A blower door is a diagnostic tool designed to measure the air tightness of buildings to help locate air leakage areas. A blower door consists of a calibrated fan for measuring an airflow rate, and a pressure-sensing device to measure the air pressure created by the fan. The combination of pressure and fan-flow measurements is used to determine the building’s air tightness. The air tightness of a building is useful knowledge when trying to increase energy conservation, decrease indoor air pollution, or control building pressures.

     A basic blower-door system includes three components: a calibrated fan, a door-panel system, and a device to measure fan flow and … more