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Table 4 Summary of HVAC system types in U.S. schools based on the U.S. Energy Information Administration, Commercial Buildings Energy Consumption Survey

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

School Type HVAC System Type Heating Cooling
Primary School Central-Forced-Air 41% 26%
Ductless with Air Filter 47% 63%
Ductless without Air Filter 12% 10%
Secondary School Central-Forced-Air 43% 35%
Ductless with Air Filter 41% 54%
Ductless without Air Filter 16% 11%