Practical learning assignments cover gas appliances and equipment installation, fuel gas piping systems, combustion and ventilation air chimneys and vents, gaseous hydrogen systems and other general requirements related to fuel gas systems. Features: 10 study sessions 250 total study questions with answer key. Applicable code text and code clarification. Helpful illustrations provide additional clarification of provisions. Great resource for Certification exams: Commercial Mechanical Inspector, Commercial Plumbing Inspector, Mechanical Plans Examiner, Plumbing Plans Examiner.