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In Class 3 - Noncombustible structures, the primary requirement is that the construction is made of noncombustible materials for walls, floors, and roofs. This classification is crucial in fire safety as noncombustible materials are those that do not ignite, burn, or release flammable vapors. The use of materials such as concrete, stone, metal, and glass enhances the fire resistance of the structure, reducing the risk of fire spread and providing safer environments for occupants.

This approach aligns with building regulations and fire codes that aim to minimize fire hazards. By ensuring all critical components of the building envelope are constructed from noncombustible materials, the structure can withstand higher temperatures without compromising its integrity.

In this context, other options fall short as they either exclusively focus on specific materials that do not meet the noncombustibility requirement or inaccurately combine combustible materials, which could pose significant fire risks. Thus, the emphasis on noncombustible materials across all structural elements is what defines Class 3 construction.