Natural ventilation depends on a home's airtightness, outdoor temperatures, wind, and other factors. Natural ventilation is unpredictable and uncontrollable-you can't rely on it to ventilate a house uniformly. Opening windows and doors also provides natural ventilation, but many people keep their homes closed up because they use central heating and cooling systems year-round. Today, we are sealing those cracks and holes to make our homes more energy-efficient, and after a home is properly air sealed, ventilation is necessary to maintain a healthy and comfortable indoor environment. In the past, this air leakage usually diluted air pollutants enough to maintain adequate indoor air quality. Natural ventilation is the uncontrolled air movement in and out of the cracks and small holes in a home.
There are three basic ventilation options -natural ventilation, spot ventilation, and whole-house ventilation. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) specifies how a home's living area should be ventilated in ASHRAE Standard 62.2. Different households have different occupancy levels (people and pets), schedules, activities, health concerns, and other preferences that will influence appropriate ventilation systems and operation. Ventilation also helps control moisture, thus reducing the chances of mold growth and structural damage. Ventilation is very important in an energy-efficient home. The “appropriate” amount and type of ventilation varies from home to home and from occupant to occupant.
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