2022 Yes https://doi.org/10.1016/j.atmosenv.2022.119112 Son, Sungwan Asia Experimental Modeling Students Ventilation rates Particulate Matter (PM) Infections Other Cross-infection Floor return Full-scale school ventilation performance test-bed Indoor air quality School classrooms Ventilation Full-scale testbed and CFD modeling in Korean classrooms assessed ventilation configurations and diffuser placements; floor return systems reduced PM2.5 levels and cross-infection risks compared to ceiling return. Findings offer design guidance to improve IAQ and student health protection in schools.