cdc air filter recommendations schools

Indoor Air Quality in Schools 101: How Air Quality in Classrooms, Classroom Ventilation Requirements, and the Right School HVAC MERV Filters Protect Student Health and Attendance

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An image of an HVAC professional on a school rooftop, holding a new, pleated MERV-rated filter while standing next to used filters leaning against the commercial air conditioning unit.

Walk into a typical 1980s elementary school in late August, and you’ll find a maintenance lead pulling 20×25 filters out of a rooftop unit, holding one up to the light, and frowning. The cardboard says MERV 8. The system was sized for MERV 8. The CDC, ASHRAE, and most school nurses now want MERV 13. … Read more