Poor indoor air quality within schools has long been identified as one of the leading causes of student and teacher illnesses. Ever since the 1920s, public schools have been aware of the importance of ventilation and humidity control. In 1923, the New York State Commission on Ventilation found that pupils in fan-ventilated rooms suffered 70 percent more upper respiratory illnesses compared to students in window-ventilated classrooms. With crowding an ongoing issue in public schools, temporary humidity control and adequate ventilation are vital to keeping infectious diseases and allergens at bay.
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