What is the minimum fuel gas appliance outlet size commonly required by fuel gas codes?

The minimum fuel gas appliance outlet size commonly required by fuel gas codes is typically 1/2 inch. This size has been established as a standard for many residential and some commercial applications, providing an adequate flow rate for most common appliances such as ovens, furnaces, and water heaters. A 1/2 inch outlet ensures that there is enough gas supply to meet the operational demands while also maintaining safety standards.

In many jurisdictions, the adoption of code provisions has standardized this minimum size. It's important to note that certain appliances may have specific requirements for larger outlets due to their higher consumption rates, but the 1/2 inch size remains a baseline which covers a wide range of standard installations. This ensures that installations remain cost-effective while providing efficient fuel delivery.