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BPI Written Exam - Section 3 Measurement & Verification of Building Performance
1. Application of Measured Air Leakage Test Results
Air leakage is reported in CFM50, or cubic feet per minute (a flow rate) at 50 Pascals. Air leakage results should be compared to the Minimum Ventilation Requirements (MVR) according to BPI Standards and set by ASHRAE 62.2 to tell if the home is too tight or can be safely air sealed and by how much.
Using a blower door, we can set a pressure differential between inside and outside. Once the home has been set up for blower door operation and the fan is up and running, we can easily find the location of air leakages with the following tools.