A single-page article. As technology changes, we have to keep in mind that not all things are created equal, especially when it comes to blower doors. A problem with exaggerated blower door test results by one agency was the first indication that something wasn’t quite right. All of Pennsylvania’s Weatherization agencies have upgraded to the Minneapolis Model 3. But evidently, there are still a number of older Model 2 Blower Doors in use today. Conflicting blower door data will result when using Model 3 gauges with a Model 2 Door. The difference lies in how the two models were calibrated at the factory and how the two different fans are configured during a test.