Tim Carter, of http://go.askthebuilder.com/NewsletterSignupNow, demonstrates how to get fresh air into your home. Furnaces, gas water heaters, exhaust fans, etc. push air from houses, and it must be replaced.

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Discover more about fresh air supply at askthebuilder.com: 
http://www.askthebuilder.com/fresh-air-intake-vents/
http://www.askthebuilder.com/hvac-return-air-ducting/