What is the purpose of a blower door test?

The purpose of a blower door test is to measure the air leakage of a building. This test helps determine how much air escapes from the building's envelope, which is crucial for understanding energy efficiency and comfort levels. By pressurizing or depressurizing the building with a fan, the test identifies points of air leakage, allowing for targeted improvements in insulation and sealing. Reducing air leaks can enhance energy performance, as it minimizes the loss of conditioned air, leading to lower heating and cooling costs and improved indoor comfort. Understanding the air leakage can also inform necessary repairs and upgrades to ensure that the building operates at optimal energy efficiency.