(30 minutes) Air movement in a home is a very complex topic. It includes air leakage, ventilation, and air circulation. This micro course explores the pressure sources that drive air leakage and air circulation. The course also discusses ventilation, which includes attic ventilation, crawlspace ventilation, and whole house ventilation. Ventilation is the most challenging topic in the short video. Study the topics and subtopics on the white-board illustration so that you can answer the exam questions correctly.