Field Decision Trees

Walk a call step by step. Answer each question and the tree takes you to the right action — grounded in NFPA 54 (2024) and, for leak survey/grading, the GPTC / 49 CFR 192 framework. A teaching aid for the sequence, not a replacement for judgment, the code, or your procedures.

Teaching aid — not a code substitute. These flows simplify real decisions; always follow the current NFPA 54 (2024), 49 CFR 192 / GPTC (leak survey & grading), the appliance manufacturer's instructions, your AHJ, and your employer's written procedures. On any suspected hazardous leak or CO event: protect life first — evacuate, avoid ignition sources, and call the emergency line / 911. Independent; not affiliated with any utility.