The operating temperature limit in a smoke control system shall not exceed which of the following?

In a smoke control system, the operating temperature limit is crucial for ensuring the safety and effectiveness of the system during a fire. The correct limit is 350 degrees Fahrenheit. This temperature is established as part of safety protocols to prevent the overheating of materials, protect equipment, and ensure the reliability of the smoke control system.

Engineering standards and codes, such as the International Mechanical Code and local amendments, dictate that smoke control systems must operate effectively during a fire, which includes maintaining structural integrity and functionality at elevated temperatures. While options like 300, 400, and 250 degrees may seem reasonable, they do not align with the established safety thresholds for effective smoke control operations as detailed in the North Carolina Mechanical Code. Thus, 350 degrees stands as the maximum operating temperature limit to ensure safety and compliance with the code requirements.