What code most commonly regulates commercial mechanical systems?

The International Mechanical Code (IMC) is the most widely adopted code for regulating commercial mechanical systems. It provides comprehensive guidelines and requirements specifically related to the design, installation, and maintenance of mechanical systems in commercial buildings. The IMC covers various aspects, including ventilation, heating, cooling, refrigeration, and exhaust among other mechanical systems, ensuring that they are safe, efficient, and effective.

The adoption of the IMC is largely due to its alignment with modern engineering practices and technologies, which helps ensure consistency and safety across different jurisdictions. Moreover, it is recognized by many states and municipalities, providing a standard that builders and contractors can rely upon.

In contrast, the International Plumbing Code (IPC) primarily addresses plumbing systems, the National Electrical Code (NEC) focuses on electrical installations, and the Uniform Mechanical Code (UMC) serves as another standard for mechanical systems but is less commonly adopted than the IMC. Thus, the IMC stands out as the main code that governs the wide range of requirements for commercial mechanical systems.