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SAN JOAQUIN DELTA COLLEGE <br /> An Industrial air Quality (IAQ) profile is a description of the features of the building structure, function, and <br /> occupancy that impact indoor air quality <br /> Indoor air quality is not a simple, easily defined concept like a chair or a flat tire It is constantly changing interaction <br /> of a complex set of factors Four of the most important elements involved in the development of indoor air quality <br /> problems are <br /> 1 A source of odors or contaminants, <br /> 2 A problem with the design or operation of the HVAC system, <br /> 3 A pathway between the source and the location of the complaint and, <br /> 4 The building occupants <br /> The indoor environment in any building is a result of the interaction between the site, climate, building system <br /> (original design and later modifications in the structure and mechanical systems), construction techniques, <br /> contaminant sources (building materials and furnishings, moisture, processes and activities within the building, and <br /> outdoor sources), and building occupants <br /> Indoor air contaminants can originate within the building or be drawn in from outdoors If contaminant sources are <br /> not controlled, IAQ problems can arise, even if the HVAC system is properly designed and well-maintained It may <br /> be helpful to think of air pollutant sources as fitting into one of the following categories (the examples given are not <br /> intended to be a complete list) <br /> SOURCES OUTSIDE BUILDING <br /> Contaminated outdoor air <br /> pollen,dust, fungal spores <br /> industrial pollutants <br /> general vehicle exhaust <br /> Emissions from nearby sources <br /> exhaust from vehicles on nearby roads or in parking lots or garages <br /> loading docks <br /> odors from dumpsters <br /> re-entrained(drawn back into the building)exhaust from the building itself or from neighboring buildings <br /> unsanitary debris near the outdoor air intake <br /> Soli gas <br /> radon <br /> leakage from underground fuel tanks <br /> contaminants from previous uses of the site <br /> pesticides <br /> Moisture or standing water promoting excess microbial growth <br /> rooftops after rainfall <br /> crawlspace <br /> EQUIPMENT <br /> HVAC system <br /> dust or dirt in ductwork or other components <br /> microbiological growth in drip pans,humidifiers,ductwork, coil <br /> improper use of biocides, sealants, and/or cleaning compounds <br /> improper venting of combustion products <br /> refrigerant leakage <br /> Page #15 <br />