Blower door testing is a process used to assess the effectiveness of a building’s air barrier system, which is crucial for controlling the flow of air into and out of a structure. The goal is to ensure that the building envelope is properly sealed, minimizing energy loss and preventing drafts, moisture infiltration, and other issues that can lead to poor indoor air quality and increased energy consumption. During the test, specialized equipment is used to pressurize or depressurize the building, allowing inspectors to detect any leaks or weaknesses in the air barrier. This testing helps ensure compliance with building codes and energy efficiency standards, contributing to a more comfortable and sustainable building environment.