It is not always possible or feasible to control all indoor pollutant sources. Therefore, it is often necessary to reduce the pollutants by diluting them with outside air. This process of ventilation, the second strategy for reducing indoor air pollution, is commonly achieved in residences by opening windows and doors, and turning on kitchen and bathroom exhaust fans and mechanical ventilation systems. The reality of the ventilation strategy in residences, however, is that open windows are not always feasible given weather conditions, and kitchen and bathroom exhausts are often noisy, ineffective, and are seldom used as a result.
The problem of exchanging stale air with fresh air has become more serious as houses continue to be constructed with less leaks - and homeowners seal and insulate to conserve energy. Other countries, including Canada, have enacted regulations to require homes to have a mechanical air exchange unit. U.S. codes require air exchanges in buildings, but not in homes. Yet, an increasing number of U.S. homeowners are opting for air exchange units, especially in new and renovated homes, and in homes where air quality is a priority.
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