Multiple-choice practice questions on meters, regulators, venting, combustion air, leak
investigation and more — each with the answer explained and the episode that teaches it. Your progress saves on this device.
By Topic
Training use only — not a code substitute. Questions are for study and self-check. Always rely on the current
NFPA 54 (2024) text and tables, the appliance manufacturer's instructions, your AHJ, and your employer's procedures.
This tool is independent and not affiliated with any utility. If you smell gas: leave the building, then call 911 and your gas utility from outside.