust, cement dust	Average residential
9–12	1–3 μm	Lead dust, auto emissions, flour	Superior residential, better air quality
13–16	0.3–1 μm	Bacteria, tobacco smoke, virus carriers	Hospital-grade residential, severe allergies
17–20	<0.3 μm	Viruses, carbon dust, sea salt	Cleanrooms, surgery suites — NOT for home HVAC

MERV vs MPR vs FPR

MPR (Micro-Particle Performance Rating) — 3M/Filtrete's proprietary rating. MPR 300 ≈ MERV 5, MPR 600 ≈ MERV 8, MPR 1000 ≈ MERV 11, MPR 1500 ≈ MERV 12, MPR 1900 ≈ MERV 13.

FPR (Filter Performance Rating) — Home Depot/Honeywell's proprietary scale (1-10). FPR 4 ≈ MERV 6, FPR 7 ≈ MERV 8-9, FPR 9 ≈ MERV 11, FPR 10 ≈ MERV 12-13.

What MERV Should You Use?

MERV 8 — Best for most homes. Good filtration, low airflow restriction.
MERV 11 — Upgrade if you have pets or mild allergies.
MERV 13 — Only if your HVAC manual says it's compatible. Great for severe allergies and smoke.

⚠️ Warning: Using a MERV rating higher than your system supports restricts airflow, increases energy costs, and can damage your HVAC unit. Check your owner's manual or ask your HVAC technician.

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