Unit 6 – Exception and ExemptionsBy Admin / November 27, 2014 March 21, 2018 You must first complete Unit 1 – Introduction to WHMIS before viewing this LessonPlease sign up for the course before starting the lesson. In this final unit participants will learn about the exceptions and exemptions to WHMIS. Unit 5 - Worker Training and Education Back to: Workplace Hazardous Material Information System (WHMIS)