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Table 1 Infectious-particle-size-weighted filtration efficiency for a range of HVAC air filters [54]

From: Estimating the nationwide transmission risk of measles in US schools and impacts of vaccination and supplemental infection control strategies

Filter Type Range Mean
MERV 4 7.7–12.7% 10.5%
MERV 7 35.5–47.4% 42.2%
MERV 13 81.6–89.2% 85.9%
MERV16 95.0% 95.0%
HEPA 99.9% 99.9%