MERV Rating - Actual Particle Size Removed and Efficiency in Percentage

MERV Rating	0.3 – 1.0 Microns*	1.0 – 3.0 Microns	3.0 – 10.0 Microns
1	-	-	< 20%
2	-	-	< 20%
3	-	-	< 20%
4	-	-	< 20%
5	-	-	≥ 20%
6	-	-	≥ 35%
7	-	-	≥ 50%
8	-	≥ 20%	≥ 70%
9	-	≥ 35%	≥ 75%
10	-	≥ 50%	≥ 80%
11	≥ 20%	≥ 65%	≥ 85%
12	≥ 35%	≥ 80%	≥ 90%
13	≥ 50%	≥ 85%	≥ 90%
14	≥ 75%	≥ 90%	≥ 95%
15	≥ 85%	≥ 90%	≥ 95%
16	≥ 95%	≥ 95%	≥ 95%

*A human hair is roughly 20-40 microns in size, while viruses (the smallest airborne microbes) range in size from .01 to 0.3 micron.

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