The untreated portion of gas piping outlets must extend a minimum of how many inches through a wall?

Prepare for the HVAC D-2 License Exam. Study with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get ready for your HVAC certification!

Multiple Choice

The untreated portion of gas piping outlets must extend a minimum of how many inches through a wall?

Explanation:
Gas piping that passes through a wall should extend at least one inch beyond the wall surface. This small extension allows room to seal the penetration properly and keep the pipe accessible for inspection and maintenance. It also helps prevent water, dirt, or pests from entering the wall cavity and protects the pipe from potential surface damage. Extending more than one inch isn’t required by this standard, so one inch is the correct minimum.

Gas piping that passes through a wall should extend at least one inch beyond the wall surface. This small extension allows room to seal the penetration properly and keep the pipe accessible for inspection and maintenance. It also helps prevent water, dirt, or pests from entering the wall cavity and protects the pipe from potential surface damage. Extending more than one inch isn’t required by this standard, so one inch is the correct minimum.

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