CAZ Energy Services: Blower door test

During a blower door test, a fan installed in the front door pulls air out of the house, creating a slight vacuum.  The amount of air that flows through the fan is measured in cubic feet per minute, and is compared to a mathematical model of the house to determine whether the home should be air sealed or not.  During this test, an auditor can use a thermal camera to pinpoint air leaks in the home.

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