Testing ducts for leaks outside the thermal envelope with a Duct Blaster - Building Science Series

This community education lesson is part of our Building Science Series. If you are interested in learning more we hope you consider visiting our e-learning portal at buildwrightacademy.online and enrolling in our free Ventilation course.
The Building Science Series includes lessons about Air Leakage and Measuring with a Blower Door, Total Duct Leakage, Duct Leakage to the Outside, and a short lesson about Spot Ventilation.

[@stevohnalvarado838]

Hello I have a question. If there are supply leaks outside the thermal envelope will it pressurize the house ? And if there are return leaks outside the thermal envelope will the house be depressurized ? I’ve been study for my Raters exam and this was on one of my study sheets .. I feel these are wrong and it’s vice versa actually. Thanks I would appreciate the help

[@ConstructionEd]

Be careful - the scenarios we talk about in this video are about air movement when in the testing conditions only - this is not about standard operations.