Blower door testing measures how much air leaks into or out of a building. A powerful fan temporarily mounted in an exterior door changes indoor air pressure to identify drafts, air leaks, and weak points in the building envelope. The test helps improve energy efficiency, comfort, and indoor air quality by pinpointing areas that need sealing.
A blower door test is a powerful diagnostic tool used to analyze and identify energy loss within a building. The test uses a high-capacity fan that is temporarily mounted into an exterior doorway of the home. When the fan is activated, it depressurizes the building, allowing professionals to measure the amount of air leakage in cubic feet per minute (CFM). A qualified energy professional can then calculate the appropriate target CFM for your specific home.
During a blower door test, escaping air can be physically felt through gaps and leaks in the building’s exterior envelope. In many cases, homeowners can feel these air leaks by hand while the fan is operating, making problem areas easy to identify.
Our team uses blower door testing to locate weak points in your building envelope and establish a baseline for recommended improvements. These results help guide effective repairs that improve energy efficiency, comfort, and overall building performance.
Your home energy professional will perform the blower door test, including a walk-through of your home, setting up the blower door, and conducting the test. The following steps will help prepare your home for a blower door test:
