On this episode of "Shop Class," the teams are challenged with designing and putting their own unique take on the ultimate, tough as nails, Little Free Libraries. All across the country Little Free Libraries enhance communities and encourage reading, but rain, wind, and other harsh conditions often take their toll. So, it's up to the teams to design and build a library that looks great and is durable, to protect the books inside. After three full days of designing and building, Justin puts the teams' libraries to the test by introducing them to his biggest fan, an actual big fan that is capable of 100 MPH wind, and other harsh conditions. Three teams compete but only one team will earn a spot in the semi-finals and be one step closer to the championship, the title of "Shop Class" Champs, and an epic grand prize.