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Hazard Class <br />•NFPA 1142, Chapter 5, classifies property <br />uses into hazard classes ranging from 7 <br />(lowest risk—examples: residential, schools, <br />office buildings) to 3 (highest risk—examples: <br />flour mill, sawmill) <br />•The fire flow necessary for a structure <br />depending on the hazard class (higher risk = <br />greater fire flow). <br />17 <br />