Let’s use a fictional blower-door test as an example of how much information CFM50 can supply. I’ve calculated a home’s volume at 15,000 cubic feet, 4600 square feet of surface area, and the blower door measures 1000 CFM at the test pressure of 50 pascals. Using a Blower-Door Test and Interpreting the Results An introduction to the technology and calculations for measuring a home’s energy performance By Randy Williams | February 4, 2021 I’ve talked about blower-door testing several times on Green Building Advisor and on my blog, Northern Built. What is a blower door test? What's the cost? How do you find a company to do one? Guides Walls and Roofs Air and vapour barriers A blower door test identifies air leakage in a home; you can find and fix those air leaks for a more airtight, mold & rot-free and energy-efficient sustainable green home. Ecohome Updated: May 29, 2021 Mike Reynolds ZOp7.