What is the maximum distance from a gas appliance that the shut off valve may be located?

The correct distance for a shut-off valve from a gas appliance is 3 feet. This requirement is set to ensure safety and accessibility. A shut-off valve located within this distance allows for quick access in case of an emergency, such as a gas leak. The 3-foot rule aims to minimize the risk associated with gas appliances by ensuring the valve is reachable without the need for moving other appliances or equipment, which could complicate swift action during a critical situation.

Additionally, having the valve within 3 feet helps conform to typical building codes and manufacturer guidelines, which emphasize both safety and ease of access. Regular practices in the plumbing industry prioritize minimizing the hazards of gas leaks by enforcing these kinds of accessibility standards for gas shut-off valves.

The other distances provided in the options either exceed or fall short of the safe recommendations. Hence, understanding the importance of the 3-foot requirement is crucial in ensuring compliance with safety measures in gas installations.