Building Envelope and Duct Testing Day 1; Building Energy Science, Building Performance Made Practical; MI-BEST® (Mobile Integrated Building Energy Science Training) Day 1 is the first of 5 consecutive days of training which are designed to be covered in sequence. Students are encouraged to stay for the entire 5 days, but may sign up for individual days depending on the agenda. Day 1 covers Basic Building Science and Energy Principles, and hands on practice with blower doors and duct testers using the MI-BEST portable training unit.