Relief vents should usually be located at least how many inches away from any opening?

The correct distance for relief vents to be located from any opening is 18 inches. This requirement is based on safety regulations that are designed to prevent potential hazards associated with the escape of gas or vapor from relief vents. Placing the vent 18 inches away from openings such as doors, windows, or air intakes ensures that any escaping gas is less likely to enter enclosed spaces, where it could pose a risk of explosion, asphyxiation, or other dangerous situations.

This distance is part of a broader framework of codes and standards aimed at ensuring the safe installation and operation of gas piping systems. It reflects a consideration of both the risks associated with gas leaks and the practicality of vent location in various building designs. Therefore, adhering to the 18-inch guideline is crucial for maintaining safe gas handling practices and protecting building occupants.