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Exhaust ventilation for classrooms is provided by ceiling or wall-mounted vents powered <br /> by rooftop motors(Pictures 4 and . The exhaust system was operating at the time of <br /> assessment. <br /> The heating, ventilating and air-conditioning (HVAQ systems for interior rooms and <br /> common areas (e.g., gymnasium, locker rooms, auditorium) is provided by air-handling units <br /> (AHUs) located in mechanical rooms, mounted from ceilings or located on the roof. Fresh air is <br /> distributed via ceiling-mounted air diffusers (Picture and ducted bac k to AHUs via ceiling oar <br /> gall-mounted return vents (Picture . During the assessment it was determined that the AHU in <br /> the B-I 12 suite of offices was not operating. <br /> Occupants in the gym/training/locker room areas reported thermal discomfort as a result <br /> f the HVAC system being automatically deati t. by a timer. Unlike typical classrooms, the <br /> gym/training/locker room areas are used after school hours involving various activities. Due to <br /> the potential for a large number of occupants .g., spectators fors rtin events) and water <br /> vapor/odors ger r ted in locker rooms, the mechanical ventilation should be overatina in these <br /> areas when the gym is occupied. Without fresh air supply and removal by the mechanical <br /> ventilation system, normally occurring environmental pollutants can build up and lead to indoor <br /> air/comfort complaints. <br /> The HVAC system for the Art/Pottery/Photography classrooms is also on a timer. As a <br /> result, supply/exhaust systems to these areas are cycled ofd'at the end of the school day. Given <br /> the products e.g., clay, photography developing chemicals) used and the materials e.g., dust, <br /> odors)generated in these areas, HVAC systems should be allowed to operate for an extended <br /> period following after school hours to allow for dilution and removal ofpollutants. <br />