639 Louisiana (New Orleans) Second Class Stationary Refrigeration Certification Exam

639 Louisiana (New Orleans) Second Class Stationary Refrigeration The 639 Louisiana exam covers mechanical systems where ammonia or synthetic refrigerants circulate through fixed industrial equipment—think food storage warehouses or beverage distribution centers. Before test day, ensure you understand pressure vessels, compressor types, and safety relief valve calculations specific to stationary installations. Familiarity with Louisiana’s licensing statutes and EPA Section 608 certification requirements will strengthen your score significantly.