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I <br /> of particulates (including P1 2. can be t higher levels than those measured outdoors. A <br /> number of mechanical devices and/or activities that occur indoors can generate particulate during <br /> normal operations. Sources of indoor airborne particulates nay include but are not limited to <br /> particles generated during the operation of fan belts in the HVAC system, use of stoves and/or <br /> microwave overs in kitchen areas; use of photocopiers, fax machines and computer printing <br /> devices; operation of an ordinary vacuum cleaner and heavy foot traffic indoors. <br /> Two kilns were observed in the C ging of the school. A hood style and dedicated <br /> exhaust were observed for the kilns.. t the time of assessment, the flexible ductwork for the <br /> dedicated exhaust was not attached to the kiln, which was operating at the time of assessment <br /> (Picture . While the hood exhaust can remove latent heat and dust expelled by the kiln, a <br /> dedicated system can capture these materials more effectively, especially since the second lila <br /> was not located directly below the hood. <br /> Volatile Organic Compounds <br /> Indoor air quality can also be negatively influenced by the presence of materials <br /> containing volatile organic compounds (VOCs). VOCs are carbon-containing substances that <br /> have the ability to evaporate at room temperature. Frequently, exposure to low levels of total <br /> VOCs TV Cs may produce eye, nose, throat and/or respiratory irritation in some sensitive <br /> individuals. For example, chemicals evaporating from a paint can.stored at room temperature <br /> would most likely contain VOCs. In an effort to identify materials that can potentially increase <br /> indoor V C concentrations, 1 PH IAQ staff`examined classrooms and common areas for <br /> products containing these respiratory irritants. <br /> The majority of classrooms contained dry erase boards and related materials. Materials <br /> such as dry erase markers and dry erase board cleaners may contain VOCs, such as methyl <br /> 14 <br />