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Today, the healthy home exchanges about 1/3 of the air inside with outside air. That is the optimum rate of air infiltration. 
In older homes built during times of low energy costs, outdoor air replaced indoor air every 30 to 40 minutes. In tightly constructed homes, it takes 10 hours for air exchange to take place. An air exchanger improves indoor air 
quality by regularly exchanging and filtering outdoor and indoor air. In doing so, air exchangers reduce the levels of airborne chemicals, gases and particles. Chemicals come from building materials, upholstery, cleaning and personal care products, hobbies and cooking. Gases come from older gas-burning furnaces and appliances, which can leak and produce carbon dioxide and carbon monoxide from incomplete combustion. Human metabolic processes also produce carbon dioxide, ammonia, organic substances and odors. Particles such as pet dander, tobacco smoke and dust contribute to poor indoor air quality and related health issues such as colds, allergies and lung disease.

Read more: What Is an Air Exchanger? | eHow.com http://www.ehow.com/info_8562901_air-exchanger.html#ixzz297I7HiYD
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