A blower door test is a machine used to calculate airflow between the interior and exterior of a structure, measure the airtightness of buildings, and identify spots where air is leaking through a building envelope. This test ensures a certain level of energy performance and is often used when a project team is aiming for a performance-based building standard like Passive House, which requires a blower door test result of less than 0.6 air changes per hour at 50 pascals of pressure (ACH 50).
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