EPA 608 Study Material 4 (Universal)

This is a study material audio recording that starts with 11 questions on refrigerant type and ASHRAE safety categories, then goes through 65+ questions from every portion of the EPA 608 certification tests, but with more of a focus on type 3. You can take the 25 question ESCO practice exams at: https://escogroup.org/practice/default.aspx