Understanding, measuring and diagnosing air leakage of the duct systems and the building shell is the focus of this training course. The air distribution system and the home envelope are described and investigated along with their impacts on efficiency, safety and building durability.  Tools and methods for measuring duct and air leakage and duct and air leakage calculations are explained. Discussions and examples include pressure influences and pressure diagnostics.  This course is an excellent introduction to residential duct and air leakage for anyone considering performing this type of testing and diagnostics; or anyone who will be approving and overseeing others to perform this type of work.