MERV RATING CHART
MERV RATING CHART
Standard 52.5 Minimum
Efficiency Reporting Dust Spot
Value
Efficiency
Arrestance
Typical Controlled Contaminant
20
n/a
n/a
< 0.30 pm particle size
19
n/a
n/a
Virus (unattached)
18
n/a
n/a
Carbon Dust
17
n/a
n/a
All Combustion smoke
16
n/a
n/a
.30-1.0 pm Particle Size
15
>95%
n/a
All Bacteria
14
90-95%
>98% Most Tobacco Smoke
13
89-90%
>98% Proplet Nuceli (Sneeze)
12
70-75%
>95% 1.0-3.0 pm Particle Size
Legionella
11
60-65%
>95% Humidifier Dust
Lead Dust
10
50-55%
>95% Milled Flour
Auto Emissions
9
40-45%
>90% Welding Fumes
8
30-35%
>90% 3.0-10.0 pm Particle Size
Mold Spores
7
25-30%
>90% Hair Spray
Fabric Protector
6
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