Indoor Air Quality (IAQ)
Mechanical systems must address occupants' need for clean, fresh air at all times. Unlike conventional construction, which often recirculates pollutants and toxic fumes, high-performance buildings minimize pollutants at the source and continuously clean and condition the air.
Poor IAQ has been linked to sick building syndrome and associated building-related illnesses. Conversely, a building designed for good indoor air quality creates a safe and productive indoor environment.
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Minimize or eliminate the impact of exterior sources of pollution. Keep engine exhaust, wood smoke, pollen, trash odors, industrial pollution and other contaminants out of the building. Consider source location relative to air intakes, doors and operable windows. Be aware of prevailing winds and other environmental conditions that carry pollution.
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Minimize or eliminate interior sources of air pollution. Select stable or recycled materials that do not contain harmful chemicals or contaminants, such as volatile organic compounds (VOC). Eliminate construction adhesives, paints, stains, sealants and carpet systems with harmful materials.
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Scrutinize materials for their ability to act as a pollutant absorber or "sink." Porous materials, such as carpet and fabrics, can absorb interior pollutants and release them over time.
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Control pollution linked to the building’s ongoing operation and maintenance. Routine application of cleaning products, floor wax and wax strippers, disinfectants, herbicides and pesticides, carpet shampoo and detergents often contribute to indoor pollution. Alternatives exist toxic materials and practices.
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Ventilate for pollution removal. Effective ventilation provides fresh air for building occupants and filters out pollutants from circulation. Ventilation levels should respond to varying occupancy levels in the building. Filters are an important part of any ventilation system. Periodic filter cleaning or replacement ensures the system properly removes impurities.
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