Describes a case of an elementary school which suffers indoor air quality problems as a result of the application of hot coal-tar to the roof, causing major health concerns. Eight roof-mounted air handling units provided heating, ventilation and air conditioning. The space above the ceiling served as the return-air plenum. Four AHUs provided ventilation to most classrooms with variable air volume boxes controlling airflow. Outdoor air intake dampers on each AHU supplied 10% outdoor air to each wing of the school.
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