A ventilation system will maintain overall indoor-air quality. A basic ventilation system expels stale air (containing water vapour, carbon dioxide, airborne chemicals and other pollutants), draws in outside air (containing fewer pollutants and less water vapour), and distributes outside air throughout the house.
There are two elements in a basic ventilation system:
A fan to extract stale air. Pick-up points for stale air are generally in high moisture areas, such as the kitchen, utility and bathrooms.
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