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r <br /> Results <br /> The school houses approximately 800 seventh through twelfth grade students and <br /> approximately 85 staff. Tests were taken en during normal operations. Results appear in Table 1. <br /> Discussion <br /> Ventilation <br /> It can be seen from Table 1 that carbon dioxide levelswere above 800 parts per million <br /> (ppm) in 37 of 90 areas at the time of the assessment, indicating a lack of air exchange in a <br /> number of the areas surveyed. It is important to note that several classrooms had open windows <br /> and/or were empty/sparsely populated, which typically reduces carbon dioxide levels. Carbon <br /> dioxide levels would be expected to be higher with increased occupancy and/or windows closed. <br /> Fresh air is supplied to most classrooms by unit ventilator uni ent systems (Picture 1). <br /> A univent draws air from the outdoors through a fresh air intake located on the exterior wall of <br /> the building (Picture . i et m air from the classroom is drawn through an air intake located at <br /> a <br /> the base of the unit(Figure 1). Fresh and return air are mixed, filtered, heated and provided t <br /> classrooms through ars air diffuser located in the top of the unit. At the time of the 1AQ <br /> assessment, unl encs were operating in the large majority of the areas surveyed; however, some <br /> had been deactivated. Univents in some areas had items stored on top, which can restrict airflow <br /> (Picture ,- Table 1). In order for univents to provide fresh air as designed, intakes/diffusers must <br /> remain free of obstructions. Importantly, these units must remain 'on' and he allowed to operate <br /> while rooms are occupied, <br /> 4 <br />