Which code regulates piping materials that are exposed in plenums?

The International Mechanical Code (IMC) regulates piping materials that are exposed in plenums. Plenums are spaces used for air circulation in heating, ventilation, and air conditioning (HVAC) systems and are critical to ensuring safe and efficient airflow within buildings.

The IMC specifically addresses the materials and methods of installation for various types of mechanical systems, including those involving critical areas like plenums. This means that the code outlines the specifications for piping, indicating which materials are acceptable and safe to use in these areas to prevent potential hazards, including fire risk and the release of harmful substances.

By adhering to the guidelines established by the IMC, plumbers and HVAC professionals ensure compliance with safety standards that protect building occupants and the integrity of the building's air distribution system.