What must MFR identify when specifying plastic joints on a forced mechanical draft system?

In specifying plastic joints for a forced mechanical draft system, it is crucial for the Mechanical Facility Representative (MFR) to identify the exact plastic to be used. This is because different plastics have distinct properties that impact their performance, durability, and compatibility with the system's operational conditions. For instance, certain plastics may withstand higher temperatures, resist specific chemicals, or offer better structural integrity. The choice of material must ensure that it can effectively handle the physical and chemical stresses it will encounter in the mechanical draft system.

While factors such as the dimensions of the joints, installation method, and building color may be relevant in broader construction or design contexts, they do not directly address the material properties that are critical for the reliability and efficiency of the plastic joints in the system. Therefore, identifying the exact plastic is fundamental for ensuring long-term functionality and safety in mechanical draft systems.