Hangers and brackets used in mechanical installations must be of what type?

Hangers and brackets used in mechanical installations must be made of noncombustible materials to ensure safety and compliance with building codes. Noncombustible materials do not ignite or contribute to the spread of fire, making them essential for maintaining the structural integrity and safety of installations, especially in areas that are subject to high temperatures or exposure to flames.

By requiring these components to be noncombustible, the code helps reduce the risk of fire hazards associated with mechanical systems, thus promoting a safer environment in both residential and commercial settings. The use of noncombustible materials also ensures durability and performance over time, as they are generally better suited to withstand the stresses encountered in mechanical systems compared to materials that could potentially degrade or compromise safety during a fire incident.