Term: Blower Door
A machine used to test the airtightness of buildings or of smaller spaces within buildings. A blower door is mounted in an opening such as a window or door and then uses a fan to pressurize or depressurize the measured space. The more airtight the space, the less air is needed from the blower door fan to create a change in air pressure.
Source: Building Science Corporation« Back to Glossary Index