Mechanicals · definition
Fuel gas piping (black iron or flexible CSST). Adding a range, pro cooktop, tankless heater, or fireplace often requires sizing/extending it.
Source: CSST Safety — Corrugated Stainless Steel Tubing
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.