The Online Envelope and Duct Leakage Testing course is an introduction to the causes and solutions to duct and home envelope leakage. Envelope and duct leakage testing is at the heart of home performance work. To be able to correct these problems, students must understand why they happen, how to find the leaks, and the proper way to seal them. This course will get you started on that path. This 2-hour course is delivered via our Learning Management System, Athena.