This is HVAC EPA 608 Core Exam and has 60 questions with explained answers. This exam covers Ozone delpletion, Clean Air Act and Montreal Protocol, Section 608 Regulations, Substitute Refrigerants and oils, Refrigeration, Three R’s, Recovery Techniques, Dehydration Evacuation, Safety and Shipping. This practice exam has been designed for anyone looking to pass the official exams and looking for become a licensed EPA 608 Certification Technician in US.