A whole house ventilation system is a system designed to remove stale air from a home and bring in fresh air from outside by ventilating the home. Many builders and homeowners choose to build tightly sealed homes without "leaks" that would allow air in and out. Sealing a house tightly to prevent air from entering or leaving is often preferred because of the need to heat and cool homes: No homeowner wants air conditioning or heat escaping through gaps near windows or walls.
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A tightly sealed home can create problems with indoor air quality (IAQ), however. Toxins, pollutants, bacteria, and odors are unable to escape the home, and fresh outdoor air is unable to enter. As a result, the air inside the sealed home becomes stale and, in some cases, unhealthy. A whole house ventilation system is used to allow a house to be tightly sealed and free of drafts, while still ensuring proper circulation so fresh air can enter the home and stale air can leave.
According to the American Society of Heating, Refrigeration and Air Conditioning Engineering (ASHRAE), the air within a home should change .35 times per hour, or at least 15 cubic feet (.4 cubic meters) of new air should enter the home each minute for each person present.
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Kitchens and bathrooms are recommended to have even higher air turnover, up to the rate of 100 changes per minute, often achieved by the use of an exhaust fan. These "changes" require outdoor air to be able to enter a room, either through an window, a door, a fan, a window air conditioner, or a whole house ventilation system.
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