What is the diameter of the gas line to the range/oven and fryers at Wendy's?

The diameter of the gas line to the range/oven and fryers in a commercial kitchen like Wendy's is typically designed to ensure that there is sufficient gas flow to meet the equipment's demands. In this case, a 1.5-inch diameter gas line is appropriate because it strikes a balance between providing adequate gas pressure and volume while still being manageable for installation and maintenance.

A 1.5-inch gas line efficiently supports a range and fryer, which both require a substantial amount of gas to operate effectively. Using a smaller diameter could result in insufficient gas supply, leading to poor performance of the kitchen equipment. Meanwhile, larger diameters, while potentially capable of handling high demand, can be less efficient and more expensive to install and maintain than necessary for the type of commercial cooking equipment typically found in a franchise operation. This makes the choice of a 1.5-inch diameter line optimal for the purposes outlined in the question.