What type of hazard requires a sprinkler system to be designed for extra hazard conditions?

In the context of fire safety and sprinkler system design, extra hazard conditions require special consideration and design features to effectively manage the risk of fire. Industrial facilities with flammable materials are classified as extra hazard because they contain substances that can ignite easily and burn rapidly, posing a greater threat to life and property.

Sprinkler systems in these environments must be engineered to deliver a higher density of water or employ specialized nozzles for improved coverage to combat intense fires, which may develop due to the presence of volatile substances. The design may also incorporate features such as quicker response times and enhanced water supply capabilities to address the increased fire load and potential for fire spread in industrial settings.

Other environments, such as residential homes, office buildings, and low hazard storage areas, do not require the same level of protection because they either have lower fire risks or the types of materials stored or used do not contribute to high fire hazards. Therefore, the design and installation requirements for sprinkler systems vary significantly based on the hazard classification, making the requirement for extra hazard conditions in industrial facilities the correct answer.