MERV Rating | How Clean is Your Air With This Rating | What is Being Filtered |
MERV 1 | 20% of the reachable air is filtered to capture 3-10 microns (µm) particles | Pollen, Dust mites, Sanding dust, Spray paint dust, Textile/Carpet fibers |
MERV 2 | 20% of the reachable air is filtered to capture 3-10 µm particles | Pollen, Dust mites, Sanding dust, Spray paint dust, Textile/Carpet fibers |
MERV 3 | 20% of the reachable air is filtered to capture 3-10 µm particles | Pollen, Dust mites, Sanding dust, Spray paint dust, Textile/Carpet fibers |
MERV 4 | 20% of the reachable air is filtered to capture 3-10 µm particles | Pollen, Dust mites, Sanding dust, Spray paint dust, Textile/Carpet fibers |
MERV 5 | 20-35% of the reachable air is filtered to capture 3-10 µm particles | Mold spores, Dust lint, Cement dust, Cooking dusts |
MERV 6 | 35-50% of the reachable air is filtered to capture 3-10 µm particles | Mold spores, Dust lint, Cement dust, Cooking dusts |
MERV 7 | 50% of the reachable air is filtered to capture 3-10 µm particles | Mold spores, Dust lint, Cement dust, Cooking dusts |
MERV 8 | 70% of the reachable air is filtered to capture 3-10 µm particles, and less than 20% for 1-3 µm particles | Mold spores, Dust lint, Cement dust, Cooking dusts |
MERV 9 | 85% of the reachable air is filtered to capture 3-10 µm particles, less than 50% for 1-3 µm particles, less than 20% for .3-1 µm particles | Lead dusts, Auto fumes, Bacteria, Pet dander |
MERV 10 | More than 85% of the reachable air is filtered to capture 3-10 µm particles, 50-64% for 1-3 µm particles, less than 20% for .3-1 µm particles | Lead dusts, Auto fumes, Bacteria, Pet dander |
MERV 11 | More than 85% of the reachable air is filtered to capture 3-10 µm particles, 65-79% for 1-3 µm particles, less than 20% for .3-1 µm particles | Lead dusts, Auto fumes, Bacteria, Pet dander |
MERV 12 | More than 90% of the reachable air is filtered to capture 3-10 µm particles, 80-90% for 1-3 µm particles, less than 20% for .3-1 µm particles | Lead dusts, Auto fumes, Bacteria, Pet dander |
MERV 13 | More than 90% of the reachable air is filtered to capture 1-10 µm particles, less than 75% for .3-1 µm particles | Biological pathogens, Virus particles |
MERV 14 | More than 90% of the reachable air is filtered to capture 1-10 µm particles, 75-84% for .3-1 µm particles | Biological pathogens, Virus particles |
MERV 15 | More than 90% of the reachable air is filtered to capture 1-10 µm particles, 85%-94& for .3-1 µm particles | Biological pathogens, Virus particles |
MERV 16 | More than 95% of the reachable air is filtered to capture 1-10 µm particles, more than 90% for .3-1 µm particles | Biological pathogens, Virus particles |
MERV 17 | More than 99% of the reachable air is filtered to capture 1-10 µm particles, 99.97% for .3-1 µm particles & | Biological pathogens, Virus particles |
MERV 18 | More than 99% of the reachable air is filtered to capture 1-10 µm particles, 99.997% for .3-1 µm particles | Biological pathogens, Virus particles |
MERV 19 | More than 99% of the reachable air is filtered to capture 1-10 µm particles, 99.9997% for .3-.1 µm particles | Biological pathogens, Virus particles |
MERV 20 | More than 99% of the reachable air is filtered to capture 1-10 µm particles, 99.99997% for .3-.1 µm particles | Biological pathogens, Virus particles |